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基于实验室自制的Al-1.2Cu-0.5Mg合金单晶材料,开展了不同应力水平下的应力时效试验和相应的透射电镜组织分析(TEM),并结合3种不同理论模型模拟研究了Al-1.2Cu-0.5Mg单晶经压缩应力时效和人工时效后析出相的分布规律与析出相取向分布作用机制。结果表明:在压应力作用下,Al-1.2Cu-0.5Mg合金单晶的时效析出相出现了显著的取向分布规律,且具有不同晶体取向的单晶在同样的压应力作用下时效后析出相分布取向程度差别明显;3种理论模型中,同时考虑应力与位错耦合作用的模型预测结果与实测结果相符,证明析出相的取向效应既有析出相-应力弹性交互作用促进机制,也有促进析出相均匀形核的位错抑制机制。
Based on the laboratory-made Al-1.2Cu-0.5Mg alloy single crystal materials, the stress aging tests and the corresponding transmission electron microscopy (TEM) under different stress levels were carried out. Combined with three different theoretical models, the Al- 1.2Cu-0.5Mg single crystal after compressive stress aging and artificial aging precipitation phase distribution and the precipitated phase orientation distribution mechanism. The results show that under the action of compressive stress, the Al-1.2Cu-0.5Mg alloy single crystal precipitation appeared significant distribution of the law, and with different crystal orientation of single crystal under the same compressive stress aging precipitated phase The results show that the orientation effect of precipitation phase has the promotion mechanism of both precipitation phase and stress-elastic interaction as well as the mechanism of promoting precipitation Dislocation suppression mechanism of homogeneous nucleation.