在573~723 K、0.001~1 s?1变形条件下研究均匀化态 Al?3.2Mg?0.4Er 铝合金的热变形行为。基于热压缩实验结果，构建综合考虑应变速率、变形温度和应变的唯象本构方程，同时建立再结晶动力学方程和塑性加工图。结果显示：所构建的本构模型能准确地预测 Al?3.2Mg?0.4Er 铝合金在热变形过程中的流变应力。再结晶组织的演变和再结晶体积分数可以由所建立的动力学方程以 S 曲线形式进行描述。此外，构建了合金在不同应变下的热塑性加工图，得到均匀化态 Al?3.2Mg?0.4Er 铝合金的较优加工条件为573 K、0.001 s?1及723 K、0.001~1 s?1.
The hot deformation behavior of the homogenized Al?3.2Mg?0.4Er aluminum alloy was investigated at 573?723 K under strain rates of 0.001?1 s?1. On the basis of compression experimental results, an accurate phenomenological constitutive equation that coupled the effects of strain rate, deformation temperature and strain was modeled. Furthermore, a kinetic model of dynamic recrystallization and processing map were also presented. The results show that the flow stress of the studied Al?3.2Mg?0.4Er alloy can be predicted accurately using the proposed constitutive model. The evolution of microstructure and the volume fraction of dynamic recrystallization can be described exactly in terms of S-curves with the proposed kinetic model. Moreover, the processing maps for hot working at different strains were constructed, suggesting the optimum processing conditions for this alloy are 573 K, 0.001 s?1 and 723 K, 0.001?0.1 s?1.
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