研究了马氏体再取向(MR)和应力诱发马氏体转变(SIM)两种不同变形方式对Ni50.2Ti49.8合金拉伸性能及预应变后加热回复特性的影响.结果表明:拉伸变形中,MR变形方式的应力平台结束时的应变值较SIM变形方式大.在拉伸预应变处于应力平台阶段时,两种变形方式在相同预应变后加热回复有相同的记忆能力;在拉伸预应变大于应力平台时,两种变形方式在相同预应变后加热回复,SIM变形方式的逆相变温度和回复应变略高于MR变形方式.
Effects of two different deformation manners, martensite reorientation (MR) and stress-induced martensitic transformation (SIM) on the tensile properties and recovery properties after pre-strain of Ni50.2Ti49.8 alloy were investigated. Results show that the strain deformed via MR is higher than that via SIM at the end of the stress plateau in the tensile deformation process. When tensile pre-strain is in the stress plateau, the two manners after the same pre-strain followed by heating have the same recovery properties; however, when the tensile pre-strain is higher than stress plateau, SIM has higher reversed transformation temperatures and recovery strain than MR after the same pre-strain followed by heating.
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