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求解了高Cu/Mg比的Al-Cu-Mg-Ag合金峰值时效前微观结构演变及时效强化的预测模型。首先,建立影响Mg与Mg-Ag原子簇对Ω相析出过程中消耗Cu原子定量关系的关键参数表达式,即Ω析出相与基体的界面能模型。在假设合金为伪二元的前提下,基于热动力学模型和经典的形核、长大理论,建立了Al-Cu-Mg-Ag合金中Cu溶质原子在两种强化相中的定量分配模型,它可以预测两种强化粒子的半径和析出密度、溶质浓度随温度和时间的演变。最后求解了基于Orowan方程的强化模型。模型预测与实验结果吻合较好,证明了模型的可靠性。
The microstructure evolution and aging strengthening model of Al-Cu-Mg-Ag alloy with high Cu / Mg ratio before peak aging were solved. First of all, a key parameter expression that can affect the quantitative relationship between Cu and Mg atoms consumed during the precipitation of Ω phase is established, that is, the interfacial energy model between Ω precipitation phase and the matrix. Based on the assumption that the alloy is pseudo-binary, based on the thermodynamic model and classical nucleation and growth theory, the quantitative distribution model of Cu solute atoms in Al-Cu-Mg-Ag alloys , It can predict the radius and precipitation density of two kinds of strengthening particles, the evolution of solute concentration with temperature and time. Finally, the reinforcement model based on Orowan equation is solved. The model prediction is in good agreement with the experimental results, which proves the reliability of the model.