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The Effect of Reverse Transformation on Recovery • Recrystallization Process in Ti-Pd-Ni High Temperature Shape Memory Alloys

Published online by Cambridge University Press:  10 February 2011

Ya Xu ,
Kazuhiro Otsuka ,
Tatsuhiko Ueki  and
Kengo Mitose
Ya Xu
Affiliation:
Institute of Materials Science, University of Tsukuba, Tsukuba, Ibaraki 305, Japan
Kazuhiro Otsuka
Affiliation:
Institute of Materials Science, University of Tsukuba, Tsukuba, Ibaraki 305, Japan
Tatsuhiko Ueki
Affiliation:
Yokohama R & D Lab., The Furukawa Electric Company Ltd., 2–4–3 Okano, Nishi-ku, Yokohama 220, Japan
Kengo Mitose
Affiliation:
Yokohama R & D Lab., The Furukawa Electric Company Ltd., 2–4–3 Okano, Nishi-ku, Yokohama 220, Japan
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Abstract

The effect of martensitic reverse transformation on recovery • recrystallization process in cold rolled Ti-Pd-Ni high temperature shape memory alloys has been investigated systematically by flash heating treatment, micro-Vickers hardness test, differential scanning calorimetry and transmission electron microscopy. It was found that the temperatures of softening in hardness after flash heating treatments agree well with the reverse transformation temperatures in the present alloys, and most of the softening occurs within 60 seconds when annealing temperature is raised to above the reverse transformation temperature. We conclude that the recovery • recrystallization process is controlled by the reverse transformation. The reasons are considered based on the large difference in atomic diffusion rate in the parent phase and in the martensite.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 459: Symposium Y – Materials for Smart Systems II , 1996 , 413
Copyright
Copyright © Materials Research Society 1997

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References

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