【摘要】 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.更多还原

【Abstract】 A model for the interfacial energy between theΩ-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.更多还原