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对成分一定的铜基形状记忆合金 (Cu-Mn-Al-Zn)制成的试样进行热处理以后 ,在室温下进行不同程度的拉伸变形 ,测定其电阻 -温度曲线并进行显微金相分析。结果显示 ,随着拉伸变形量的增大 ,在试样的组织中出现了由新旧变体形成的交叉组织 ,它的出现破坏了马氏体的自协调效应 ,导致了马氏体的稳定化 ,从而使其相变滞后宽度亦随之增大
A sample made of a copper-based shape memory alloy (Cu-Mn-Al-Zn) having a constant composition was subjected to heat treatment and then subjected to different degrees of tensile deformation at room temperature. The resistance-temperature curve was measured and subjected to microscopic metallography analysis. The results show that with the increase of tensile deformation, the cross-sectional structure formed by the old and new variants appears in the microstructure of the specimen. Its appearance destroys the self-coordination effect of martensite and leads to the stabilization of martensite Therefore, the width of phase lag is also increased