(中国科学院 金属研究所，沈阳 110016)
摘 要: 通过示差扫描量热仪、扫描电镜和电子试验机研究Ti43.5Ni47.0Nb9.0Zr0.5丝的相变、显微组织和记忆功能。结果表明：热拉态Ti43.5Ni47.0Nb9.0Zr0.5丝在室温至170 ℃的温度范围内观察不到相变发生，在750 ℃退火时，Ms点和As点分别为−107 ℃和−12 ℃；随着变形量的增加，逆马氏体相变温度大幅度升高，相变热滞变宽；当变形量为13%时，恢复应力达到最大值，为682 MPa，此时恢复应变为6.3%；恢复应力松弛曲线显示Ti43.5Ni47.0Nb9.0Zr0.5丝达到最大恢复应力后随温度的降低，恢复应力下降，在−20~−30 ℃范围内，恢复应力降至300 MPa以下。
关键字: Ti43.5Ni47.0Nb9.0Zr0.5合金；热拉；相变；记忆功能
Ti43.5Ni47.0Nb9.0Zr0.5 alloy
（Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China）
Abstract:The phase transformation, microstructure and memory function of Ti43.5Ni47.0Nb9.0Zr0.5 wire were studied by differential scanning calorimetry, scanning electronic microscopy and electronic tensile machine. The results show that phase transformation of hot-drawn Ti43.5Ni47.0Nb9.0Zr0.5 does not appear between room temperature and −170 ℃. After annealing at 750 ℃, Ms is −107 ℃, and As is −12 ℃. The reverse transformation temperature increases quickly and transformation hysteresis becomes wide with increasing deformation. The recovery stress reaches the maximum value of about 682 MPa with deformation of 13%, and the recovery strain is 6.3%. The curve of recovery stress relaxation indicates that the recovery stress begins to drop with decreasing temperature after the maximum recovery stress appear, the recovery stress is lower than 300 MPa between −20 ℃ and −30 ℃.
Key words: Ti43.5Ni47.0Nb9.0Zr0.5 alloy; hot-drawing; phase transformation; memory function
