利用透射电镜和硬度测量实验手段,研究了多相Al-Zn-Mg-Cu合金在强烈塑性变形中的组织和性能变化,特别是析出相的改变.结果发现:强烈塑性变形加工可引起析出相变形、碎化,然后溶入基体形成过饱和固溶体.这种合金在重新时效处理时可再次沉淀析出.提出了析出相回溶现象的"畸变自由能"观点.认为因晶格畸变导致析出相自由能显著升高,当高于基体相的自由能时,便会发生析出相室温溶解的自发过程,称此过程为应变回归以区别于由热处理时加热引起的回归.
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