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对具有两步完全热弹性的Ni53.2Mn22.6Ga24.2单晶的物性采用多种测量手段进行了表征,特别研究了不同温度下的应力-应变特性.研究表明,热诱发的中间马氏体相变应变远大于马氏体相变应变.在较低的形变温度下,沿单晶母相[001]方向的压应力诱发的是两步马氏体相变,材料表现出赝弹性;在较高的形变温度下,只能观察到一步马氏体相变,材料展现出完全超弹性特性.此外,利用热力学理论分别计算了诱发马氏体相变和中间马氏体相变的临界应力与形变温度的关系,与实验测量得到的结果相符.
The properties of Ni53.2Mn22.6Ga24.2 single crystal with two-step complete thermoelasticity were characterized by various measuring methods, especially the stress-strain characteristics under different temperatures. The results show that the heat-induced intermediate martensite The phase transformation strain is much larger than the martensitic transformation strain. At the lower deformation temperature, the compressive stress along the [001] direction of the single crystal mother phase induces two-step martensitic transformation and the material exhibits pseudo- At higher deformation temperature, only one-step martensitic transformation was observed and the material showed complete super-elastic properties.In addition, the critical stress induced martensite transformation and intermediate martensitic transformation were calculated by thermodynamic theory And deformation temperature, and the experimental results obtained by the match.