研究者詳細 - 小橋　眞

PubMed

Machine learning surrogate modeling toward the design of lattice-structured heat sinks fabricated by additive manufacturing 査読有り

Asuka Suzuki, Hideto Nakatani, Makoto Kobashi

Materials & Design 230 巻頁： 111969 2023年6月

Mechanical coupling and tuned anisotropic elasticity: Numerical and experimental material design for shear-normal and shear-shear interactions 査読有り国際共著

Molavitabrizi, D; Suzuki, A; Kobashi, M; Mousavi, SM

MATERIALS & DESIGN 230 巻頁： 111950 2023年6月

Fabrication of Al-CNT composite with high hardness and electrical conductivity by controlling Al4C3 formation 査読有り

Kim, D; Hirayama, Y; Liu, Z; Takagi, K; Kobashi, M

JOURNAL OF ALLOYS AND COMPOUNDS 942 巻頁： 169102 2023年5月

B2-structured Fe<inf>3</inf>Al alloy manufactured by laser powder bed fusion: Processing, microstructure and mechanical performance 査読有り国際共著

A. M. Vilardell, L. Pelcastre, D. Nikas, P. Krakhmalev, M. Kato, N. Takata, M. Kobashi

Intermetallics 156 巻頁： 107849 2023年5月

担当区分：最終著者記述言語：英語掲載種別：研究論文（学術雑誌）

Prealloyed Fe3Al was successfully manufactured by laser powder bed fusion. The best set of process parameters led to parts with a relative density of 99.5 %, a surface roughness, Sa, of 31.5 ± 5.6 μm and a hardness of 319 ± 14 HV0.1. Its microstructure as well as its mechanical properties at room and high temperatures were analyzed. The results of the chemical composition showed minor variations in aluminum content oscillating between 21 and 28 at.% along the melt pool. Additionally, elongated grains were observed to grow parallel to the building direction, as well as the development of a weak {001} texture along the building direction. The mechanical properties were influenced by the temperature. Compression tests showed a loss in strength with the increase in temperature, from a yield strength of 621 ± 40 MPa at room temperature to 89 ± 20 MPa at 650 °C. Reciprocating sliding wear tests showed that fragmentation of the intermetallic at room temperature occurs, whereas plastic deformation dominated at higher temperatures. For all temperatures, tribochemical wear was also present due to the oxidation of wear debris.

DOI： 10.1016/j.intermet.2023.107849

Dual plateau stress of C15-type topologically close-packed lattice structures additive-manufactured by laser powder bed fusion 査読有り

Ultra-high coercivity Sm-Co bulk magnets with remarkable thermal stability 査読有り

Park, K; Hirayama, Y; Wang, J; Kobashi, M

SCRIPTA MATERIALIA 218 巻 2022年9月

Iron aluminides as an alternative binder for cemented carbides: A review and perspective towards additive manufacturing 査読有り国際共著

Vilardell, AM; Cinca, N; Tarres, E; Kobashi, M

MATERIALS TODAY COMMUNICATIONS 31 巻 2022年6月

Laser powder bed fusion of polyamide-composite for antibacterial applications: Characterization and properties 査読有り国際共著

Vilardell, AM; Yadroitsava, I; Wolf, WKC; Du Plessis, A; Tshibalanganda, M; Kouprianoff, DP; Garcia-Giralt, N; Kobashi, M; Yadroitsev, I

MATERIALS TODAY COMMUNICATIONS 31 巻 2022年6月

Exchange-Coupled SmCo5/Fe Nanocomposite Magnet Prepared by Low Oxygen Powder Metallurgy Process 査読有り

Park, K; Hirayama, Y; Yamaguchi, W; Kobashi, M; Takagi, K

IEEE TRANSACTIONS ON MAGNETICS 58 巻 ( 2 ) 2022年2月

Anisotropic Sm-Co nanopowder prepared by induction thermal plasma 査読有り

Park, K; Hirayama, Y; Shigeta, M; Liu, Z; Kobashi, M; Takagi, K

JOURNAL OF ALLOYS AND COMPOUNDS 882 巻頁： 160633 - 160633 2021年11月

Liu, XY; Suzuki, A; Takata, N; Kobashi, M; Kato, M

SCRIPTA MATERIALIA 202 巻 2021年9月

Highly Conductive Al/Al Interfaces in Ultrafine Grained Al Compact Prepared by Low Oxygen Powder Metallurgy Technique 査読有り

Kim, D; Hirayama, Y; Liu, Z; Kwon, H; Kobashi, M; Takagi, K

NANOMATERIALS 11 巻 ( 5 ) 2021年5月

Managing both high strength and thermal conductivity of a laser powder bed fused Al-2.5Fe binary alloy: Effect of annealing on microstructure 査読有り

Qi, X; Takata, N; Suzuki, A; Kobashi, M; Kato, M

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING 805 巻頁： 140591 2021年2月

Understanding and suppressing shear band formation in strut-based lattice structures manufactured by laser powder bed fusion

Liu Xiaoyang, Wada Takafumi, Suzuki Asuka, Takata Naoki, Kobashi Makoto, Kato Masaki

MATERIALS & DESIGN 199 巻 2021年2月

Understanding and suppressing shear band formation in strut-based lattice structures manufactured by laser powder bed fusion

Liu Xiaoyang, Wada Takafumi, Suzuki Asuka, Takata Naoki, Kobashi Makoto, Kato Masaki

MATERIALS & DESIGN 199 巻 2021年2月

Fabrication of Metal Matrix Composite Containing Manganese Nitride Showing Giant Negative Thermal Expansion by Compressive Torsion Processing 査読有り

Takenaka, K; Otsuka, K; Okamoto, Y; Kume, Y; Kobashi, M

MATERIALS TRANSACTIONS 62 巻 ( 5 ) 頁： 590 - 595 2021年

Induction-activated self-propagating, high-temperature synthesis of nickel aluminide

Shekari, M; Adeli, M; Khobzi, A; Kobashi, M; Kanetake, N

ADVANCED POWDER TECHNOLOGY 28 巻 ( 11 ) 頁： 2974 - 2979 2017年11月

Change in microstructure of selectively laser melted AlSi10Mg alloy with heat treatments

Takata, N; Kodaira, H; Sekizawa, K; Suzuki, A; Kobashi, M

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING 704 巻頁： 218 - 228 2017年9月

Compressive properties of porous Ti-Al alloys fabricated by reaction synthesis using a space holder powder

Takata, N; Uematsu, K; Kobashi, M

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING 697 巻頁： 66 - 70 2017年6月

Pressure-less melt infiltration characteristics of Mg melt into Ti powder preforms with various pore structures: Toward the application to the binder jetting additive manufacturing

Li, ZY; Suzuki, A; Takata, N; Kobashi, M

JOURNAL OF MATERIALS PROCESSING TECHNOLOGY 331 巻頁： 118509 - 118509 2024年10月

Enhancing Capillary Pressure of Porous Aluminum Wicks by Controlling Bi-Porous Structure Using Different-Sized NaCl Space Holders

Shen, HF; Suzuki, A; Takata, N; Kobashi, M

MATERIALS 17 巻 ( 19 ) 頁： 4729 - 4729 2024年10月

Variation in microstructural features of melt-pool structure in laser powder bed fused Al-Fe-Cu alloy at elevated temperatures

Cheng, Y; Miyawaki, T; Wang, WY; Takata, N; Suzuki, A; Kobashi, M; Kato, M

JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T 32 巻頁： 4048 - 4058 2024年9月

