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

K. Fujishima, M. Nishida, Y. Morizono, K. Yamaguchi, K. Ishiuchi, T. Yamamuro

研究成果: Contribution to journalArticle査読

22 被引用数 (Scopus)

抄録

We demonstrated by systematic experiments that the appearance and disappearance of a multistage martensitic transformation in aged Ni-rich Ti-Ni alloys depends on the heat treatment atmosphere. No multistage transformation occurs when the evaporation of Ti and/or Ni and the preferential oxidation of Ti are prevented by the purification of the heat treatment atmosphere in an evacuated quartz tube by a Ti-getter. The heterogeneity in precipitation morphology of the Ti3Ni4 phase, which is responsible for the multistage transformation, can thus be suppressed. The influence of changes in the Ni concentration and specimen size on the multistage transformation is also discussed. The multistage transformation is not detected in the concentrated Ni alloy such as Ti-51.4 at.% Ni. All the results obtained in the present study are consistently explained by assuming the formation of zones I and II. The zone I is considered to be a contamination region with interstitial impurity elements, which is responsible for the multistage transformation. The zone II is considered to be a zone of relatively higher Ni concentration as compared to the original alloy composition at the surface.

本文言語英語
ページ(範囲)489-494
ページ数6
ジャーナルMaterials Science and Engineering A
438-440
SPEC. ISS.
DOI
出版ステータス出版済み - 11 25 2006
外部発表はい

All Science Journal Classification (ASJC) codes

  • 材料科学(全般)
  • 凝縮系物理学
  • 材料力学
  • 機械工学

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