In-situ deformation of Ni rich NiTi shape memory alloy is characterized using synchrotron diffraction. The changes in the texture of austenite and martensite phases as a function of applied stress were systematically investigated. Development of large elastic stresses with a concomitant plastic deformation have been found to restrict the stress induced martensitic transformation. A strong lattice correspondence between the austenite and martensite phases along with a strong variant selection is reported. Further, based on the inclination of the austenite orientations to the applied loading axis, stress induced martensitic transformation or dislocation slip is activated at higher stress. This leads to the strengthening of texture components of the austenite phase and a strong variant selection in the martensite phase.

使用同步加速器衍射表征富镍 NiTi 形状记忆合金的原位变形。系统地研究了作为外加应力函数的奥氏体和马氏体相的织构变化。已经发现伴随塑性变形的大弹性应力的发展限制了应力诱发的马氏体转变。据报道，奥氏体和马氏体相之间的晶格对应性很强，并且有很强的变体选择。此外，基于奥氏体取向对施加的加载轴的倾斜，应力诱导的马氏体转变或位错滑移在更高的应力下被激活。这导致奥氏体相的织构成分增强和马氏体相中的强变体选择。