Thermal stability of refined Al 6 (Fe, Mn) phase formed in laser powder bed fusion process

Wang, WY; Xu, YF; Deguchi, M; Takata, N; Suzuki, A; Kobashi, M; Kato, M; Mitsuhara, M; Nakashima, H

JOURNAL OF ALLOYS AND COMPOUNDS 992 巻 2024年7月

Elucidating dominant flow channel size for capillary performance of open-cell porous wicks 査読有り

Shen, HF; Suzuki, A; Takata, N; Kobashi, M

INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER 223 巻頁： 125217 - 125217 2024年5月

Four-dimensional electrochemical impedance spectroscopy: Role of microstructure on corrosion behaviour of Al-Si alloys additive-manufactured by laser powder bed fusion 査読有り

Hoshi, Y; Miyazawa, R; Otani, Y; Kim, D; Takata, N; Kobashi, M

CORROSION SCIENCE 232 巻 2024年5月

Effect of Cr content on thermally activated deformation in single-crystal micropillars of Fe-Cr binary alloys 査読有り

Zhu, TQ; Takata, N; Kim, D; Kobashi, M; Yoshino, M; Tsukamura, M

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING 900 巻 2024年5月

In-Situ SEM Observation and DIC Strain Analysis for Deformation and Cracking of Hot-Dip ZnMgAl Alloy Coating 査読有り

Takata, N; Yokoi, H; Kim, D; Suzuki, A; Kobashi, M

CORROSION SCIENCE AND TECHNOLOGY-KOREA 23 巻 ( 2 ) 頁： 113 - 120 2024年4月

Microstructural origins of high strength of Al–Si alloy manufactured by laser powder bed fusion: In-situ synchrotron radiation X-ray diffraction approach 査読有り

Naoki Takata, Mulin Liu, Masahiro Hirata, Asuka Suzuki, Makoto Kobashi, Masaki Kato, Hiroki Adachi

Journal of Materials Science and Technology 178 巻頁： 80 - 89 2024年4月

記述言語：英語掲載種別：研究論文（学術雑誌）

The microstructural factors contributing to the high strength of additive-manufactured Al–Si alloys using laser-beam powder bed fusion (PBF-LB) were identified by in-situ synchrotron X-ray diffraction in tensile deformation and transmission electron microscopy. PBF-LB and heat treatment were employed to manufacture Al–12%Si binary alloy specimens with different microstructures. At an early stage of deformation prior to macroscopic yielding, stress was dominantly partitioned into the α-Al matrix, rather than the Si phase in all specimens. Highly concentrated Si solute (∼3%) in the α-Al matrix promoted the dynamic precipitation of nanoscale Si phase during loading, thereby increasing the yield strength. After macroscopic yielding, the partitioned stress in the Si phase monotonically increased in the strain-hardening regime with an increase in the dislocation density in the α-Al matrix. At a later stage of strain hardening, the flow curves of the partitioned stress in the Si phase yielded stress relaxation owing to plastic deformation. Therefore, Si-phase particles localized along the cell walls in the cellular-solidified microstructure play a significant role in dislocation obstacles for strain hardening. Compared with the results of the heat-treated specimens with different microstructural factors, the dominant strengthening factors of PBF-LB manufactured Al–Si alloys were discussed.

DOI： 10.1016/j.jmst.2023.08.050

Microstructural factors controlling crack resistance of Zn-Al-Mg alloy coatings prepared via hot-dip galvanizing process: Combined approach of in-situ SEM observation with digital image correlation analysis 査読有り

CALPHAD-aided design of high-strength Al-Si-Mg alloys for sufficient laser powder bed fusion processability 査読有り

Otani, Y; Saki, K; Takata, N; Suzuki, A; Kobashi, M; Kato, M

JOURNAL OF ALLOYS AND COMPOUNDS 977 巻頁： 173449 - 173449 2024年3月

Kim, D; Takata, N; Yokoi, H; Suzuki, A; Kobashi, M

JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T 29 巻頁： 1535 - 1541 2024年3月

Laser-beam powder bed fusion of Al-Fe-Cu alloy to achieve high strength and thermal conductivity 査読有り

Cheng, Y; Miyawaki, T; Wang, WY; Takata, N; Suzuki, A; Kobashi, M; Kato, M

ADDITIVE MANUFACTURING LETTERS 8 巻頁： 100191 2024年2月

Al-Si 合金中のSi 含有量による炭素繊維／溶湯界面の化合物制御査読有り

古川雄一, 冨田高嗣, 三輪拓海, 鈴木飛鳥, 高田尚記, 小橋眞

鋳造工学頁： 68 - 72 2024年2月

Austenite Reversion Behavior of Maraging Steel Additivemanufactured by Laser Powder Bed Fusion 査読有り

Takata, N; Ito, Y; Nishida, R; Suzuki, A; Kobashi, M; Kato, M

ISIJ INTERNATIONAL 64 巻 ( 2 ) 頁： 303 - 315 2024年

Combustion Foaming of Porous (Al, Fe)3Ti with L12 Ordered Structure

Suzuki, A; Fujishiro, T; Takata, N; Kobashi, M

MATERIALS TRANSACTIONS 65 巻 ( 4 ) 頁： 414 - 421 2024年

Evaluation of reactive wetting kinetics of carbon fibers by molten Al-Ti alloy and its application to the fabrication of Al/carbon fiber composites 査読有り

Suzuki, A; Ishiguro, R; Miwa, T; Takata, N; Kobashi, M; Furukawa, Y

JOURNAL OF ALLOYS AND COMPOUNDS 968 巻頁： 172168 2023年12月

Evaluation of reactive wetting kinetics of carbon fibers by molten Al-Ti alloy and its application to the fabrication of Al/carbon fiber composites

Suzuki, Asuka, Ishiguro, Renkichi, Miwa, Takumi, Takata, Naoki, Kobashi, Makoto, Furukawa, Yuichi

Journal of Alloys and Compounds 968 巻頁： 172168 2023年12月

記述言語：英語掲載種別：研究論文（学術雑誌）

Wetting and interfacial reactions between molten Al and carbon fibers (CFs) are crucial for the fabrication of high-thermal conductive Al/CF composites through liquid-state processes including casting. The formation of Al4C3 which has a low thermal conductivity and high reactivity with water needs to be suppressed while improving wettability. The addition of Ti into molten Al forms TiC and contributes to significant improvement in wettability. To control a thin morphology of TiC, the kinetics of reactive wetting need to be clarified. In the present study, the reactive wetting kinetics between molten Al or Al-Ti alloy and pitch-based CF were investigated using the dipping coverage method combined with microstructural observations. The addition of Ti into molten Al drastically accelerated the wetting and reduced the apparent activation barrier for reactive wetting, which was related to the change in the interfacial products from the Al4C3 phase to the TiC phase. The Al4C3 phase grew while eroding the CFs, whereas the TiC phase formed in a thin-layered morphology around CFs and suppressed the diameter reduction of CF. The reduction in the apparent activation barrier and the morphology of carbides indicated a change in the dominant phenomena for reactive wetting from Al4C3 growth to TiC formation (controlled by diffusion in liquid Al). Based on the kinetics evaluations, CF were hybridized with pure Al and Al-Ti alloy through a casting process, and their thermal conductivities were evaluated. The addition of CF into pure Al degraded the thermal conductivity due to the eroded CF and coarsened Al4C3 phase, whereas the addition of CF into Al-Ti alloy enhanced the thermal conductivity. This study provides new insights into reactive wetting phenomena related to the fabrication of high-thermal conductive metal matrix composites.

