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利用Gleeble-1500热模拟试验机对6111铝合金进行高温拉伸试验,研究了其在变形温度为350、450和550℃以及应变速率为0.1、1和10 s 1时的热变形行为.6111铝合金的流变应力随温度升高而减小,随应变速率增大而增大,其热变形从应变硬化阶段过渡到稳态变形阶段.建立了综合考虑应变、温度和应变速率对流变应力的影响以及耦合位错密度的统一黏塑性本构模型,并通过遗传优化算法求解出本构模型中的材料常数.模型计算得到的真应力-真应变曲线与试验数据吻合较好.
The hot deformation behavior of 6111 aluminum alloy was investigated by Gleeble-1500 thermal simulator at 350, 450 and 550 ℃ and strain rate of 0.1, 1 and 10 s 1. The flow stress of the alloy decreases with increasing temperature and increases with the increase of strain rate, and the thermal deformation of the alloy transforms from the stage of strain hardening to the steady state.A model is developed in which the strain, temperature and strain rate Influence and coupling dislocation density of the unified visco-plastic constitutive model, and genetic optimization algorithm to solve the constitutive model of the material constant calculated by the model of the true stress-true strain curve and the experimental data agree well.