(1. 江苏大学 材料科学与工程学院，镇江 212013；
2. 镇江忆诺唯记忆合金有限公司，镇江 212009)
摘 要: 通过对TiNiCr形状记忆合金丝施加不同的预变形，利用拉伸实验和光学显微镜研究不同预变形对TiNiCr形状记忆合金超弹性和显微组织的影响。结果表明：预变形对TiNiCr形状记忆合金弹性有着显著的影响，TiNiCr合金弹性随着变形量的增加而增加，当变形量达到51.4%时，弹性的增加不明显，单纯的预变形不能使TiNiCr达到完全的非线性超弹性，但会使TiNiCr产生一种细小板条状且高度形变的马氏体变体；当变形量达到48.6%时，马氏体变体的体积明显增大，极大地提高了母相的强度，从而显著提高TiNiCr丝的弹性。
关键字: TiNiCr；预变形；形状记忆合金；非线性超弹性；马氏体
TiNiCr shape memory alloy
（1. School of Materials Science and Engineering, Jiangsu University, Zhenjiang 212013, China;
2. Zhenjiang Innov Alloy Co. Ltd., Zhenjiang 212009, China）
Abstract: The effect of the different pre-deformation on superelasticity and microstructure of TiNiCr shape memory alloy was studied by means of tensile test and optical microscope. The results show that the effect of the pre-deformation on superelasticity is obvious. The superelasticity becomes better with the growing pre-deformation. When the deformation reaches 51.4%, the growing rate of superelasticity gets slow. The pre-deformation cannot make TiNiCr obtain complete non-linear superelasticity, but make a kind of fine and highly deformed martensite in TiNiCr. When the deformation reaches 48.6%, the martensite grows with the growing deformation, which increases the intensity of generatrix and the superelasticity of TiNiCr shape memory alloy.
Key words: TiNiCr; pre-deformation; shape memory alloy; non-linear superelasticity; martensite