単結晶マイクロピラー圧縮試験を用いたAl-Fe合金積層造形体の高強度支配因子の検討査読有り

長子明弘, 朱天斉, 高田尚記, 鈴木飛鳥, 小橋眞

軽金属 73 巻 ( 11 ) 頁： 523 - 529 2023年11月

Wear properties of aluminum alloys fabricated by laser powder bed fusion 査読有り国際共著

Gong, S; Takata, N; Kobashi, M; Shin, SE

TRIBOLOGY INTERNATIONAL 187 巻頁： 108769 2023年9月

Design of Al-Fe-Mn alloy for both high-temperature strength and sufficient processability of laser powder bed fusion 査読有り

Wenyuan Wang, Naoki Takata, Asuka Suzuki, Makoto Kobashi, Masaki Kato

ADDITIVE MANUFACTURING 68 巻頁： 103524 2023年4月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：ELSEVIER

This paper presents a novel design concept for Al alloys with both sufficient laser powder bed fusion (L-PBF) processability and high-temperature mechanical performance using an Al-Fe-Mn ternary alloy with a refined alpha-Al/Al6M (M = Fe, Mn) two-phase microstructure. The near-eutectic (liquid -> alpha-Al(fcc) + Al6M) composition of Al-2.5Fe-2Mn (mass%) was designed to avoid the formation of coarse primary intermetallics (having a detrimental effect on the PBF processability for densification) based on non-equilibrium liquidus projection thermodynamic calculations. The designed Al-2.5Fe-2Mn alloy powder exhibited sufficient L-PBF processability, and fully dense centimeter-sized samples (relative densities of above 99%) were successfully prepared. The L-PBF Al-2.5Fe-2Mn alloy samples exhibited a significantly refined solidification microstructure consisting of Al6M and alpha-Al phases in the melt-pool regions. Fe and Mn alloying elements contributed to the formation of nanoscale Al6M-phase particles and a high solid solution concentration in the alpha-Al matrix. The strength of the L-PBF Al-2.5Fe-2Mn alloy was slightly reduced at higher temperatures, but remained above 240 MPa at an elevated temperature of 300 degrees C. This superior high-temperature mechanical performance was attributed to the high thermal stability of the refined alpha-Al/Al6M two-phase microstructure and the formation of nanosized Al6M-phase precipitates.

DOI： 10.1016/j.addma.2023.103524

Microstructural origin of anisotropic tensile ductility of Al-Si alloy manufactured by laser powder bed fusion 査読有り

Otani, Y; Takata, N; Suzuki, A; Kobashi, M; Kato, M

SCRIPTA MATERIALIA 226 巻 2023年3月

Austenite Reversion Behavior of Maraging Steel Additive-manufactured by Laser Powder Bed Fusion 査読有り

Naoki Takata, Yuya Ito, Ryoya Nishida, Asuka Suzuki, Makoto Kobashi, Masaki Kato

TETSU TO HAGANE-JOURNAL OF THE IRON AND STEEL INSTITUTE OF JAPAN 109 巻 ( 3 ) 頁： 201 - 214 2023年3月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：IRON STEEL INST JAPAN KEIDANREN KAIKAN

This study was set to fundamentally investigate the characteristics of austenite reversion occurring in maraging steels additive-manufactured by laser powder bed fusion (L-PBF). The maraging steel samples manufactured under different L-PBF process conditions (laser power P and scan speed v) were subjected to heat treatments at 550 degrees C for various durations, compared with the results of the austenitized and water-quenched sample with fully martensite structure. The L-PBF manufactured samples exhibited the martensite structure (including localized austenite (gamma) phases) containing submicron-sized cellular structures. Enriched alloy elements were detected along the cell boundaries, whereas such cellar structure was not found in the water-quenched sample. The localized alloy elements can be rationalized by the continuous variations in the gamma-phase composition in solidification during the L-PBF process. The precipitation of nanoscale intermetallic phases and the following austenitic reversion occurred in all of the experimental samples. The L-PBF manufactured samples exhibited faster kinetics of the precipitation and austenite reversion than the water-quenched sample at elevated temperatures. The kinetics changed depending on the L-PBF process condition. The enriched Ni element (for stabilizing gamma phase) localized at cell boundaries would play a role in the nucleation site for the formation of gamma phase at 550 degrees C, resulting in the enhanced austenite reversion in the L-PBF manufactured samples. The variation in the reaction kinetics depending on the L-PBF condition would be due to the varied thermal profiles of the manufactured samples by consecutive scanning laser irradiation operated under different P and v values.

DOI： 10.2355/tetsutohagane.TETSU-2022-066

Effects of Mn and Cu Additions on Solidification Microstructure and High-Temperature Strength of Cast AlFe Binary Alloy 査読有り

Naoki Okano, Naoki Takata, Asuka Suzuki, Makoto Kobashi

Materials Transactions 64 巻 ( 2 ) 頁： 492 - 499 2023年

担当区分：最終著者記述言語：英語掲載種別：研究論文（学術雑誌）

In order to investigate the effects of Mn and Cu additions on solidification microstructure and high-temperature strength of cast AlFe alloys, we have fabricated various AlFe-based alloys with compositions of Al1%Fe, Al1%Fe1%Mn, Al1%Fe1%Cu, and Al1%Fe1%Cu1%Mn (mol%) solidified at different cooling rates (0.3 K·s11 and 145 K·s11). In the Al1%Fe binary alloy, the coarsened ª-Al13Fe4 phase with a needle-shaped morphology was often observed in the furnace-cooled sample (0.3 K·s11), whereas the cast sample (145 K·s11) exhibited several elongated ¡ phases surrounded by fine ¡/Al6Fe eutectic microstructure. Such a solidification microstructure was observed in the cast Al1%Fe1%Cu alloy, whereas the Al23CuFe4 phase was locally formed in the finally solidified zone in the furnace-cooled sample. In the Al1%Fe1%Mn alloy, the Al6(Fe, Mn) phase was formed regardless of the cooling rate. Finer ¡/Al6(Fe, Mn) two-phase eutectic microstructure was almost entirely occupied in the cast sample. The fine eutectic microstructure was observed in the cast Al1%Fe1%Cu1%Mn alloy as well. Compression tests for cast alloy specimens revealed that the Al1%Fe1%Cu1%Mn alloy exhibited the highest strength level among the studied alloy specimens, indicating the combined addition of Mn and Cu elements could be effective in improving the high-temperature strength of the cast AlFe alloys.

