研究者詳細 - 髙田　尚記

論文 - 髙田　尚記

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Effect of boron addition on liquid zinc embrittlement of heat affected zone in 490 MPa grade steels

Yamamoto M.

Tetsu-To-Hagane/Journal of the Iron and Steel Institute of Japan 105 巻 ( 7 ) 頁： 742 - 751 2019年

Toward understanding the mechanism behind microstructure development of aluminum alloy powders additively manufactured by selective laser melting 招待有り査読有り

Takata N.

Funtai Oyobi Fummatsu Yakin/Journal of the Japan Society of Powder and Powder Metallurgy 66 巻 ( 12 ) 頁： 573 - 580 2019年

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

Mulin Liu, Naoki Takata, Asuka Suzuki, Makoto Kobashi

Materials and Design 157 巻頁： 478-491 2018年8月

Crystallographic Features of Microstructure in Maraging Steel Fabricated by Selective Laser Melting

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

METALS 8 巻 ( 6 ) 2018年6月

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

Asuka Suzuki, Yuta Arai, Naoki Takata, Makoto Kobashi

Journal of Materials Processing Technology 262 巻頁： 11-18 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 2018年5月

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

Naoki Takata, Taiki Okano, Asuka Suzuki, Makoto Kobashi

Intermetallics 95 巻頁： 48-58 2018年4月

担当区分：筆頭著者記述言語：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 the solidification segregation of Zn element in the Al–18Mg–36Zn alloy. The Zn-enriched regions would enhance the local microstructural change at elevated temperatures, which confirmed by the microstructural observations of the alloy exposed at 300 °C

DOI： 10.1016/j.intermet.2018.01.018

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

Asuka Suzuki, Yuta Arai, Naoki Takata, Makoto Kobashi

Journal of Materials Processing Tech. 254 巻頁： 338-345 2018年1月

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

Naoki Takata⁠, Hirohisa Kodaira⁠, Asuka Suzuki, Makoto Kobashi

Materials Characterization 頁： in press 2018年

Enhanced Interfacial Reaction of Fe-Si Alloy Sheets Hot-Dipped in Zn Melt at 460 degrees C 査読有り

Takata Naoki, Hayano Kunihisa, Suzuki Asuka, Kobashi Makoto

ISIJ INTERNATIONAL 58 巻 ( 9 ) 頁： 1608-1615 2018年

金属粉末レーザ積層造形法によって作製されたAl-10Si-0.4Mg合金の組織と機械的性質査読有り

高田尚記, 小平寛久, 関沢圭人, 鈴木飛鳥, 小橋眞

軽金属 67 巻 ( 11 ) 頁： 582-588 2017年11月

化学反応を利用したアルミニウム基複合材料の製造方法招待有り査読有り

小橋眞, 高田尚記, 鈴木飛鳥

軽金属 67 巻 ( 11 ) 頁： 571-575 2017年11月

Solid Fe/Liquid Zn Interfacial Reaction of Hot-Dip Galvanized Fe-Si Alloy Sheets 招待有り査読有り

Naoki Takata, Kunihisa Hayano, Asuka Suzuki, Makoto Kobashi

Proceedings of GALVATEC2017 (11th International Conference on Zinc and Zinc Alloy Coated Steel Sheet) 頁： 177-181 2017年11月

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

Takata Naoki, Kodaira Hirohisa, Sekizawa Keito, Suzuki Asuka, Kobashi Makoto

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

燃焼合成反応を利用した Fe/TiB2 複合材料の合成とポーラス化査読有り

伊藤峻，高田尚記，小橋眞

粉体および粉末冶金 64 巻 ( 6 ) 頁： 288-294 2017年7月

記述言語：日本語掲載種別：研究論文（学術雑誌）

Porous metals show some unique properties, which bulk metals cannot exhibit. Especially, iron-based porous metals are expected to be applied to structural components because of their high strength, high rigidity, low material cost and so on. In this research, we synthesized porous Fe/TiB2 composites by Fe-Ti-B combustion reaction. Iron, titanium and boron powders were blended to synthesize 30 to 60vol%TiB2 particles in Fe matrix after the combustion synthesis reaction. Four kinds of iron powders (powder size: < 53 μm, < 150 μm, 600 μm and 850-1000 μm) were used. The blended powder was heated to induce the combustion synthesis reaction. When < 53 μm and < 150 μm iron powders were used, irregular shaped and open pores were formed. On the other hand, when 600 μm and 850-1000 μm iron powders were used, spherical pores whose sizes and shapes were similar to those of iron powders were formed

DOI： http://doi.org/10.2497/jjspm.64.288

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

Takata Naoki, Uematsu Keisuke, Kobashi Makoto

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

Synthesis of porous Fe/TiB<inf>2</inf> composites by means of combustion synthesis reaction 査読有り

Ito S.

