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

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.