DOI： 10.2320/matertrans.MT-LA2022010

Influence of Dislocation Substructure on Size-Dependent Strength of High-Purity Aluminum Single-Crystal Micro pillars 査読有り

Naoki Takata, Shintaro Uesugi, Tianqi Zhu, Socihiro Takeyasu, Asuka Suzuki, Makoto Kobashi

MATERIALS TRANSACTIONS 64 巻 ( 8 ) 頁： 1952 - 1958 2023年

担当区分：最終著者記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：JAPAN INST METALS & MATERIALS

In order to understand the influence of dislocation substructures on the size-dependent strength (smaller is stronger) of micron-sized metals, we have fabricated single-crystal cylindrical micropillars with various diameters approximately ranging from 1 to 10 mu m, which were prepared on the surface of the fully annealed sample and the subsequently cold-rolled samples of high-purity aluminum (Al). The annealed micropillars exhibited a size dependence of the resolved shear stress required for slip. The shear stress (tau(i)) normalized by shear modulus (G) and the specimen diameter (d) normalized by Burgers vector (b) followed the correlation of tau(i)/G=0.33(d/b)(-0.63). The size-dependent strength was reduced by cold-rolling, resulting in lower power-law exponents (0.26 similar to 0.31) for the correlation in the cold-rolled specimens. The fine dislocation substructures introduced by the cold-rolling could be associated with the reduced size-dependent strength, which can be rationalized using the stochastic model of the dislocation source length in an assumption of homogenously distributed dislocations existing in the experimental micropillars. The inhomogeneous dislocation substructure with various dislocation cell sizes would contribute to a variation in the measured strength depending on the location, likely due to the probability of exiting the dislocation cell walls (local variation in dislocation density) in the micropillars fabricated on the cold-rolled Al samples<bold>.</bold>

DOI： 10.2320/matertrans.MT-L2023004

Introducing Hatch Spacing into Deposited Energy Density toward Efficient Optimization of Laser Powder Bed Fusion Process Parameters 査読有り

Mai Kunieda, Asuka Suzuki, Naoki Takata, Masaki Kato, Makoto Kobashi

Materials Transactions 64 巻 ( 6 ) 頁： 1099 - 1106 2023年

担当区分：最終著者記述言語：英語掲載種別：研究論文（学術雑誌）

The optimization of processing parameters is indispensable for the laser powder bed fusion (L-PBF) process. The deposited energy density (DED) is one of the process indexes for the L-PBF process and has a simplified formula of P v 0.5, where P is the laser power, and v is the scan speed. This parameter describes the change in the relative density and the melt pool morphology with laser power and scan speed well, whereas it does not include the effect of other processing parameters, e.g., hatch spacing (S). In the present study, an attempt was made to incorporate the effect of S into DED. Al12Si (mass%) alloy cube samples were fabricated by L-PBF under various P, v, and S, for evaluating the relative density and the melt pool morphology. The melt pool depth and width of L-PBF-manufactured Al12Si alloy increased linearly with P v 0.5 and did not exhibit a clear correlation with S. Based on the experimental observation, the effect of hatch spacing on DED was estimated to be S 0.5, and a new index of P v 0.5 S 0.5 was proposed. This index described the change in the relative density of the L-PBF-manufactured Al12Si alloy with laser conditions (P, v, and S) well when the thermal conduction mode melting was dominant. This study also indicated the limitation of the applicability of P v 0.5 S 0.5 under the keyhole or transition mode melting.

DOI： 10.2320/matertrans.MT-ME2022002

Design of heat-resistant Al-Mg -Zn-Cu-Ni quinary alloy: Controlling intermetallic phases and mechanical performance at elevated temperature

Effect of solute Ni on thermal activation process of plastic deformation in Fe-18Cr single-crystal micropillars 査読有り

Zhu, TQ; Li, HM; Takata, N; Kobashi, M; Yoshino, M

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING 857 巻 2022年11月

Li, RQ; Takata, N; Suzuki, A; Kobashi, M

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING 857 巻 2022年11月

Machine-learning assisted optimization of process parameters for controlling the microstructure in a laser powder bed fused WC/Co cemented carbide 査読有り

Suzuki, A; Shiba, Y; Ibe, H; Takata, N; Kobashi, M

ADDITIVE MANUFACTURING 59 巻 2022年11月

レーザ粉末床溶融結合法によるAl-Si合金のレーザ条件最適化と組織・特性制御

鈴木飛鳥, 高田尚記, 小橋眞, 加藤正樹

粉体および粉末冶金 69 巻 ( 10 ) 頁： 417 - 425 2022年10月

Controllable tensile performance of additively manufactured Al-Fe alloy 査読有り

Qi, X; Takata, N; Suzuki, A; Kobashi, M; Kato, M

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING 855 巻 2022年10月

粉末冶金に基づく金属表面でのメゾ構造制御とその金属/樹脂接合への応用

鈴木飛鳥, 高田尚記, 小橋眞

粉体工学会誌 59 巻 ( 10 ) 頁： 511 - 517 2022年10月

Aluminum matrix composites reinforced with multi-walled carbon nanotubes and C60 manufactured by laser powder bed fusion 査読有り国際共著

Yoo, S; Shin, SE; Takata, N; Kobashi, M

JOURNAL OF MATERIALS SCIENCE 57 巻 ( 38 ) 頁： 17984 - 17999 2022年10月

Enhancing the solid-state joinability of A5052 and CFRTP via an additively manufactured micro-structure 査読有り

Iwata, K; Suzuki, A; Kim, SG; Takata, N; Kobashi, M

JOURNAL OF MATERIALS PROCESSING TECHNOLOGY 306 巻 2022年8月

Microstructural Variations in Laser Powder Bed Fused Al-15%Fe Alloy at Intermediate Temperatures 査読有り

Wang, WY; Takata, N; Suzuki, A; Kobashi, M; Kato, M

MATERIALS 15 巻 ( 13 ) 2022年7月

Fast scanning calorimetry study of Al alloy powder for understanding microstructural development in laser powder bed fusion 査読有り

Takata, N; Liu, ML; Li, HM; Suzuki, A; Kobashi, M

MATERIALS & DESIGN 219 巻 2022年7月

耐用温度300°Cを実現する鋳造アルミニウム共晶合金の設計と組織形態制御

高田尚記, 岡野直輝, 相川宗也, 岡野大幹, 鈴木飛鳥, 小橋眞

軽金属 72 巻 ( 6 ) 頁： 381 - 387 2022年6月

レーザ粉末床溶融結合法によるAl-10%Si-0.4%Mg合金積層造形体の特異的な熱伝導率のイメージベース有限要素解析

鈴木飛鳥, 宮坂達也, 高田尚記, 小橋眞

軽金属 72 巻 ( 5 ) 頁： 164 - 171 2022年5月

応力発光体を用いた積層造形Al-12%Si合金ラティス構造体の圧縮変形挙動の観察

加藤正樹, 鈴木飛鳥, Matthew Mcmillan, Xiaoyang Liu, 高田尚記, 小橋眞

軽金属 72 巻 ( 5 ) 頁： 246 - 250 2022年5月

Negative strain rate sensitivity of yield strength of Al-Si alloy additive-manufactured using laser powder bed fusion 査読有り

Takata, N; Liu, ML; Suzuki, A; Kobashi, M; Kato, M

SCRIPTA MATERIALIA 213 巻頁： 114635 - 114635 2022年5月

Novel approach in fabricating microchannel-structured La(Fe,Si)13Hy magnetic refrigerant via low-contamination route using dissolutive mold 査読有り

Imaizumi, K; Fujita, A; Suzuki, A; Kobashi, M; Ozaki, K

MATERIALS & DESIGN 217 巻頁： 110651 - 110651 2022年5月

Microstructure and magnetocaloric property of homogeneous La (FexSi1-x)13 compounds fabricated by laser fusion using a powder mixture of Fe and LaySiz compounds 査読有り

Imaizumi, K; Fujita, A; Suzuki, A; Kobashi, M; Ozaki, K

JOURNAL OF ALLOYS AND COMPOUNDS 901 巻頁： 163706 - 163706 2022年4月

Improvement of magnetocaloric effect in La(FexSi1-x)13 by dealing with inhibitory microstructures at high Fe concentration 査読有り

