采用SHPB技术和可控速率循环加温条件下变形恢复量测定装置研究了冲击及静载变形后的TiNi形状记忆合金的单程及双程形状记忆特性。发现马氏体状态下的TiNi合金的力学特性显示出明显的应变率强化效应 ,并且高应变率压缩应力应变曲线呈现流动平台。应变率对形状记忆效应的影响具有双重性 ,当外加应力或残余应变较小 ,可逆非弹性变形机制起主导作用时 ,提高应变率可以增加其单程形状记忆效应 ;而随外加应力或残余应变增大 ,当基于位错机制的不可逆非弹性变形机制起主导作用时 ,应变率提高却抑制了其单程形状记忆效应。应变率对TiNi合金双程形状记忆效应的影响视塑性变形的大小而异 ,高应变率动载后的双程形状记忆效应在较小塑性应变时 ,比静载后的要强 ;但在较大塑性应变时两者差别不大 SHPB technology and deformation recovery measuring device under controlled rate and cyclic heating conditions were used to study the one-way and two-way shape memory properties of TiNi shape memory alloy after impact and static load deformation. It is found that the mechanical properties of TiNi alloy in the martensitic state show obvious strain rate strengthening effect, and the high strain rate compressive stress-strain curve presents the flow platform. The effect of strain rate on shape memory effect is twofold. When the applied stress or residual strain is small and the reversible inelastic deformation mechanism plays a leading role, increasing the strain rate can increase its one-way shape memory effect. With the increase of applied stress or residual strain Large, when the irreversible inelastic deformation mechanism based on the dislocation mechanism plays a leading role, the improvement of strain rate restrains its one-way shape memory effect. The effect of strain rate on the two-way shape memory effect of TiNi alloy depends on the size of plastic deformation. The two-way shape memory effect after high-strain-rate dynamic loading is stronger than that after static loading under small plastic strain. However, Plastic strain little difference between the two