Faculty Profiles - KOBASHI, Makoto

Papers - KOBASHI, Makoto

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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

Vol. 91 ( 9 ) page： 612 - 617 2019.9

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

Vol. 91 ( 9 ) page： 612 - 617 2019.9

CaH2還元によるSiO2被覆Feナノ粒⼦の合成と磁気特性

Vol. 66 ( 9 ) page： 429 - 433 2019.9

CaH2還元によるSiO2被覆Feナノ粒⼦の合成と磁気特性

Vol. 66 ( 9 ) page： 429 - 433 2019.9

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

Hongmei Li, Naoki Takata, Makoto Kobashi, Ai Serizawa

Materials Science and Engineering A Vol. 764 2019.9

Language：Japanese Publishing type：Research paper (scientific journal)

© 2019 Elsevier B.V. To elucidate the adhesion properties of anticorrosion hydroxide films formed on aluminum (Al)-alloy sheets prepared by the steam coating process, cracks that propagated inside the hydroxide film formed on Al–Mg–Si alloy (6061 grade) sheets were characterized. Continuous hydroxide films with different thicknesses of 0.7 μm and 1.4 μm formed at different temperatures of 180 °C and 200 °C, respectively. Microstructural characterizations revealed that these hydroxide films exhibited a dual-layer structure consisting of a polycrystalline γ-AlO(OH) layer (on the surface side) and a continuous amorphous layer (on the Al-alloy side). Bending tests caused numerous cracks inside the hydroxide films under tension and compression. On the tensile-strained surface, numerous vertical cracks penetrated through the hydroxide films, although their delamination was not observed. On the compressive-strained surface, local delamination of the upper γ-AlO(OH) layer occurred. However, cracks were not observed in the lower amorphous layer on the Al-alloy substrate deformed under compression. These results indicate that the dual-layer-structured hydroxide film prepared by steam coating exhibits remarkable adhesion to the Al-alloy substrate.

DOI： 10.1016/j.msea.2019.138247

Web of Science

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Joining of metals and polymers using powder metallurgy with laser irradiation

Seung-Gwang Kim, Asuka Suzuki, Naoki Takata, Makoto Kobashi

Journal of Materials Processing Technology Vol. 270 page： 1 - 7 2019.8

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

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

Additive Manufacturing Vol. 28 page： 160 - 168 2019.8

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

Naoki Takata, Kunihisa Hayano, Asuka Suzuki, Makoto Kobashi

Tetsu-to-Hagane Vol. 105 ( 7 ) page： 701 - 708 2019.7

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

Hiroki Yokoi, Naoki Takata, Asuka Suzuki, Makoto Kobashi

Intermetallics Vol. 109 page： 74 - 84 2019.6

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

Yunmao Shu, Asuka Suzuki, Naoki Takata, Makoto Kobashi

Journal of Functionally Graded Materials Vol. 33 page： 38 - 43 2019.5

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

Vol. 69 ( 2 ) page： 93 - 100 2019.2

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

Vol. 69 ( 2 ) page： 93 - 100 2019.2

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

Yunmao Shu, Asuka Suzuki, Naoki Takata, Makoto Kobashi

Journal of Materials Processing Technology Vol. 264 page： 182 - 189 2019.2

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

Takata Naoki, Li Hongmei, Kobashi Makoto, Shimada Yuta, Serizawa Ai, Ishizaki Takahiro

Tetsu-to-Hagane Vol. 105 ( 2 ) page： 177 - 182 2019.2

Language：Japanese Publisher：The Iron and Steel Institute of Japan

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

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Synthesis of porous Al/Al3Ti composite with hierarchical open–cell structure for combining with phase change material Reviewed

Asuka Suzuki, Shohei Miyake, Wataru Naruse, Naoki Takata, Makoto Kobashi

Journal of Alloys and Compounds Vol. 770 page： 1100 - 1111 2019.1