Imaizumi, K; Fujita, A; Suzuki, A; Kobashi, M; Ozaki, K

ACTA MATERIALIA 227 巻頁： 117726 - 117726 2022年4月

計算状態図を基にした耐熱アルミニウム鍛造合金の設計と組織制御査読有り

高田尚記, 鈴木飛鳥, 小橋眞

まてりあ 61 巻 ( 4 ) 頁： 195 - 201 2022年4月

High-temperature strength sustained by nano-sized eutectic structure of Al-Fe alloy manufactured by laser powder bed fusion 査読有り

Wang, WY; Takata, N; Suzuki, A; Kobashi, M; Kato, M

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING 838 巻頁： 142782 - 142782 2022年3月

Solidification microstructure and room-temperature fracture toughness of Al-based cast alloys prepared through eutectic reactions in Al-Mg-Zn ternary system

Naoki Okano, Motonari Aikawa, Naoki Takata, Asuka Suzuki, Makoto Kobashi

Journal of Japan Institute of Light Metals 72 巻 ( 3 ) 頁： 79 - 87 2022年3月

Change in microstructural characteristics of laser powder b e d fuse d Al-Fe binary alloy at elevated temperature 査読有り

Qi, X; Takata, N; Suzuki, A; Kobashi, M; Kato, M

JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY 97 巻頁： 38 - 53 2022年1月

Influence of Added Fourth Elements on Precipitation in Heat-Resistant Al-Mg-Zn Ternary Alloys 査読有り

Ishii, H; Takagi, R; Takata, N; Suzuki, A; Kobashi, M

MATERIALS TRANSACTIONS 63 巻 ( 4 ) 頁： 513 - 521 2022年

Effect of heat treatment on solute Si content in Al-12%Si alloy additive-manufactured by laser powder bed fusion

Naoki Takata, Mulin Liu, Asuka Suzuki, Makoto Kobashi, Masaki Kato, Shumpei Iwai, Hiroki Adachi

Keikinzoku/Journal of Japan Institute of Light Metals 72 巻 ( 5 ) 頁： 178 - 184 2022年

掲載種別：研究論文（学術雑誌）

We have investigated microstructural characteristics and solute Si element in the α-Al (fcc) matrix of Al-12%Si binary alloy additive-manufactured by laser powder bed fusion (L-PBF) process in terms of different locations in the melt-pool structure (inside melt-pool or around melt-pool boundaries). Their variations by post heat-treatments at various temperatures were examined. The fraction of Si phase and lattice parameter of α-Al phase were quantified by XRD measurements combined with sample rotation and oscillation systems. In the L-PBF manufactured sample, the columnar α -Al phases contained highly concentrated Si element in solution (above 3 mol%) inside melt-pools, whereas the measured Si content was approximately 2 mol% in the relatively coarsened α-Al phase along melt-pool boundaries. The location dependence of solute Si content would be associated with a continuous change in growth rate of solid phase in solidification by local heating in the L-PBF process. The solute Si content was significantly reduced by heat-treatments and its location dependence appeared less pronounced. The as-manufactured sample exhibited a lower lattice parameter of α-Al phase with concentrated Si in solution in comparison with the heat-treated samples. The fraction of Si phase became higher in the heat-treated samples. These results were rationalized by microstructural change at elevated temperatures.

DOI： 10.2464/jilm.72.178

Precipitation morphology and kinetics of T-Al6Mg11Zn11 intermetallic phase in Al-Mg-Zn ternary alloys 査読有り

金属積層造形のプロセスパラメータ最適化への機械学習の活用

鈴木飛鳥, 伊部博之, 高田尚記, 小橋眞, 加藤正樹

日本溶射学会誌溶射 59 巻 ( 4 ) 頁： 210 - 216 2022年

Takata, N; Takagi, R; Li, RQ; Ishii, H; Suzuki, A; Kobashi, M

INTERMETALLICS 139 巻頁： 107364 - 107364 2021年12月

Control of microstructural characteristics and mechanical properties of AlSi12 alloy by processing conditions of laser powder bed fusion 査読有り

Suzuki, A; Miyasaka, T; Takata, N; Kobashi, M; Kato, M

ADDITIVE MANUFACTURING 48 巻頁： 102383 2021年12月

Precipitation Hardening at Elevated Temperatures above 400 °C and Subsequent Natural Age Hardening of Commercial Al-Si-Cu Alloy 査読有り

Li, RQ; Takata, N; Suzuki, A; Kobashi, M; Okada, Y; Furukawa, Y

MATERIALS 14 巻 ( 23 ) 頁： 7155 - 7155 2021年12月

Enhancement in strength and ductility of laser powder bed fused Al-12Si alloy by introducing nanoscale precipitates

Liu, ML; Takata, N; Suzuki, A; Kobashi, M; Kato, M

ADDITIVE MANUFACTURING LETTERS 1 巻頁： 100008 - 100008 2021年12月

Controlling WC/Co two-phase microstructure of cemented carbides additive-manufactured by laser powder bed fusion: Effect of powder composition and post heat-treatment 査読有り

Ibe, H; Kato, Y; Yamada, J; Kato, M; Suzuki, A; Takata, N; Kobashi, M

MATERIALS & DESIGN 210 巻頁： 110034 - 110034 2021年11月

Control of surface micro-structure for Al alloy/polymer joining fabricated by laser process using Al-Ti-C powders: Effect of powder composition 査読有り

Kim, SG; Suzuki, A; Takata, N; Kobashi, M

JOURNAL OF ADVANCED JOINING PROCESSES 4 巻頁： 100068 - 100068 2021年11月

Inhomogeneous Microstructure and its Thermal Stability of AlSi10Mg Lattice Structure Manufactured via Laser Powder Bed Fusion

Mulin Liu, Naoki Takata, Asuka Suzuki, Makoto Kobashi

Materials Science Forum 1016 巻頁： 826 - 831 2021年10月

記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）

The inhomogeneous microstructure and its change by annealing for an AlSi10Mg lattice structure with a body-centered cubic unit cell additively manufactured via laser powder bed fusion (LPBF) were investigated. The as-built lattice structure exhibited a cellular microstructure consisting of a number of primary α-Al phases decorated with α-Al/Si eutectic structure. The developed microstructure varied depending on the locations of the node and strut parts of the lattice structure. At the location near the bottom surface of the node part, the cellular microstructure became coarser and more equiaxed than those at the location near the top surface. At the location near the bottom surface of the strut part, the columnar α-Al phases were often elongated along the direction of the strut part. After the annealing at 300 °C for 2 h, numerous Si particles finely precipitated within the primary α-Al phases and coarsening of the eutectic Si phases occurred. After the annealing at 530 °C for 6 h, the microstructural characteristics changed significantly. A significant coarsening of the Si particles and the formation of Fe-containing intermetallic phase (Β-AlFeSi) with a plate-shaped morphology occurred. The microstructures became homogeneous in the whole area of the lattice structure annealed at 530 °C for 6 h.

