中文摘要：

介绍了钛镍铪高温形状记忆合金的研究进展，简述了钛镍铪合金的制备与加工方法，着重阐述了钛镍铪的相变特性、显微组织结构、单程及双程形状记忆效应、超弹性行为、机械特性和相应的微观机理，最后提出了需要进一步研究的问题。

英文摘要：

The research progress on Ti Ni-Hf high temperature shape memory alloy is reviewed. The fabrica tion and process method are briefly introduced. Additionally, phase transformation properties, microstructure, one- way and two-way shape memory effect, superelasticity behavior, mechanical properties and microscopic mechanism are focused oru Finally, key topics for further studies are pointed out.