TiNi基形状记忆合金的辐照效应

材料辐照效应是入射粒子与物质交互作用造成的物质微观组织结构与宏观性能的变化。辐照效应不仅是改善材料表面性能的重要手段,而且也是特殊环境应用材料可靠性评价的重要组成部分。TiNi基形状记忆合金是一种重要的金属智能材料,具有独特的形状记忆效应和超弹性,已在卫星、空间站等航天器以及生物医学中广泛应用。本文阐述了Ti-Ni基形状记忆合金在空间粒子(质子、电子)以及离子辐照改性的研究进展,辐照效应会对TiNi合金的微观组织结构产生影响,进而改变合金的相变行为和力学行为。然而目前关于TiNi基合金的辐照效应的研究仍处于起步阶段,组织结构和相变行为的变化规律和机理还未研究清楚,有关形状记忆效应的研究较少,仍需深入研究辐照参数、组织结构、相变行为和功能特性之间的内在联系。

Irradiation effect of TiNi based shape memory alloys

The irradiation effect is the change of microstructure and macroscopic properties caused by the interaction between incident particles and materials.Irradiation effect is not only an important method to modify the surface of materials,but also an essential part of the reliable evaluation of materials applied in special environment.The TiNi based shape memory alloy is a kind of important intelligent material,which has the unique shape memory effect and superelasticity and can be widely used in spacecraft such as satellites,space stations and biomedical science.The spacecraft will be irradiated by charged particles mainly including protons,electrons and ions.The irradiation effect can influence the microstructure of TiNi based shape memory alloy,which will change the phase transformation and mechanical behavior.However,the current investigation in irradiation effect of TiNi based shape memory alloy is still in its infancy.The change rules and mechanism of microstructure and phase transformation have not been studied clearly.And there are few studies on the effect of irradiation on the shape memory effect have been carried out.In-depth study on the irradiation parameters,microstructure,phase transformation behavior and functional properties is still needed.