DOI： 10.4028/www.scientific.net/MSF.1016.826

Effect of added stabilizing elements on thermal activation process of plastic deformation in 18Cr ferritic stainless steel 査読有り

Li, HM; Takata, N; Kobashi, M; Yoshino, M

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING 824 巻 2021年9月

Influence of added fourth elements on precipitation in heat-resistant Al-Mg-Zn ternary alloys

Hiroki Ishii, Rikito Takagi, Naoki Takata, Asuka Suzuki, Makoto Kobashi

Journal of Japan Institute of Light Metals 71 巻 ( 7 ) 頁： 275 - 282 2021年7月

Thermal activation process of plastic deformation in Fe-18Cr single-crystal micropillars with high-density dislocations 査読有り

Li, HM; Zhu, TQ; Takata, N; Kobashi, M; Yoshino, M

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING 819 巻 2021年7月

In Situ X-Ray Observations and Microstructural Characterizations for Understanding Combustion Foaming and Reaction Processes to Synthesize Porous Al3Ti Composites From Al-Ti-B4C Powders 査読有り

Inukai, T; Suzuki, A; Takata, N; Kobashi, M; Okada, Y; Furukawa, Y

ADVANCED ENGINEERING MATERIALS 23 巻 ( 5 ) 2021年5月

Critical resolved shear stress of activated slips measured by micropillar compression tests for single-crystals of Cr-based Laves phases 査読有り国際共著

Xue, YL; Takata, N; Li, HM; Kobashi, M; Yuan, L

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING 806 巻 2021年3月

Processability and Optimization of Laser Parameters for Densification of Hypereutectic Al-Fe Binary Alloy Manufactured by Laser Powder Bed Fusion 査読有り

Wang, WY; Takata, N; Suzuki, A; Kobashi, M; Kato, M

CRYSTALS 11 巻 ( 3 ) 2021年3月

Understanding and suppressing shear band formation in strut-based lattice structures manufactured by laser powder bed fusion 査読有り

Xiaoyang Liu, Takafumi Wada, Asuka Suzuki, Naoki Takata, Makoto Kobashi, Masaki Kato

MATERIALS & DESIGN 199 巻頁： 109416 2021年2月

Understanding and suppressing shear band formation in strut-based lattice structures manufactured by laser powder bed fusion 査読有り

Xiaoyang Liu, Takafumi Wada, Asuka Suzuki, Naoki Takata, Makoto Kobashi, Masaki Kato

MATERIALS & DESIGN 199 巻頁： 109416 2021年2月

Joint strength of Fe/epoxy resin hybrid structure via porous Fe/TiB2 composite layer synthesized by in-situ reaction process 査読有り

Suzuki, A; Noritake, K; Takata, N; Kobashi, M

JOURNAL OF MATERIALS PROCESSING TECHNOLOGY 288 巻 2021年2月

Effect of trace solute titanium on plastic deformation of α-(Fe, Cr) single-crystal micropillars fabricated from 18Cr ferritic stainless steel 査読有り

Li, HM; Zhu, TQ; Takata, N; Kobashi, M; Yoshino, M

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING 803 巻 2021年1月

Microstructure of Al-2.5 Fe Binary Alloy Fabricated by Laser Powder Bed Fusion 査読有り国際誌

Xing Qi, Naoki Takata, Asuka Suzuki, Makoto Kobashi, Masaki Kato

Materials Science Forum 1016 巻頁： 1175 - 1180 2021年1月

Mechanical behavior of in-situ alloyed Ti6Al4V(ELI)-3 at.% Cu lattice structures manufactured by laser powder bed fusion and designed for implant applications 査読有り国際共著

Vilardell, AM; Takezawa, A; du Plessis, A; Takata, N; Krakhmalev, P; Kobashi, M; Albu, M; Kothleitner, G; Yadroitsava, I; Yadroitsev, I

JOURNAL OF THE MECHANICAL BEHAVIOR OF BIOMEDICAL MATERIALS 113 巻頁： 104130 - 104130 2021年1月

Manufacturing and characterization of in-situ alloyed Ti6Al4V(ELI)-3 at.% Cu by laser powder bed fusion 査読有り国際共著

Vilardell, AM; Yadroitsev, ; Yadroitsava, ; Albu, M; Takata, N; Kobashi, M; Krakhmalev, P; Kouprianoff, D; Kothleitner, G; du Plessis, A

ADDITIVE MANUFACTURING 36 巻 2020年12月

Effect of Annealing on Anisotropic Tensile Properties of Al-12%Si Alloy Fabricated by Laser Powder Bed Fusion 査読有り

Liu, M; Wada, T; Suzuki, A; Takata, N; Kobashi, M; Kato, M

CRYSTALS 10 巻 ( 11 ) 2020年11月

Formation of multiple intermetallic phases in a hypereutectic Al-Fe binary alloy additively manufactured by laser powder bed fusion 査読有り

Wang, WY; Takata, N; Suzuki, A; Kobashi, M; Kato, M

INTERMETALLICS 125 巻 2020年10月

Laser powder bed fusion of a near-eutectic Al-Fe binary alloy: Processing and microstructure 査読有り

Qi, X; Takata, N; Suzuki, A; Kobashi, M; Kato, M

ADDITIVE MANUFACTURING 35 巻 2020年10月

Manufacturing Aluminum/Multiwalled Carbon Nanotube Composites via Laser Powder Bed Fusion 査読有り国際共著

Lee, ER; Shin, SE; Takata, N; Kobashi, M; Kato, M

MATERIALS 13 巻 ( 18 ) 2020年9月

Morphology and mechanical properties of the T-Al6Mg11Zn11 phase in the eutectic microstructure of Al-Zn-Mg ternary alloys 査読有り

Takata, N; Okano, T; Aikawa, M; Suzuki, A; Kobashi, M; Hagihara, K

INTERMETALLICS 124 巻 2020年9月

Compressive Properties of Al-Si Alloy Lattice Structures with Three Different Unit Cells Fabricated via Laser Powder Bed Fusion 査読有り国際誌

Liu, XY; Sekizawa, K; Suzuki, A; Takata, N; Kobashi, M; Yamada, T

MATERIALS 13 巻 ( 13 ) 2020年7月

超硬合金粉末を用いたレーザ積層造形の微視組織形成過程

67 巻 ( 6 ) 頁： 313 - 319 2020年6月

超硬合金粉末を用いたレーザ積層造形の微視組織形成過程

伊部博之, 加藤雄太, 山田純也, 加藤正樹, 鈴木飛鳥, 高田尚記, 小橋眞

粉体および粉末冶金 67 巻 ( 6 ) 頁： 313 - 319 2020年6月

Effect of Heat Treatment on Gradient Microstructure of AlSi10Mg Lattice Structure Manufactured by Laser Powder Bed Fusion 査読有り国際誌

Liu, ML; Takata, N; Suzuki, A; Kobashi, M

MATERIALS 13 巻 ( 11 ) 2020年6月

Anomalous strengthening by supersaturated solid solutions of selectively laser melted Al-Si-based alloys 査読有り

Takata, N; Liu, ML; Kodaira, H; Suzuki, A; Kobashi, M

ADDITIVE MANUFACTURING 33 巻 2020年5月

Microstructure and compressive properties of porous hybrid materials consisting of ductile Al/Ti and brittle Al3Ti phases fabricated by reaction sintering with space holder 査読有り

Suzuki, A; Kosugi, N; Takata, N; Kobashi, M

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING 776 巻 2020年3月

In Situ Scanning Electron Microscopy Observation of Crack Initiation and Propagation in Hydroxide Films Formed by Steam Coating on Aluminum-Alloy Sheets 査読有り国際誌

Li, HM; Takata, N; Kobashi, M; Serizawa, A

MATERIALS 13 巻 ( 5 ) 2020年3月

Effect of hot-press thermal history on joint strength of A5052/Polyamide-6 hybrid structure via a porous layer 査読有り

Kim, SG; Suzuki, A; Takata, N; Kobashi, M

JOURNAL OF MATERIALS PROCESSING TECHNOLOGY 276 巻 2020年2月

Anomalous size-dependent strength in micropillar compression deformation of commercial-purity aluminum single-crystals

