通过模型预测和对实验结果的拟合, 建立了Ω析出相与基体的界面能模型. 在此基础上, 根据伪二元假设和经典形核和长大理论, 建立了动力学析出物理模型, 预测欠时效态高Cu/Mg比Al--Cu--Mg--Ag合金在热暴露过程中析出相的演变和拉伸屈服强度. 在165℃欠时效处理2 h的Al--Cu--Mg--Ag合金在不同温度(150--250℃) 热暴露不同时间(0--1000 h)后, 对其析出相组织和拉伸性能进行实验验证. 结果表明, 预测结果与实验结果吻合较好, 验证了模型的可靠性.
A model for the interfacial energy between the Ω–phase precipitation and matrix was established by both the model prediction and experimental result fitting. Based on the pseudo–binary assumption and classical nucleation and growth theories, a physical model for thermodynamic precipitation was also developed, and by which, the microstructural evolution and tension yield strength of the underaged Al–Cu–Mg–Ag alloy were predicted. The results indicated that the results predicted are in good agreement with the experimental data.
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