论文部分内容阅读
利用拉伸试验系统研究了应力应变循环对Ｔｉ４９．８ａｔ％Ｎｉ合金非线性超弹性的影响。冷变形＋退火处理的Ｔｉ４９．８ａｔ％Ｎｉ合金丝材经一定次数的应力应变循环处理后，可获得完全的非线性超弹性，随后随着应力应变循环次数的增加，应力诱发马氏体临界应力与非线性超弹性应变量均下降，当应力应变循环达到一定次数，丝材的非线性超弹性性能将达到稳定。并且，经不同工艺处理的Ｔｉ４９．８ａｔ％Ｎｉ合金丝材的非线性超弹性受应力应变循环的影响并不相同。应力应变循环对经４５０℃、０５ｈ退火处理的冷变形量为３８４％丝材的非线性超弹性影响较小。
The tensile test system was used to study the effect of stressstrain cycling on the nonlinear hyperelasticity of Ti49.8 at% Ni alloy. Cold deformation + annealed Ti 49.8at% Ni alloy wire after a certain number of stress strain cycle treatment, can be completely nonlinear super-elastic, and then with the stress-strain cycle number increases, stress-induced horse The critical stress and the nonlinear super-elastic strain of the austenite decrease. When the stress-strain cycle reaches a certain number of times, the nonlinear super-elastic properties of the wire will be stabilized. Moreover, the nonlinear hyperelastic stress-strain cycles of Ti49.8 at% Ni alloy wire treated by different processes are not the same. The stress-strain cycle has less effect on the nonlinear hyperelasticity of the wire with the cold deformation of 384% after being annealed at 450 ℃ for 0.5h.