Takata, N; Takeyasu, S; Li, HM; Suzuki, A; Kobashi, M

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING 772 巻 2020年1月

Development of gradient microstructure in the lattice structure of AlSi10Mg alloy fabricated by selective laser melting

Liu, ML; Takata, N; Suzuki, A; Kobashi, M

JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY 36 巻頁： 106 - 117 2020年1月

Influence of Brazing Time on Liquid Migration and Cell Structure of Porous Aluminum

Kurosaki, T; Kobashi, M; Takata, N; Suzuki, A; Minoda, T

MATERIALS TRANSACTIONS 61 巻 ( 2 ) 頁： 368 - 374 2020年

Strain Rate Sensitivity of Flow Stress Measured by Micropillar Compression Test for Single Crystals of 18Cr Ferritic Stainless Steel

Zhu, TQ; Li, HM; Takata, N; Kobashi, M; Yoshin, M

ISIJ INTERNATIONAL 60 巻 ( 4 ) 頁： 774 - 781 2020年

Preparation and Magnetic Properties of Nano-Sized Iron Powder Particles Coated with Silica Film by Calcium Hydride Reduction Method

Matsumoto, A; Sugiura, T; Kobashi, M; Yamamoto, S

MATERIALS TRANSACTIONS 61 巻 ( 7 ) 頁： 1404 - 1408 2020年

Adhesion properties of hydroxide films formed on the Al-Mg-Si aluminum alloy sheets prepared by steam coating process

Hongmei Li, Naoki Takata, Makoto Kobashi, Ai Serizawa

Keikinzoku Yosetsu/Journal of Light Metal Welding 58 巻頁： 102 - 106 2020年

掲載種別：研究論文（学術雑誌）

© 2020 Japan Light Metal Welding Association In this study, in order to evaluate the adhesion properties of the hydroxide film formed on 6061 alloy (Al-1Mg- 0.6Si (wt.％)) sheets prepared by steam coating, we examined the microstructure and cracking behavior of hydroxide film on Al alloy sheets prepared by steam coating at 220°C for 24 h. EBSD analyses revealed the steam-coated sample exhibits microstructure of a-Al matrix consisted of equiaxed grains with a mean grain size of approximately 20 mm. The studied sample exhibits high hardness of 79 HV due to the strengthening by the precipitates of nanoscale particles (Mg2Si). The observation for the surface morphologies revealed the hydroxide film consisted of a number of particles with a mean size of approximately 300 nm and cross-sectional microstructural observations identified a continuous hydroxide film with a thickness of approximately 1.2 mm. The XRD measurement demonstrated the formed hydroxide film consisted of the g-AlO(OH) phase. Minute microstructure analyses revealed that the hydroxide film exhibits a dual layer structure consisting of g-AlO(OH) crystalline layer on the surface and a continuous Al-rich layer on the Al alloy. The cracking and delamination behavior of the hydroxide film were examined by bending test. It was found that the local delamination of g-AlO(OH) phase would occur under compressive stress rather than tensile stress, whereas the delamination of the hydroxide film from the Al alloy substrate was not observed. These results indicate that the hydroxide film prepared by steam coating has a remarkable adhesion strength on the Al alloy substrate.

DOI： 10.11283/jlwa.58.102s

Topology optimization and characterization of Ti6A14V ELI cellular lattice structures by laser powder bed fusion for biomedical applications

アルミニウム合金粉末のレーザ積層造形に伴う組織形成の理解に向けて

66 巻 ( 12 ) 頁： 573 - 580 2019年12月

アルミニウム合金粉末のレーザ積層造形に伴う組織形成の理解に向けて

66 巻 ( 12 ) 頁： 573 - 580 2019年12月

Vilardell, AM; Takezawa, A; du Plessis, A; Takata, N; Krakhmalev, P; Kobashi, M; Yadroitsava, I; Yadroitsev, I

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING 766 巻 2019年10月

Effects of Heat Treatments on Compressive Deformation Behaviors of Lattice-Structured AlSi10Mg Alloy Fabricated by Selective Laser Melting

Suzuki, A; Sekizawa, K; Liu, ML; Takata, N; Kobashi, M

ADVANCED ENGINEERING MATERIALS 21 巻 ( 10 ) 頁： 1900571 - 1900571 2019年10月

Synthesis and structural control of Fe-based porous layer on Fe substrate for joining with resin parts using combustion reaction

Suzuki, A; Noritake, K; Takata, N; Kobashi, M

ADVANCED POWDER TECHNOLOGY 30 巻 ( 10 ) 頁： 2101 - 2109 2019年10月

レーザ積層造形技術が生み出すアルミニウム合金造形体の特異な組織形成

91 巻 ( 9 ) 頁： 612 - 617 2019年9月

レーザ積層造形技術が生み出すアルミニウム合金造形体の特異な組織形成

91 巻 ( 9 ) 頁： 612 - 617 2019年9月

CaH2還元によるSiO2被覆Feナノ粒⼦の合成と磁気特性

66 巻 ( 9 ) 頁： 429 - 433 2019年9月

CaH2還元によるSiO2被覆Feナノ粒⼦の合成と磁気特性

66 巻 ( 9 ) 頁： 429 - 433 2019年9月

Microstructure and cracking behavior of hydroxide films formed on aluminum-alloy sheets prepared by steam coating

Li, HM; Takata, N; Kobashi, M; Serizawa, A

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING 764 巻 2019年9月

Joining of metals and polymers using powder metallurgy with laser irradiation

Kim, SG; Suzuki, A; Takata, N; Kobashi, M

JOURNAL OF MATERIALS PROCESSING TECHNOLOGY 270 巻頁： 1 - 7 2019年8月

Design of laser parameters for selectively laser melted maraging steel based on deposited energy density

Suzuki, A; Nishida, R; Takata, N; Kobashi, M; Kato, M

ADDITIVE MANUFACTURING 28 巻頁： 160 - 168 2019年8月

Formation of Fe2Al5 Phase Layer on Fe-Si Alloy Sheets Hot-Dipped in Zn-0.2Al Alloy Melt

Takata, N; Hayano, K; Suzuk, A; Kobashi, M

TETSU TO HAGANE-JOURNAL OF THE IRON AND STEEL INSTITUTE OF JAPAN 105 巻 ( 7 ) 頁： 701 - 708 2019年7月

Formation sequence of Fe-Al intermetallic phases at interface between solid Fe and liquid Zn-6Al-3Mg alloy

Yokoi, H; Takata, N; Suzuki, A; Kobashi, M

INTERMETALLICS 109 巻頁： 74 - 84 2019年6月

Effect of powder blending ratio on porous structure formed by combustion synthesis reaction between Ni and Al together with space holder 査読有り

Yunmao Shu, Asuka Suzuki, Naoki Takata, Makoto Kobashi

Journal of Functionally Graded Materials 33 巻頁： 38 - 43 2019年5月

ろう付用Al–Si系合金材を用いたポーラスアルミニウムの接合におけるポーラスアルミニウムの気孔構造変化と液相の挙動

69 巻 ( 2 ) 頁： 93 - 100 2019年2月

ろう付用Al–Si系合金材を用いたポーラスアルミニウムの接合におけるポーラスアルミニウムの気孔構造変化と液相の挙動

69 巻 ( 2 ) 頁： 93 - 100 2019年2月

Fabrication of porous NiAl intermetallic compounds with a hierarchical open-cell structure by combustion synthesis reaction and space holder method 査読有り

