Microstructure Evolution and Dynamic Recrystallized Model of 5083 Aluminum Alloy During Hot Deformation

2018 9th International Conference on Mechanical and Aerospace Engineering (ICMAE) Pub Date : 2018-07-01 DOI:10.1109/ICMAE.2018.8467703

Jia-bin Zhang, Shihong Lu

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Abstract

In order to improve the formability of 5083 aluminum alloy in hot forming process. The effects of strain rate, temperature and elongation on microstructure evolution of 5083 aluminum alloy were analyzed by single tensile test at high temperature on RG2000-20 universal thermal tensile tester and numerical analysis. The results show that the smaller the strain rate, the larger the grain size and volume fraction of dynamic recrystallization, the lower the deformation temperature, the smaller the dynamic recrystallization degree and the larger the cavity size. Dynamic recrystallization occurs only when the deformation degree exceeds the corresponding boundary value. When deformation reaches a certain degree, the completely dynamic recrystallization can be obtained, and the volume fraction and void radius will increase rapidly. Furthermore, a dynamic recrystallization mathematical model of 5083 aluminum alloy for high temperature plastic deformation was established by linear regression method and proved to be reliable in numerical analysis.

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5083铝合金热变形组织演变及动态再结晶模型

为了提高5083铝合金热成形的成形性能。通过RG2000-20型万能热拉伸试验机的高温单次拉伸试验和数值分析，分析了应变速率、温度和伸长率对5083铝合金组织演变的影响。结果表明:应变速率越小，动态再结晶晶粒尺寸和体积分数越大;变形温度越低，动态再结晶程度越小，空洞尺寸越大;只有当变形程度超过相应的边界值时才会发生动态再结晶。当变形达到一定程度时，可获得完全动态再结晶，体积分数和空洞半径迅速增大。采用线性回归方法建立了5083铝合金高温塑性变形动态再结晶数学模型，并通过数值分析验证了模型的可靠性。

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2018 9th International Conference on Mechanical and Aerospace Engineering (ICMAE)

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