Funtai Oyobi Fummatsu Yakin/Journal of the Japan Society of Powder and Powder Metallurgy 64 巻 ( 6 ) 頁： 288 - 294 2017年6月

Porous Ti–Al Intermetallic Based Alloys Fabricated by Pressure-Sintering Elemental Powders with a Space Holder Powder 査読有り

Naoki Takata, Keisuke Uematsu, Makoto Kobashi

MRS Advances 2 巻 ( 26 ) 頁： 1387-1392 2017年1月

担当区分：筆頭著者記述言語：英語掲載種別：研究論文（学術雑誌）

In the present study, we have attempted to produce the porous Ti–Al intermetallic based alloys by pressure-sintering of the elemental powders of Ti and Al through a combustion reaction, with a NaCl space holder to achieve the development of a highly porous structure. The powders of Ti (particle size: <45 μm) and Al (particle size: <45 μm) were mixed to various total compositions of Ti–0-40 Al (at.%), and NaCl (particle size: 300-400 μm) was mixed with the Ti/Al powder to give a highly porous structure. The mixed powder was sintered at 700 oC under a constant pressure of 30 MPa to form cylindrical specimens with a diameter of 20 mm. The soaking of the specimens in pure water allows for the removal of NaCl (with a volume fraction of 60 %) and the formation of the pores to achieve a controlled relative density of 0.4. The present process can produce porous Ti–Al alloys with various compositions. In as-sintered Ti–Al specimens, an inhomogeneous microstructure consisting of Ti particles surrounded by the a Ti–Al alloy layer (various Ti–Al intermetallic phases) was observed. The as-sintered specimens exhibited the brittle behavior under compression, which is independent of their Al content. However, in a Ti–20Al alloy heat-treated at 1300 °C, a nearly Ti3Al single-phase microstructure appeared in the porous specimen. The heat-treated porous Ti–20Al alloy shows both a high plateau-strength level of approximately 100 MPa and a high plateau-end strain over 50%, resulting in a high absorption energy. The present results demonstrate that controlling the microstructure for the formation of the Ti3Al single-phase would be an effective method to achieve high energy absorption capacity of the porous Ti–Al alloy.

DOI： 10.1557/adv.2017.123

Solid Fe/Liquid Zn Interfacial Reaction of Hot-Dip Galvanized Dual-Phase Steels 査読有り

Naoki Takata, Makoto Kobashi, Masao Takeyama

Proceedings of the 9th Pacific Rim International Conference on Advanced Materials and Processing (PRICM9) 頁： 496-501 2016年8月

Solidification of Bcc/T1/T2 three-phase microstructure in Mo–Nb–Si–B alloys 査読有り

N. Takata, N. Sekido, M. Takeyama, J.H. Perepezko, M. Follett-Figueroa, C. Zhang

Intermetallics 72 巻頁： 1-8 2016年5月

担当区分：筆頭著者記述言語：英語掲載種別：研究論文（学術雑誌）

The three-phase, (Mo,Nb)ss/(Mo,Nb)5Si3/(Mo,Nb)5SiB2, Bcc/T1/T2 microstructures that develop in Mo–Nb–Si–B alloys have been examined in arc cast and directionally solidified samples to identify the phase sequencing during solidification. A Mo-32.6Nb-19.5Si-4.7B (at.%) alloy was directionally solidified using an optical floating zone (OFZ) furnace in a flowing Ar gas atmosphere at a constant growth rate of 10 mm/h. The microstructure of the directionally solidified alloy is characterized by an elongated T2 phase surrounded by bcc and T1 phases with an interwoven morphology From the evaluation of the microstructures in arc cast ingots of several alloys at a constant 32.6 at%Nb composition, the path of the liquidus valleys with decreasing temperature has been determined to intersect at a common point that establishes the solidification reaction as a eutectic. The incorporation of the experimental results into a computational thermodynamic analysis provides insight on the partitioning of components within each phase during solidification

DOI： doi:10.1016/j.intermet.2016.01.001

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