通过恰当的成分设计,获得了具有较低马氏体相变温度及较宽相变滞后的Cu-Al-Mn-Nb形状记忆合金.用差热分析法(DSC)测得Cu-26.8Al-4.8Mn-1.0Nb(摩尔分数,%)合金在降温时马氏体相变最激烈的温度为-32℃;升温时奥氏体相变最激烈时的温度为68℃;相变滞后宽度达100℃.透射电镜、扫描电镜及X射线衍射分析表明,该合金的马氏体为2H型结构,宽滞后效应是由于合金进行马氏体相变时析出了点状富铌颗粒从而松驰掉一部分弹性应变能而产生的.该合金在表面应变为4%时,弯曲变形试样的形状回复率达93%以上,在室温下时效2个月后,其形状回复率没有发生明显恶化.室温下其抗拉强度约为550 MPa,屈服强度约为380 MPa,塑性延伸率约为7%.
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