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Phase Constituent and Reverse Martensitic Transformation Temperature of PtTi-CoTi Diffusion Couple Heat-Treated at 1373K

Published online by Cambridge University Press:  09 February 2015

Hideki Hosoda ,
Satoshi Tsutsumi ,
Masaki Tahara ,
Tomonari Inamura ,
Kenji Goto ,
Hiroyasu Kanetaka  and
Yoko Yamabe-Mitarai
Hideki Hosoda
Affiliation:
Precision and Intelligence Laboratory, Tokyo Institute of Technology, Yokohama, Kanagawa, Japan.
Satoshi Tsutsumi
Affiliation:
Precision and Intelligence Laboratory, Tokyo Institute of Technology, Yokohama, Kanagawa, Japan.
Masaki Tahara
Affiliation:
Precision and Intelligence Laboratory, Tokyo Institute of Technology, Yokohama, Kanagawa, Japan.
Tomonari Inamura
Affiliation:
Precision and Intelligence Laboratory, Tokyo Institute of Technology, Yokohama, Kanagawa, Japan.
Kenji Goto
Affiliation:
Tanaka Kikinzoku Kogyo K.K., Hiratsuka, Kanagawa, Japan.
Hiroyasu Kanetaka
Affiliation:
Liaison Center for Innovative Dentistry, Graduate School of Dentistry, Tohoku University, Sendai, Miyagi, Japan.
Yoko Yamabe-Mitarai
Affiliation:
High Temperature Materials Unit, Functional Structure Materials Group, National Institute of Materials Science, Tsukuba, Ibaraki, Japan.
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Abstract

The reverse martensitic (austenite) transformation temperatures (As) were investigated using a diffusion couple of PtTi and CoTi with a continuous compositional gradient. It was found that PtTi and CoTi form a complete solid solution of (Pt, Co)Ti at 1373K. Surface relief was formed by heating due to the austenite transformation. Judging from the formation of the surface patterns and the corresponding chemical compositions, As monotonously decreases with increasing Co content at a rate of -70K/at%Co, and As is estimated to be close to room temperature (RT) when the Co concentration is 15at%Co. Besides, micro Vickers hardness values measured at RT are minimized around 15at%Co.

Keywords

actuatordiffusionphase transformation
Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1760: Symposium YY – Advanced Structural and Functional Intermetallic-Based Alloys , 2015 , mrsf14-1760-yy09-05
Copyright
Copyright © Materials Research Society 2015 

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