Faculty Profiles - KOBASHI, Makoto

Papers - KOBASHI, Makoto

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Porous Ti-Al Intermetallic Based Alloys Fabricated by Pressure-Sintering Elemental Powders with a Space holder Powder Reviewed

Naoki Takata, Keisuke Uematsu, Makoto Kobashi

MRS ADVANCES Vol. 2 ( 26 ) page： 1387 - 1392 2017

Language：English Publishing type：Research paper (scientific journal) Publisher：CAMBRIDGE UNIV PRESS

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 pm) and Al (particle size: <45 pm) were mixed to various total compositions of Ti-0-40 Al (at.%), and NaCl (particle size: 300-400 mu m) was mixed with the Ti/Al powder to give a highly porous structure. The mixed powder was sintered at 700 degrees C: 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-AI 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 degrees 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 Ti(3)AI single-phase would he an effective method to achieve high energy absorption capacity of the porous Ti Al alloy.

DOI： 10.1557/adv.2017.123

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Reactive processing of aluminum matrix composites

Makoto Kobashi, Naoki Takata, Asuka Suzuki

Journal of Japan Institute of Light Metals Vol. 67 ( 11 ) page： 571 - 575 2017

Implementation of DSC analysis in reaction kinetics during heating of Ti-50 at.%Al powder mixture Reviewed

M. Adeli, S. H. Seyedein, M. R. Aboutalebi, M. Kobashi, N. Kanetake

J. Thermal Analysis and Calorimetry Vol. 128 ( 2 ) page： 867-874 2016.12

圧縮ねじり加工における試料内せん断ひずみ分布に対する回転回数の影響 Reviewed

久米裕二, 本橋雅和, 小橋眞, 金武直幸

塑性と加工 Vol. 57 ( 664 ) page： 468-472 2016.5

Growth and Characterization of Epitaxial Zr(0001) Thin Films on Al2O3(0001) Reviewed

J. Fankhauser, M. Sato, D. Yu, A. Ebnonnasir, M. Kobashi, M. S. Goorsky, S. Kodambaka

J. Vacuum Sci. & Tech. A Vol. 34 2016

圧縮ねじり成形による Cu-Cr 混合粉末の低温固化成形と微視組織制御 Reviewed

久米裕二, 高市祐太郎, 小橋眞, 金武直幸, 他４名

銅と銅合金 Vol. 54 page： 163-168 2015.9

Porous composite with negative thermal expansion obtained by photopolymer additive manufacturing Reviewed

A. Takezawa, M. Kobashi, Y. Koizumi, M. Kitamura

Vol. 3 2015.7

X線CTを用いたシンタクティックフォーム/アルミニウムフォーム相互浸透複合材料の圧縮変形挙動の解析 Invited Reviewed

成瀬　亘、近藤紗也子、小橋　眞、他３名

軽金属 Vol. 64 page： 598-603 2014.10

Structural topology optimization with strength and heat conduction constraints Reviewed

A.Takezawa, G.H. Yoon, S.H.Jeong, M.Kobashi, M.Kitamura

Computer Methods in Applied Mechanics and Engineering 2014.4

Combustion foaming of Al-Ti intermetallics studied in situ by fast X-ray radioscopy Invited Reviewed

Y. Arakawa, C. Jiménez, F. García-Moreno, J. Banhart, M. Kobashi, et. al.

Procedia Materials Science Vol. 4 page： 268-272 2014

Hierarchical open cellular porous TiAl manufactured by space holder process Reviewed

M.Kobashi, S.Miyake, N.Kanetake

Intermetallics Vol. 42 page： 32-34 2013.7

Foaming Behavior of Long Scale Al-Ti Intermetallic Foam by SHS Mode Combustion Reaction Reviewed

Y.Arakawa M.Kobashi N.Kanetake

Intermetallics Vol. 41 page： 22-27 2013.5

圧縮ねじり加工した過共晶Al-Si合金の機械的特性 Reviewed

久米裕二、大田真一郎、小橋　眞、金武直幸

軽金属 Vol. 63 ( 5 ) page： 182-187 2013.5

圧縮ねじり加工によるAl-Fe合金の晶出物微細化と機械的特性 Reviewed

久米裕二、大田真一郎、小橋眞、金武直幸

塑性と加工 Vol. 54 ( 625 ) page： 175-180 2013.2

圧縮ねじり加工によるCu-Cr複相合金焼結体のクロム粒子微細化

久米裕二、高市祐太郎、小橋　眞、金武直幸

銅と銅後金 Vol. 51 ( 1 ) page： 25-30 2013.1

Effect of Elemental Powder Size on Foaming Behavior of NiTi Alloy Made by Combustion Synthesis Reviewed

Y.Arakawa, M.Kobashi, N.Kanetake

Materials Vol. 5 ( 7 ) page： 1267-1274 2012.7

Effect of precursor's composition and thickness on foaming behavior of Al-Ti intermetallics in volume combustion and self-propagating high-temperature synthesis modes Reviewed

M.Kobashi S.Murata N.Kanetake

Materials Science Research Vol. 1 ( 4 ) page： 1-10 2012.4

Fabrication of Porous Fe/TiB2 Composites by Reactive Precursor Method Reviewed

O. Kato, M. Kobashi, N.Kanetake

Journal of Materials Science Research Vol. 1 ( 2 ) page： 110-118 2012.2

Effect of precursor's composition and thickness on foaming behavior of Al-Ti intermetallics in volume combustion and self-propagating high-temperature synthesis modes Reviewed

M.Kobashi, S.Murata, N.Kanetake

Journal of Materials Science Research Vol. 1 ( 4 ) page： 1-10 2012

Effect of heat absorbing powder addition on cell morphology of porous titanium composite manufactured by reactive precursor method Reviewed

M.Kobashi, Y.Kamiya, N.Kanetake

Materials Science & Engineering A Vol. 556 page： 388-394 2012

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