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A Physically Based Constitutive Model and Continuous Dynamic Recrystallization Behavior Analysis of 2219 Aluminum Alloy during Hot Deformation Process

机译：热变形过程中2219铝合金的物理型模型及连续动态再结晶行为分析

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The isothermal compression tests of the 2219 Al alloy were conducted at the temperature and the strain rate ranges of 623–773 K and 0.01–10 s−1, respectively, and the deformed microstructures were observed. The flow curves of the 2219 Al alloy obtained show that flow stress decreases with the increase in temperature and/or the decrease in strain rate. The physically based constitutive model is applied to describe the flow behavior during hot deformation. In this model, Young’s modulus and lattice diffusion coefficient are temperature-dependent, and the creep exponent is regarded as a variable. The predicted values calculated by the constitutive model are in good agreement with the experimental results. In addition, it is confirmed that the main softening mechanism of the 2219 Al alloy during hot deformation is dynamic recovery and incomplete continuous dynamic recrystallization (CDRX) by the analysis of electron backscattered diffraction (EBSD) micrographs. Moreover, CDRX can readily occur under the condition of high temperatures, low strain rates, and large strains. Meanwhile, the recrystallization grain size will also be larger.
机译：在温度下进行2219Al合金的等温压缩试验，分别在623-773k和0.01-10S-1的应变率范围内进行，并且观察到变形的微观结构。所获得的2219 Al合金的流动曲线表明，流量应力随温度和/或应变速率降低而降低。基于物理上的本构体模型用于描述热变形期间的流动性能。在该模型中，杨氏模量和格子扩散系数是温度依赖性的，并且蠕变指数被认为是可变的。由本文模型计算的预测值与实验结果吻合良好。此外，证实，通过分析电子反向散射衍射（EBSD）显微照片，确认在热变形期间的2219 Al合金的主要软化机制是动态回收和不完全的连续动态再结晶（CDRX）。此外，CDRX可以在高温，低应变率和大菌株的情况下容易地发生。同时，重结晶晶粒尺寸也会更大。

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