本项目针对TiNi合金在空间使役环境可靠性评价的迫切需求，开展高速撞击TiNi合金马氏体相变、微观组织结构及应变恢复特性研究。在建立不同相状态TiNi合金高速撞击本构方程基础上，阐明高速撞击TiNi合金能量吸收特性，探明高速撞击TiNi合金应力场和温度场的分布特征及影响因素；研究高速撞击TiNi合金不同区域变形组织微观结构特征，建立变形特征区域划分准则，揭示高速撞击时合金变形特征组织区域化的微观机理；查明不同变形特征组织的马氏体相变行为及应变恢复特性，建立撞击参量—变形组织特征—应变恢复特性的内在联系，为TiNi合金空间使役环境可靠性评估奠定基础。

Aiming at the urgent demand for reliability assessment of TiNi alloy working in space, this project is going to conduct researches about martensitic transformation, microstructure and strain recovery properties of TiNi alloy under high speed impact. This project is going to illustrate the energy absorbing property, distribution and influencing factors of stress field and temperature field and microstructure of different deformation zones of TiNi alloy under high speed impact, on the basis of building high speed impact constitutive equation of TiNi alloy at different phases. Division principles of characteristic deformation areas are going to be established. Micro-mechanism of regionalization of characteristic deformation areas will also be illustrated. Martensitic transformation behavior and strain recovery property of different deformation areas are going to be figured out while building inter connection of impact parameters, characteristic of deformation microstructure and strain recovery property. All the works above is to lay the foundation of reliability assessment of TiNi alloy working in space.