热处理和冷变形对Ti—Ni合金非线性超弹性的影响

本文利用拉伸试验系统地研究了冷变形量、热处理工艺对Ｔｉ－４９．８％（原子分数）Ｎｉ合金非线性超弹性的影响。研究表明，不同冷变形量丝材经７２３Ｋ，０．５ｈ退火处理后，冷变形量较大的丝材（大于２０％）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，而冷变形量较小的丝材，即使经过多次应力－应变循环处理也难以获得完全的非线性超弹性。经同一温度退火处理的不同冷变形量丝材，冷变形量越大，获得完全非

The Effect of Heat-treatment and Cold Deformation on Non-linear Superelasticity of Ti-Ni Alloy

The effect of heat-treatmnt and cold deformation on non-linear superelasticity of Ti-49. 8at% Ni alloy has been studied by means of tensile test. When annealed at 723 K for 0. 5h after cold deformed to forve 20%, wires can obtain complete non-linear superelasticity after certain numbers of stress-strain cycles, whereas wires with Smaller cold deformation can not obtain complete non-linear superelasticity even after many stress-stain cycles. For wires an-nealed at the same temperaure, the greater the degree of cold deformation, the wider the temperature range showing complete non-linear superelasticity and the higher the superelastic strain is at the same tensile temperatuare. For wires with the same degree of cold deformaion, the temperature range showing complete non-linear superelasticity and the superelas-tic strain decreases with the increase of anneal temperaure.