Microstructure and martensitic transformation behavior in thermal cycled equiatomic CuZr shape memory alloy

Shota Hisada, Mitsuhiro Matsuda, Minoru Nishida, Carlo Alberto Biffi, Ausonio Tuissi

研究成果: ジャーナルへの寄稿記事

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Equiatomic CuZr alloy undergoes a martensitic transformation from the B2 parent phase to martensitic phases (P21/m and Cm) below 150 °C. We clarified the effect of the thermal cycling on the morphology and crystallography of martensite in equiatomic CuZr alloy using a transmission electron microscopy. The 10th cycled specimens consisted of different multiple structures at the maximum temperature of differential scanning calorimetry (DSC) measurement −400 °C and 500 °C, respectively. At the maximum temperature 400 °C of DSC measurement, it is composed of the fine plate-like variants, and a lamellar eutectoid structure consisting of Cu10Zr7 and CuZr2 phases on the martensitic variant. Concerning the maximum temperature of 500 °C of DSC measurement, it is observed the martensitic structure and the lamellar structure in which the martensitic phase was completely eutectoid transformed. The formation of this lamellar eutectoid structure, due to thermal cycling leads to the shift of forward and reverse transformation peaks to low and high temperature side. In addition, new forward and reverse transformation peaks indicating a new transformation appeared by thermal cycling, and the peaks remained around −20 °C. This new martensitic transformation behavior is also discussed.

元の言語英語
記事番号580
ジャーナルMetals
9
発行部数5
DOI
出版物ステータス出版済み - 5 2019

All Science Journal Classification (ASJC) codes

  • Materials Science(all)

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