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以铝合金时效强化动力学为理论基础,研究了时效处理工艺参数对7A04铝合金组织和性能的影响,得到了优化的分级时效工艺。在此基础上,建立了时效强化相类型、尺寸、体积分数与铝合金屈服强度关系的计算模型;给出了固溶强化、弥散强化对铝合金屈服强度影响的统一表达式;并利用该模型对7A04高强铝合金单级时效和二级时效处理后的屈服强度进行了预测。计算结果表明,在达到最大时效强度前,屈服强度计算结果与实验测量结果基本一致;此后,由于强化相体积分数计算偏差增加,屈服强度计算的准确度有所下降。
Based on the theory of aging strengthening kinetics of aluminum alloy, the effect of aging treatment parameters on the microstructure and properties of 7A04 aluminum alloy was studied, and an optimized classification aging process was obtained. On this basis, the calculation model of the relationship between the type, size, volume fraction and the yield strength of the aluminum alloy is set up. The unified expression of the effect of solution strengthening and dispersion strengthening on the yield strength of the aluminum alloy is given. The yield strength of 7A04 high strength aluminum alloy after single stage aging and secondary aging treatment was predicted. The calculated results show that the calculated results of the yield strength agree well with the experimental results before the maximum aging strength is reached. Since then, the calculation accuracy of the yield strength decreases due to the increase of the calculation deviation of the volume fraction of the reinforcing phase.