Cu-Zn-Al合金中热弹马氏体稳定化原因的正电子湮没研究

A Study of Thermoelastic Martensite Stabilization by Positron Annihilation

用正电子湮没Doppler展宽能谱测量了一系列经不同热处理的Cu-23at％Zn-10at％Al合金试样。结果表明:在Cu基形状记忆合金热弹马氏体稳定化研究中所假设的诸多机制中,淬火空位是最根本的机制;了解淬火空位的运动特征和尽快地消除淬火空位是优化热处理工艺并得到理想记忆元件的基础。

A series of Cu-23%Zn-10at%Al alloy specimens subjected to different heat-treatment processes have been studied by means of Doppler broadening technique of positron annihilation combined with mechanical test. It is shown that the mechanism of quenched-ln vacancies. Instead of the other suggested ones, plays a dominant role in themoelastlc martenslte stabilization of Cu-based shape memory alloy. Knowing the char-acted of the movement of quenched-ln vacancies and eliminating them as rapidly as possible are the basis for further optimizing heat-treatment process to obtain desired shape memory performance.