利用内耗研究淬火空位对Cu-11.9Al-2.5Mn(wt%)形状记忆合金逆马氏体相变温度的影响

利用内耗手段研究了淬火空位的演变行为及其对Cu-11.9Al-2.5Mn(wt%)形状记忆合金逆马氏体相变温度的影响.通过对不同冷却方式的样品研究表明，较高的冷却速度可以导致较高的逆马氏体相变峰峰温.而对于水淬样品，相变峰峰温随淬火温度呈非单调变化行为，这可能与有序相及无序相中不同的空位形成能有关.经历热循环以后，逆马氏体相变峰峰温显著降低. 关键词： 形状记忆合金 热处理 马氏体相变 阻尼

Effects of quenched-in vacancies on the reverse martensitic phase transformation temperature of the Cu-11.9Al-2.5Mn(wt%) shape memory alloy studied by internal friction

By internal friction technique，the behaviors of quenched-in vacancies and their influence on the reverse martensitic phase transformation (MT) temperature of the Cu-11.9Al-2.5Mn (wt%) shape memory alloy have been studied. Investigations on the specimens subjected to various cooling regimes indicate that rapid cooling rate leads to relatively high reverse MT temperature. For the water-quenched specimens，the reverse MT temperature bears a non-monotonic relationship to quenching temperature. This phenomenon may be related to the different formation energies of vacancies in ordered and disordered phases.