Analysis of unsolved phenomena and development of new function in Ti-Ni shape memory alloy

在Ti-Ni形状记忆合金的物理冶金领域，主要存在以下5个尚未解决的问题；B19′马氏体自调节的形貌和结晶学、<011>_<B19>的界面结构、II型孪晶、B19′马氏体反相组织的结晶学、时效Ti-Ni合金多阶段马氏体转变的机理以及B2母相异常延展性与晶界组织的关系。这些问题已经用新的电子显微镜技术进行了研究。其中一个值得注意的结果是自适应的系统化为<111>_<B2>附近哈比平面变异的聚类。

There are mainly five unsolved problems in the physical metallurgy field of Ti-Ni shape memory alloys as follows ; Morphology and crystallography of self-accommodation in B19' martensite, interface structure of <011>_<B19>, type II twin, crystallography of anti-phase like structure in B19' martensite, mechanism of multistage martensitic transformation in aged Ti-Ni alloys and relation between anomalous ductility and grain boundary structure of B2 parent phase. These problems have been investigated by novel electron microscopy techniques. One of notable results is systematization of self-accommodation as clustering of habi plane variants around <111>_<B2>.