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首页> 外文期刊>Materials Science and Engineering >Constitutive descriptions and microstructure evolution of extruded A5083 aluminum alloy during hot compression
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Constitutive descriptions and microstructure evolution of extruded A5083 aluminum alloy during hot compression

机译：挤压A5083铝合金热压缩的本构描述和微观组织演变。

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摘要

The deformation behavior and microstructure evolution of extruded A5083 aluminum alloy were studied by performing hot compression tests at deformation temperatures ranging from 350 degrees C to 500 degrees C and strain rates ranging from 0.01 s(-1) to 50 s(-1). Inverse analysis was used to reduce the effects of inhomogeneous distributions of deformation and temperature on the flow curves. On the basis of the obtained flow curves, a set of constitutive equations was modeled to describe the deformation behaviors, and these equations can be regarded as the "material genome" as they provide a fundamental understanding of material behaviors during deformation. A model was developed to predict the flow stress under the entire range of experimental conditions. Error analysis verified the reliability of the model and confirmed it to be effective in predicting the flow stress. Microstructure observations confirmed dynamic recrystallization occurred. Besides, particle-stimulated nucleation was also observed, verifying that large particles can promote dynamic recrystallization. The effects of temperature and strain rate on microstructure evolution were analyzed. The relations between deformation behavior, microstructure and mechanical property were also discussed, the good correlation shows a possibility of controlling microstructure and mechanical property by selecting suitable forming parameters.
机译：通过在350℃至500℃的变形温度和0.01 s（-1）至50 s（-1）的应变速率下进行热压缩试验，研究了挤压的A5083铝合金的变形行为和微观组织演变。使用反分析来减少变形和温度的不均匀分布对流动曲线的影响。根据获得的流动曲线，对一组本构方程进行建模以描述变形行为，这些方程可被视为“材料基因组”，因为它们提供了变形过程中材料行为的基本理解。开发了一个模型来预测整个实验条件下的流动应力。误差分析验证了该模型的可靠性，并确认了该模型对于预测流应力有效。显微组织观察证实发生了动态重结晶。此外，还观察到颗粒刺激的形核，证明大颗粒可以促进动态重结晶。分析了温度和应变速率对组织演变的影响。讨论了变形行为，显微组织和力学性能之间的关系，良好的相关性表明通过选择合适的成形参数来控制显微组织和力学性能的可能性。

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