应变率和应变历史对β+α双相铜基形状记忆合金力学行为的影响  

Influence of Strain Rate and Strain History on Mechanical Behaviors of β+α Two Phases Cu-Al-Zn Shape Memory Alloy

作　　者：王国平[1] 陈九磅[1] 龚明[2] 

机构地区：[1]合肥工业大学材料科学与工程学院,合肥230009 [2]中国科学技术大学中科院材料力学行为和设计重点实验室,合肥230026

出　　处：《金属功能材料》2009年第5期16-18,共3页Metallic Functional Materials

摘　　要：本文研究了不同应变率和应变历史对双相Cu-Al-Zn形状记忆合金的力学行为的影响。结果表明,在试验应变率0.001/s^0.1/s范围内,双相记忆合金抗拉强度Rm和断裂应变fε随应变率的增加而不变,呈现应变率不敏感性;实验结果还表明:随着加卸载次数的增加,弹性模量逐渐降低,经过一次较高应力的卸载之后,再次加载时应力应变曲线上伪弹性转变点被淡化。The influence of strain rate and strain history on mechanical behaviors was investigated for Cu-Al-Zn shape memory alloy of β＋α two phases. It has been found that the alloy is insensitive to strain rate within the test strain rates range from 0.001/s to 0. 1/s. Both tensile strength and fracture strain level do not change with the increase of stain rate. The experimental results also show that the elastic modulus of β＋α two phases alloy gradually decreases with the increase of loading and unloading cycles. The pseudo-elasticity transformation point in stress strain curve is weakened when reloading after a high stress loading and unloading.

关 键 词：β+α双相合金 力学行为 应变率 应变历史 

分 类 号：TG139.6[一般工业技术—材料科学与工程]