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Effect of Heat Treatment Conditions on Multistage Martensitic Transformation in Aged Ni-rich Ti-Ni Alloys

Published online by Cambridge University Press:  26 February 2011

Minoru Nishida ,
Toru Hara ,
Yasuhiro Morizono ,
Mitsuhiro Matsuda  and
Kousuke Fujishima
Minoru Nishida
Affiliation:
Department of Materials Science and Engineering, Kumamoto University, 2–39–1 Kurokami, Kumamoto 860–8555, Japan
Toru Hara
Affiliation:
National Institute for Materials Science, 1–2–1Sengen, Tukuba 305–0047, Japan
Yasuhiro Morizono
Affiliation:
Department of Materials Science and Engineering, Kumamoto University, 2–39–1 Kurokami, Kumamoto 860–8555, Japan
Mitsuhiro Matsuda
Affiliation:
Department of Materials Science and Engineering, Kumamoto University, 2–39–1 Kurokami, Kumamoto 860–8555, Japan
Kousuke Fujishima
Affiliation:
Department of Materials Science and Engineering, Kumamoto University, 2–39–1 Kurokami, Kumamoto 860–8555, Japan
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Abstract

It has been demonstrated with systematic experiments that the appearance and disappearance of multistage martensitic transformation (MMT) in aged Ni-rich Ti-Ni alloys depend on the heat treatment conditions. No multistage transformation occurs when the evaporation of Ti and Ni and/or the preferential oxidation of Ti in the specimen are prevented and the purification of heat treatment atmosphere in an evacuated quartz tube is achieved. The heterogeneity in precipitation morphology of the Ti3Ni4 phase, which is responsible for the multistage transformation can be suppressed with the regulation of heat treatment atmosphere as mentioned above. We have concluded that the multistage martensitic transformation in aged Ni-rich Ti-Ni alloys is extrinsic in nature, and is an artifact during the heat treatment.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 842: Symposium S – Integrative and Interdisciplinary Aspects of Intermetallics , 2004 , S5.1
Copyright
Copyright © Materials Research Society 2005

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References

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