TiNi基形状记忆合金马氏体相变预现象研究进展

Research Progress of Martensite Transformation Pre-phenomen on in TiNi-based Shape Memory Alloys

深入了解TiNi基形状记忆合金中特定马氏体相及复杂的多步相转变出现的原因,掌握TiNi基合金的马氏体相变规律,是开发和应用TiNi基形状记忆合金的前提.从弹性常数软化、声子软化及漫散射3个方面阐述了TiNi基形状记忆合金中的马氏体相变预现象,并将之与应变玻璃现象相区分.最后指出了TiNi基形状记忆合金马氏体相变的研究方向.

In-depth understanding of the reasons why specific martensites and complicated multi-step phase transformations in TiNi-based shape memory alloys appear, and grasping of the law of martensitic transformation in TiNi-based alloys are the prerequisite for development and application of TiNi-based shape memory alloys. From the aspects of elastic constant softening, phonon softening and diffuse scattering, the premartensitic precursor phenomena in TiNi-based shape memory alloys are described. And it is also distinguished from strain glass. Finally, the research directions of martensitic transformation in TiNi-based shape memory alloys are pointed out.