不同温度下拉伸对Cu-Zn-Al合金的伪弹性和形状记忆效应的影响

来源期刊：中南大学学报(自然科学版)1983年第3期

论文作者：李凯 曹明盛

文章页码：112 - 117

关键词：伪弹性； 形状记忆效应； 不同温度； 记忆合金； 拉伸试样； 马氏体相变； 弹性回复； 马氏体形成； 应变曲线； 临界值

摘    要：本实验采用工业纯金属制备Cu—Zn—Al记忆合金,用电测法测绘了该合金在马氏体相变点上下某些特性温度区间的σ—ε曲线,所得主要结果是:1.试样在A_f以上恒温拉伸,出现伪弹性效应,但是,当应变超过一临界值后就会丧失完全的伪弹性。2.试样在M_s—A_f之间拉伸,得不到完全的伪弹性,但仍以伪弹性回复为主。3.试样在M_s以下拉伸,发生马氏体再取向。再取向可产生伪弹性也可产生形状记忆效应。

Abstract: Commercial metals were used for preparing Cu-Zn-Al shape memoryalloys in this experiment. Stress-strain curves of the alloy at differenttemperatures were plotted with the aid of the electrometry. In addition, thesubstructural characteristics of specimens with different strain were ob-served and studied by TEM. The main results were as follows:1. The pseudoelasticity would appear in specimens deformed in tensionabove Af at a constant temperature. However, when the strain exceeded acritical value, the complete pseudoelasticity began to disappear. 2. Specimens, deformed in tension between Ms and Af at a constanttemperature, could not gain the complete pseudoelasticity, but pseudoelasticrecovery was still the principal way. 3. Martensitic reorientation would occur in specimens deformed in tensionbelow Ms at a constant temperature. There were two results for marte-nsitic reorientation, one for producing pseudoelasticity and the other foracquiring reoriented martensite variantswhich would produce shape memoryeffect after heated. 4. When specimens were deformed in tension at constant tempera-ture, the temperature of samples might go up. For test alloy on 1.6% strain witha speed of clamp of 5mm/min, the rise in temperature couldbe as many as 4℃.