Shu, YM; Suzuki, A; Takata, N; Kobashi, M

JOURNAL OF MATERIALS PROCESSING TECHNOLOGY 264 巻頁： 182 - 189 2019年2月

Transmission Electron Microscopic Observation of Layered Double Hydroxide Films Formed on Aluminum Alloys Prepared by Steam Coating Process

Takata, N; Li, H; Kobashi, M; Shimada, Y; Serizawa, A; Ishizaki, T

TETSU TO HAGANE-JOURNAL OF THE IRON AND STEEL INSTITUTE OF JAPAN 105 巻 ( 2 ) 頁： 177 - 182 2019年2月

記述言語：日本語出版者・発行元：一般社団法人日本鉄鋼協会

Microstructures and crystallographic features of layered double hydroxide (LDH) particles and the LDH film formed on the aluminum alloy sheet (alloy 7075) using the steam coating process were examined by transmission electron microscopy (TEM). The LDH powder particles exhibited a hexagonal-disc-shape morphology. Their disc plane and side planes were parallel to a basal plane and prism planes of the LDH hexagonal crystal, respectively. A cross-sectional thin TEM sample was prepared from the interface between the LDH film and the Al alloy substrate using a focused ion beam combined with pick-up technique. TEM observations revealed that the LDH film formed on the Al alloy exhibited a dual-layer structure, which consists of a continuous Zn-rich amorphous layer (including numerous nano-particles with fcc structure) on the Al substrate side and a LDH layer composed of a number of disc-shaped LDH particles.

DOI： 10.2355/tetsutohagane.TETSU-2018-064

CiNii Books

Synthesis of porous Al/Al3Ti composite with hierarchical open-cell structure for combining with phase change material 査読有り

Suzuki, A; Miyake, S; Naruse, W; Takata, N; Kobashi, M

JOURNAL OF ALLOYS AND COMPOUNDS 770 巻頁： 1100 - 1111 2019年1月

Microstructure and strength of a novel heat-resistant aluminum alloy strengthened by T-Al6Mg11Zn11 phase at elevated temperatures 査読有り

Takata, N; Ishihara, M; Suzuki, A; Kobashi, M

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING 739 巻頁： 62 - 70 2019年1月

Microstructure and Mechanical property o f Porous Nickel aluminides Fabricated by Reactive Synthesis with Space Holder Powder

Shu Yunmao, Suzuki Asuka, Takata Naoki, Kobashi Makoto

MRS ADVANCES 4 巻 ( 25-26 ) 頁： 1515 - 1521 2019年

Tensile Properties of a Heat-Resistant Aluminium Alloy Strengthened by T-Al6Mg11Zn11 Intermetallic Phase

Nakatsuka Satoshi, Ishihara Masato, Takata Naoki, Suzuki Asuka, Kobashi Makoto

MRS ADVANCES 4 巻 ( 25-26 ) 頁： 1485 - 1490 2019年

水蒸気プロセスにより作製したアルミニウム合金表面の層状複水酸化物皮膜の透過電子顕微鏡観察

105 巻 ( 2 ) 頁： 299 - 303 2019年

溶融Zn-0.2Al浴に浸漬したFe-Si合金におけるFe2Al5 相の形成

105 巻 ( 7 ) 頁： 701 - 708 2019年

460°CにおけるFe-Si合金/純Zn浴の特異な固液界面反応

105 巻 ( 7 ) 頁： 693 - 700 2019年

460°CにおけるFe-Si合金/純Zn浴の特異な固液界面反応

105 巻 ( 7 ) 頁： 693 - 700 2019年

AlSi10Mg合金粉末を用いたレーザ積層造形の数値シミュレーション

生出佳, 小林卓哉, 高田尚記, 小橋眞

計算力学講演会講演論文集 2019.32 巻頁： 096 2019年

Structural design and bonding strength evaluation of Al/epoxy resin joint via interpenetrating phase layer 査読有り

Suzuki, A; Arai, Y; Takata, N; Kobashi, M

JOURNAL OF MATERIALS PROCESSING TECHNOLOGY 262 巻頁： 11 - 18 2018年12月

Microstructural characterization of cellular AlSi10Mg alloy fabricated by selective laser melting 査読有り

Liu, ML; Takata, N; Suzuki, A; Kobashi, M

MATERIALS & DESIGN 157 巻頁： 478 - 491 2018年11月

Size dependence of microstructure of AlSi10Mg alloy fabricated by selective laser melting 査読有り

Takata, N; Kodaira, H; Suzuki, A; Kobashi, M

MATERIALS CHARACTERIZATION 143 巻頁： 18 - 26 2018年9月

Kinetics of Zr-Al intermetallic compound formation during ultra-high vacuum magnetron sputter-deposition of Zr/Al2O3(0001) thin films

Tanaka, K; Fankhauser, J; Zaid, H; Aleman, A; Sato, M; Yu, DA; Ebnonnasir, A; Li, C; Kobashi, M; Goorsky, MS; Kodambaka, S

ACTA MATERIALIA 152 巻頁： 34 - 40 2018年6月

Crystallographic Features of Microstructure in Maraging Steel Fabricated by Selective Laser Melting 招待有り査読有り

Takata, N; Nishida, R; Suzuki, A; Kobashi, M; Kato, M

METALS 8 巻 ( 6 ) 頁： 440 2018年6月

高純度アルミニウム単結晶マイクロピラーの強度に及ぼす試験片寸法および形状の影響

68 巻 ( 5 ) 頁： 250 - 256 2018年5月

高純度アルミニウム単結晶マイクロピラーの強度に及ぼす試験片寸法及び形状の影響招待有り査読有り

竹安崇一郎, 高田尚記, 鈴木飛鳥, 小橋眞

軽金属 68 巻 ( 5 ) 頁： 250-256 - 256 2018年5月

Effect of layer thickness on bonding strength of Al/epoxy resin joints via interpenetrating phase layer 査読有り

Suzuki, A; Arai, Y; Takata, N; Kobashi, M

JOURNAL OF MATERIALS PROCESSING TECHNOLOGY 254 巻頁： 338 - 345 2018年4月

Microstructure of intermetallic-reinforced Al-Based alloy composites fabricated using eutectic reactions in Al-Mg-Zn ternary system 査読有り

Takata, N; Okano, T; Suzuki, A; Kobashi, M

INTERMETALLICS 95 巻頁： 48 - 58 2018年4月

記述言語：英語掲載種別：研究論文（学術雑誌）

We designed two types of Al-based alloy composites reinforced by η-Zn2Mg (hexagonal) and T-Al6Mg11Zn11 (cubic) intermetallic phases using monovariant eutectic reactions in the Al–Mg–Zn ternary system and then attempted to fabricate them using solidification. Thermodynamic assessment revealed two alloy compositions of Al–18Mg–36Zn and Al–22.5Mg–23.5Zn (at%) with the α-Al (fcc) phase reinforced with high fractions (>50%) of the η and T phases. Both alloys exhibited fine two-phase eutectic microstructures consisting of α/η and α/T phases, respectively. The morphology of the α-Al phase in the eutectic colonies varied from lamellae to fibers upon changing the neighboring intermetallic phase. These eutectic microstructures exhibit high stability at an elevated temperature of 300 °C. In addition, the size and spacing of the α-Al phase could be controlled by changing the cooling rate during solidification. The fabricated composites exhibited high hardness values exceeding 220 HV, which were much superior to those of conventional Al alloys. The calculated solidification path and component partitioning in the liquid phase during solidification provided insights into th

DOI： 10.1016/j.intermet.2018.01.018