(中国科学院 金属研究所，沈阳 110016)
摘 要: 通过示差扫描量热仪、电子拉伸机研究热处理对温拉拔态Ti-49.8%Ni合金丝相变、拉伸性能和记忆效应的影响。结果表明：在低于450 ℃进行热处理，合金丝降温时发生独立的R相变和马氏体相变；热处理温度达到500 ℃，在降温过程中R相变消失，只发生马氏体相变。温拉拔态合金丝室温抗拉强度超过1 540 MPa。与马氏体相比，合金丝在母相状态下变形能够获得更高的恢复应变和恢复应力，母相状态下变形量达到12%时恢复应变超过8%；变形量16%时恢复应力为602 MPa。
关键字: TiNi合金；温拉拔；热处理；拉伸性能；恢复应变；恢复应力
（Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China）
Abstract:The effects of the heat treatment on transformation, tensile property and shape memory effects for Ti-49.8Ni warm-drawn wire were investigated by differential scanning calorimeter (DSC) and electronic tensile machine. The results show that R phase and martensitic phase transformations have occurred respectively during cooling course when the heat treatment temperature is lower than 450 ℃, and A→M transformation happens without A→R transformation on cooling course when the heat treatment temperature came up to 500 ℃. The tensile strength exceeds 1 540 MPa for the warm-drawing alloy wire. The recovery strain and the recovery stress are higher than those of the martensitic phase, when deformed at austenitic phase stage, the recovery strain exceeds 8% with deformation amount of 12%, and the recovery stress reaches 602 MPa with deformation amount of 16%.
Key words: TiNi alloy; warm-drawn; heat treatment; tensile properties; recovery strain; recovery stress
