6111铝合金固溶工艺多目标优化Multi-objective optimization of solution process of 6111 aluminum alloy

利用电子拉伸试验机和维氏硬度计测试不同固溶处理后6111铝合金板的抗拉强度、伸长率和维氏硬度，以固溶温度和固溶时间为自变量，采用响应面模型对抗拉强度、伸长率和维氏硬度进行拟合，并对其进行单目标优化。结果表明：固溶处理工艺参数分别为(540.8 ℃, 31.8 min)、(496.6 ℃, 1.0 min)、(540.6 ℃, 32.0 min)时，抗拉强度、伸长率和维氏硬度达到最大，分别为299.12 MPa、24.95%和106.62；应用第二代非支配排序遗传算法，对多个响应面模型进行优化求解，得到多目标优化模型的Pareto解集，从中可选择使铝合金板综合力性能较好的解，进而获得对应的固溶工艺参数。

The tensile strength, elongation and Vickers hardness of 6111 aluminum alloy samples after different solution treatment were measured by using the electronic tensile testing machine and the Vickers hardness tester. The data of tensile strength, elongation and Vickers hardness were fitted by response surface methodology, using solution temperature and solution time as independent variables. The optimization results of single-objective show that the tensile strength, elongation and Vickers hardness reach the maximum, when the solution treatment process parameters are (540.8 ℃, 31.8 min), (496.6 ℃, 1.0 min) and (540.6 ℃, 32.0 min), respectively, and the values of the tensile strength, elongation and Vickers hardness are 299.12 MPa, 24.95% and 106.62. Optimization of response surface models are solved by non-dominated sorting genetic algorithm Ⅱ (NSGA-Ⅱ), and the Pareto solutions of multi-objective model are obtained, within which the solutions of better performance of aluminum alloy can be selected, and the corresponding solution process parameters are gained simultaneously.

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