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tini形状记忆合金在定应变约束下的马氏体相变

Keywords: tini形状记忆合金,马氏体相变,回复应变

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Abstract:

?通过dsc及回复应变的测量,研究了定应变约束态加热-冷却过程对预应变tini形状记忆合金相变行为的影响.结果表明,在约束态相变中,逆相变温度区间拓宽;取向马氏体除向母相转变外,应变还要进一步增大;在正相变过程中,从母相生成的马氏体也具有变形结构.约束态不完全相变后,样品中存在两种马氏体:再变形马氏体和继承变形马氏体.在随后的无约束逆相变过程中,前者的相变温度高于后者,并且输出两段回复应变.

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