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Damage and strengthening mechanisms in severely deformed commercially pure aluminum: Experiments and modeling

机译：严重变形商业纯铝中损伤和加强机制：实验和建模

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摘要

The current investigation presents a breakdown analysis of the elastoplastic behavior of commercially pure aluminum pre-strained via severe plastic deformation (SPD) and tested in tension. The tensile samples selected, owing to their prior SPD, had the gradient microstructure from the fragmentation stage as well as a homogeneous equiaxed structure from the steady-state regime. Except for the regions of low deformation and steady-state of SPD, the microstructures of pre-strained material were largely dominated by the presence of geometrically necessary boundaries. During tensile straining, dislocation strengthening contributed more to the overall material strength in fragmentation stage samples, while grain boundary strengthening played a major roie in the steady-state stage samples. The dislocation density evolution rate-based approach predicted a more active role for the dynamic annihilation/recovery events in the SPD material when compared to the fully recrystallized condition. This could explain the drastic drop in tensile elongation of the pre-strained material as well as the enhancement in uniform and post-necking elongation with the gradual increase in the amount of pre-strain. A plastic instability condition based on the dislocation density evolution approach successfully accounted for the observed stable deformation limits in the coarse- and fine-grained material.
机译：目前的研究介绍了通过严重塑性变形（SPD）预应紧张的商业纯铝的弹性塑性行为的击穿分析，并在张紧中测试。由于其先前的SPD选择的拉伸样品具有来自碎片阶段的梯度微结构以及来自稳态状态的均匀等轴结构。除了低变形和SPD稳定状态的区域外，预束材料的微观结构主要是通过几何必要边界的存在。在拉伸紧张期间，位错强化促进了碎片阶段样品中的整体材料强度，而晶界强化在稳态阶段样本中发挥着主要的牛。基于位错的密度演化率的方法预测了与完全再结晶的条件相比，在SPD材料中的动态湮灭/恢复事件发生更积极的作用。这可以解释预先应变材料的拉伸伸长率的急剧下降以及均匀和后颈伸长率的增强，随着预留量的逐渐增加。基于位错密度进化方法的塑料不稳定条件成功地占粗粒和细粒材料中观察到的稳定变形限制。

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