Electron Irradiation Induced Multistage Martensitic Transformation in Ti‐Rich Ti-Ni Alloy
Electron Irradiation Induced Multistage Martensitic Transformation in Ti‐Rich Ti-Ni Alloy
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电子辐照诱导富钛钛镍合金多级马氏体相变
DOI：
10.1002/crat.202000035
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发表时间：
2020
影响因子：
1.5
通讯作者：
Wei Cai
中科院分区：
文献类型：
--
作者：
Yundong Zhao;Rui Ning;Zhiyong Gao;Haizhen Wang;Wei Cai
本文重点研究了电子辐照下钛镍（Ti-Ni）合金的微观结构和马氏体转变。辐照后显微结构无明显变化。在富Ti的Ti-48 at % Ni合金中观察到电子辐照后的异常多级马氏体相变。在加热过程中，辐照合金可以实现三阶段逆马氏体相变，而未辐照的对应物显示正常的一阶段相变。电子辐照引起的异常逆马氏体相变行为是由于局部应力场和过度的缺陷集中造成的。在250 °C退火后的马氏体相变行为和温度与未辐照的对应物一致。此外，经辐照的合金表现出比未经辐照的样品优越的上级热循环稳定性。
This paper focuses on the microstructure and martensitic transformation of titanium−nickel (Ti−Ni) alloys under electron irradiation. There is no observable change of the microstructure after irradiation. Abnormal multistage martensitic transformations are observed in Ti‐rich Ti‐48 at % Ni alloys after electron irradiation. The three‐stage reverse martensitic transformation can be achieved in the irradiated alloy, while unirradiated counterpart displays normal one‐stage transformation during heating processes. The abnormal reverse martensitic transformation behavior caused by electron irradiation is due to the local stress field and the excessive defect concentration. The martensitic transformation behavior and temperature after annealing at 250 °C are consistent with the unirradiated counterpart. Additionally, the irradiated alloy exhibits superior thermal cycle stability to unirradiated samples.