Effect of thermal cycling on multistage martensitic transformation in aged ti-50.8 at% ni alloy

Banafsheh Karbakhsh Ravari, Masatoshi Mitsuhara, Sahar Farjami, Minoru Nishida

研究成果: Contribution to journalArticle査読

2 被引用数 (Scopus)

抄録

The effect of thermal cycling on multistage martensitic transformation (MMT) in aged Ti-50.8 at% Ni alloy was investigated. The specimens were solution-treated at 1273 K for 3.6 ks and then aged at 773 K for 3.6 ks in vacuum without atmosphere regulation. Upon cooling the aged specimens clearly showed quadruple-stage transformation denoted as B2 → R → M1 → M2 → M3. The peak temperatures of exothermic reactions R M1 and M2(corresponding to the R-phase M1 and M2 transformations respectively) in the differential scanning calorimetry (DSC) cooling curve were rather stable up to 100 thermal cycles since there were fine Ti3Ni4 precipitates with high distribution density in the intermediate and grain boundary regions. These precipitates prevented the formation of dislocations during thermal cycling. On the other hand the peak temperature of exothermic reaction M3 (corresponding to the M3 transformation) drastically decreased with increasing the number of thermal cycles since there were large Ti 3Ni4 precipitates with low distribution density. Many dislocations were observed in the central regions of grains after 100 thermal cycles.

本文言語英語
ページ(範囲)2185-2188
ページ数4
ジャーナルMaterials Transactions
54
12
DOI
出版ステータス出版済み - 2013

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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