通过恰当的成分设计,可得到具有较高马氏体相变温度及较宽相变滞后的Cu-Al-Mn形状记忆合金.用DSC(differential scanning calorimetry)及差热分析法测得:Cu-13.5Al-2.5Mn-1.36Zn合金的M*点(降温时马氏体相变最激烈的温度)为250℃;淬火后相变滞后宽度达到167℃.此合金具有良好的单向形状记忆效应,在表面应变为4%时,淬火态弯曲变形试样的形状回复率达95%,马氏体态长期时效对其影响不大,淬火后室温下(马氏体态)时效2年,弯曲变形试样的形状回复率达90%.室温淬火后,合金的力学性能指标如下:抗拉强度约250MPa,伸长率约7%,硬度为190HB.这种合金具有性能稳定、可用温度及时间范围较宽、力学性能较好等特点.
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