Effect of heat treatment conditions on multistage martensitic transformation in aged Ni-rich Ti-Ni alloys

Minoru Nishida, Toru Hara, Yasuhiro Morizono, Mitsuhiro Matsuda, Kousuke Fujishima

Research output: Contribution to journalConference article

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.

Original languageEnglish
Article numberS5.1
Pages (from-to)365-370
Number of pages6
JournalMaterials Research Society Symposium Proceedings
Volume842
Publication statusPublished - Aug 25 2005
Externally publishedYes
Event2004 MRS Fall Meeting - Boston, MA, United States
Duration: Nov 29 2004Dec 1 2004

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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