预变形量和热与应变循环对CuZnAl合金形状记忆性能的影响  

Effect of Pre-strain and Thermal-strain Cycle on the Shape Memory Effect of CuZnAl Alloy

作　　者：李宁[1] 黄姝珂[1] 莫华强[1] 胥永刚[1] 

机构地区：[1]四川大学制造科学与工程学院,四川成都610065

出　　处：《四川大学学报（工程科学版）》2005年第3期73-76,共4页Journal of Sichuan University (Engineering Science Edition)

基　　金：高等学校博士学科点专项科研基金(20030610093)

摘　　要：为了提高CuZnAl合金应用过程中的稳定性和使用寿命,研究Cu-26.87%(wt)Zn-3.85%(wt)Al合金在模拟使用条件下,预变形量和反复的变形加热过程(热与应变循环)对其形状记忆性能的影响。实验结果表明,合金的形状回复率η随着预变形量ε的增加几乎线性下降,ε高达17.7%时,η仅为35%。因此实际应用时,应尽量降低预变形量ε,以便获得较好的形状回复。热与应变循环过程中,刚开始合金的形状回复率η下降较快,随后逐渐趋于稳定,因此将合金预先进行热与应变循环10次左右,可提高其实际应用时的稳定性。In order to improve the stability and useful life of CuZnAl shape memory alloys (SMA), the influence of pre-strain and thermal-strain cycle on the shape memory effect (SME) of Cu-26.87%(wt)Zn-3.85%(wt)Al were studied. The results showed that with the increase of pre-strain, the SME of specimens decreases linearly. The alloy's η is only 35% when e is 17.7%. In the process of thermal-strain cycles, the SME of specimens decreases quickly at first and decreases slowly later and then becomes stable. The alloy can be cycled 10 times to improve its stability.

关 键 词：形状记忆合金 CuZnAl预变形量 热与应变循环 

分 类 号：TG139.6[一般工业技术—材料科学与工程] TG151[金属学及工艺—合金]