通过示差扫描量热分析(DSC)研究了预应变及约束条件下TiNi形状记忆合金的温度记忆效应. 结果表明, 通过变形约束手段, 可以大大拓宽TiNi合金的相变温度区间,使得TiNi合金的温度记忆效应能够在一个非常大的温度范围内发挥作用; 同时, 变形并约束后TiNi合金的温度记忆效应比自由态TiNi合金的温度记忆效应更加准确. 分析表明, 马氏体与母相界面处的位错以及界面处的弹性自适应过程是可能的温度记忆效应机.
Temperature memory effect of a prestrained TiNi alloy under constraint condition was studied by differential scanning calorimetry (DSC). Results showed that the transformation temperature range of the TiNi alloy can be significantly enlarged upon prestraining and constrained heating, which makes the temperature memory effect operational also in an enlarged temperature window. Furthermore, the temperature memory effect of the prestrained and constrained TiNi alloy is more accurate than that of a TiNi alloy in free conditions. The dislocations at the interface between the parent phase and the remaining martensite, and the self--accommodating process near the interface are thought to be the mechanism for the temperature memory effect.
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