During the solution heat treatment (SHT) process of aluminum alloys, precipitates dissolve into the matrix. To predict the dissolution time, modeling of isothermal dissolution of precipitates in 6061 aluminum alloy during SHT was conducted. A precipitate dissolution model was established, and the flowchart of the modeling was designed as well. Then the explicit finite-difference method was employed to solve the dissolution model, and the mobile nodes method was used to deal with the moving interface. The simulation was based on real precipitates in 6061, and SHT experiments were conducted to validate the numerical model. The simulation results showed that the isothermal dissolution time of precipitates in 6061-T6 aluminum alloy at 560 °C is 11.6856 s. The dissolution time in the simulation was close to the experimental results, with an error of 16.7%, indicating that the modeling in this study was fairly reasonable and accurate. The error was caused by many factors, and the model should be improved.

中文翻译：

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固溶热处理过程中 6061 铝合金板中沉淀物的等温溶解模拟

在铝合金的固溶热处理 (SHT) 过程中，沉淀物溶解到基体中。为了预测溶解时间，进行了 SHT 过程中 6061 铝合金中析出物等温溶解的建模。建立了沉淀溶解模型，并设计了建模流程图。然后采用显式有限差分法求解溶解模型，采用移动节点法处理移动界面。模拟基于 6061 中的真实沉淀，并进行了 SHT 实验以验证数值模型。模拟结果表明，6061-T6铝合金中析出物在560 ℃下的等温溶解时间为11.6856 s。模拟中的溶解时间与实验结果接近，误差为16。7%，表明本研究中的建模相当合理和准确。造成误差的因素较多，模型有待改进。