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首页> 外文期刊>International Journal of Plasticity >Modeling of continuous dynamic recrystallization of Al-Zn-Cu-Mg alloy during hot deformation based on the internal-state-variable (ISV) method
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Modeling of continuous dynamic recrystallization of Al-Zn-Cu-Mg alloy during hot deformation based on the internal-state-variable (ISV) method

机译：基于内部状态变量（ISV）法的热变形期间Al-Zn-Cu-Mg合金连续动态再结晶的建模

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摘要

Al-Zn-Cu-Mg alloys (e.g., AA7075) have been widely used to form structural components in aerospace and other industries. For Al-Zn-Cu-Mg alloys, although dynamic recovery was dominant in hot deformation, dynamic recrystallization also occurred frequently, such as continuous dynamic recrystallization (CDRX), for which various mechanisms were found, e.g. subgrain boundary migration, subgrain coalescence, and subgrain rotation. However for the as-extruded AA7075 alloy subjected to hot compression, the mechanisms of CDRX process and model for it are lacking. In this paper by conducting thermal simulation compression tests combined with electron back scattered diffraction (EBSD) experiments, a continuous dynamic recrystallization (CDRX) process during the hot deformation of the as-extruded Al-Zn-Cu-Mg alloy (AA7075) is revealed based on the analysis on deformation behavior and characteristics of the recrystallized microstructures. It was found that subgrains, which were formed through dynamic recovery (DRV), rotated by absorbing dislocations into its boundaries, and resulted in the formation of the recrystallized grains. Then based on the explored CDRX mechanism, the dislocation density, subgrain boundary area, recrystallized grain boundary area, high angle grain boundary area and subgrain boundary misorientation were determined as internal-state-variables, and a continuous dynamic recrystallization model for AA7075 alloy was developed. In the established model, the process of subgrain rotation was described by introducing subgrain boundary stored energy, which related to dislocation density, subgrain size and misorientation. Finally, the continuous dynamic recrystallization model was combined with a constitutive model for the unified prediction of the flow stress and the microstructure evolution during the hot deformation of AA7075. Predictions of the model are in good agreement with the experimental ones.
机译：Al-Zn-Cu-Mg合金（例如，AA7075）已被广泛用于在航空航天和其他行业中形成结构部件。对于Al-Zn-Cu-Mg合金，尽管在热变形中占主导地位的动态回收，但是经常发生的动态重结晶，例如连续的动态再结晶（CDRX），其发现各种机制，例如各种机制。粒边界迁移，粒子聚结和粒子旋转。然而，对于挤出的AA7075合金进行热压缩，CDRX过程和模型的机制缺乏。在本文通过进行热模拟压缩试验，与电子背散射衍射（EBSD）实验结合，揭示了用挤出的Al-Zn-Cu-Mg合金（AA7075）的热变形期间的连续动态再结晶（CDRX）过程基于分析重结晶微观结构的变形行为及特性。发现通过动态恢复（DRV）形成的亚甲基通过将脱位吸收到其边界中而旋转，并导致形成再结晶颗粒。然后基于探索的CDRX机构，确定了脱位密度，粒边界区域，重结晶晶界面积，高角度晶界面积和粒度边界界定作为内部变量，开发了AA7075合金的连续动态再结晶模型。在已建立的模型中，通过引入粒子边界存储的能量来描述粒旋转的过程，该储存能量与位错密度，子粒大小和杂乱化有关。最后，连续动态再结晶模型与AA7075的热变形期间的流量应力的统一预测和微观结构演变的组成模型组合。对模型的预测与实验性吻合良好。

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