(1. 中南大学 材料科学与工程学院, 长沙 410083;
2. 合肥工业大学 材料科学与工程学院, 合肥 230009)
摘 要: 利用金相显微镜、 透射电镜、 扫描电镜观察和力学性能测试等手段研究了Cu-18.4Al-8.7Mn-3.4Zn-0.1Zr（摩尔分数， %）记忆合金（多晶）在不同温度与组织下变形时的力学行为。 实验合金在不同温度下变形时延伸率不同，变形温度（Td）在Ms与Af之间时的延伸率小于变形温度（Td）高于Af时的延伸率。 对实验合金施加应力时， 最初的变形主要来自应力诱发马氏体，继而发生马氏体变体择优合并， 二者对合金的变形都有贡献； 变形量更大时， 变体界面共格性被破坏， 部分马氏体丧失热弹性。 少量α相的析出不影响记忆效应， 可使延伸率得以提高。
关键字: Cu-Al-Mn-Zn-Zr记忆合金； 应力诱发马氏体； 延伸率
mechanical behavior of CuAlMnZnZr
shape memory alloy
（1. School of Materials Science and Engineering,
Central South University, Changsha 410083, China;
2. School of Materials Science and Engineering,
Hefei University of Technology, Hefei 230009, China;）
Abstract:Mechanical behavior of CuAlMnZnZr shape memory alloy with different microstructures deformed at different temperatures was studied by means of optical microscopy, scanning fracture morphology, TEM observation and the mechanical property measurement. The elongations are different when the tested alloy are deformed at different temperatures. Under the stress, the original deformation derives from the stress-induced martensite, and then the stress-induced martensite takes preferential merger. With the increase of the deformation, the coherent boundaries between the variants are destroyed, a part of the stress-induced martensite lose the thermoelasticity. The precipitation of minor α phase which has little effect on its shape memory effect can enhance its elongation .
Key words: Cu-Al-Mn-Zn-Zr shape memory alloy; stress-induced martensite; elongation
