摘要
本文简要报道了采用新型SMT-1型形状记忆合金特性综合测试仪对Ti-50.9at％Ni合金在拉伸变形,形状记忆回复以及约束应力或约束应变条件下的力学和电阻特性进行测试的部分结果,并讨论了其内在物理本质。实验结果表明:拉伸加载过程中的电阻——应变曲线比应力——应变曲线更能揭示应力诱发马氏体相变过程;合金形状记忆效应的回复温度随拉伸应变量的增加而增加;在约束应变条件下,合金回复应力及它随温度上升的趋势与初始应变量有关;应力约束条件下,马氏体相变所对应的应变量比无外加应力作用时有大幅度增加。本研究也表明:应力,应变,电阻,温度的同步测量是研究形状记忆合金性能和组织结构变化的简便和有效的工具。
By using a new synthetical characteristic instrument SMT -1 the mechanical and electrical resistance of a TiNi shape memory alloy during loading and recovery process and under a restrained (stress or strain) condition have been studied, and the physical essence has been discussed. The results show that the electrical resistance - strain curve on loading reveals that the stress induced maHensitic phase transformation more clearly than stress - strain curve. The recovery temperature increases with the increasing of tensile strain. The recovery stress - temperature curve under a restrained strain condition depends on the value of the strain. The strain value produced by manensitic phase transformation under a constant stress is larger than that without a constrained stress. The results also show that the synthetical measurement of stress, strain, electrical resistance, and temperature is a very effective and reasonable method to study the properties and structure of shape memory alloys.
出处
《上海钢研》
2000年第4期7-13,共7页
Journal of Shanghai Iron and Steel Research
关键词
TINI形状记忆合金
力学性能
电阻
shape memory alloy mechanical property electrical resistance synthetical measurement
