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Transformation Behavior of TiNiPt Thin Films Fabricated Using Melt Spinning Technique

Published online by Cambridge University Press:  26 February 2011

Tomonari Inamura ,
Yohei Takahashi ,
Hideki Hosoda ,
Kenji Wakashima ,
Takeshi Nagase ,
Takayoshi Nakano ,
Yukichi Umakoshi  and
Shuichi Miyazaki
Tomonari Inamura
Affiliation:
Precision and Intelligence Laboratory, Tokyo Institute of Technology, Yokohama, Kanagawa 226–8503, Japan.
Yohei Takahashi
Affiliation:
Precision and Intelligence Laboratory, Tokyo Institute of Technology, Yokohama, Kanagawa 226–8503, Japan.
Hideki Hosoda
Affiliation:
Precision and Intelligence Laboratory, Tokyo Institute of Technology, Yokohama, Kanagawa 226–8503, Japan.
Kenji Wakashima
Affiliation:
Precision and Intelligence Laboratory, Tokyo Institute of Technology, Yokohama, Kanagawa 226–8503, Japan.
Takeshi Nagase
Affiliation:
Department of Materials Science & Engineering, Graduate School of Engineering, Osaka University, Suita, Osaka 565–0871, Japan.
Takayoshi Nakano
Affiliation:
Department of Materials Science & Engineering, Graduate School of Engineering, Osaka University, Suita, Osaka 565–0871, Japan.
Yukichi Umakoshi
Affiliation:
Department of Materials Science & Engineering, Graduate School of Engineering, Osaka University, Suita, Osaka 565–0871, Japan.
Shuichi Miyazaki
Affiliation:
Institute of Materials Science, University of Tsukuba, Tsukuba, Ibaraki 305–8573, Japan.
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Abstract

Martensitic transformation behavior of Ti50Ni40Pt10 (TiNiPt) melt-spun ribbons were investigated where the heat treatment temperature was systematically changed from 473K to 773K. A hot-forged bulk TiNiPt material with the similar chemical composition was also tested as a comparison. θ-2θ X-ray diffraction analysis and transmission electron microscopy observation revealed that the as-spun ribbons were fully crystallized. The apparent phases of as-spun ribbons at room temperature are both B19 martensite and B2 parent phase instead of B2 single phase for the hot-forged bulk material. No precipitates were found in as-spun and heat-treated ribbons. It was revealed by differential scanning calorimetry that all the specimens exhibit one-step transformation. The martensitic transformation temperatures of the TiNiPt as-spun ribbons are 100K higher than those of the hot-forged bulk material, and the martensitic transformation temperature decreases with increasing heat treatment temperature.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 842: Symposium S – Integrative and Interdisciplinary Aspects of Intermetallics , 2004 , S3.2
Copyright
Copyright © Materials Research Society 2005

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References

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