Multi-Scale Simulation of Dynamic Strain Aging in Al-Mg Alloy

[00:84987]本研究的目的是建立一个基于潜在变形机制的模型来预测导致A1-Mg合金成形性差的现象。在铝中添加镁可以提高强度，但也会对成形性产生不利影响。导致成形性差的微观组织机制是一种称为“动态应变时效”的过程。动态应变老化是由快速扩散的溶质原子（如镁）与位错相互作用引起的。这些相互作用导致位错在晶内和跨晶界的非定常集体运动，从而导致不稳定的流动，从而导致成形性差。在宏观层面上，一个关键的定义流动的表现，因此成形性差。在宏观层面上，动态应变老化的一个关键表征是负应变率敏感性。根据微观结构事件预测这种现象和由此产生的不良成形性是本工作的主要目标

0084987The objective of the research is to develop a model to predict phenomena leading to poor formability in A1-Mg alloys based on the underlying deformation mechanisms. Magnesium is added to aluminum to improve strength properties but is found to also have a detrimental effect on formability. The microstructural mechanism responsible for the poor formability is a process called "dynamic strain aging." Dynamic strain aging results from fast diffusing solute atoms, such as magnesium, interacting with dislocations. These interactions lead to unsteady, collective motion of dislocations, within grains and across grain boundaries, resulting in unstable flow and hence poor formability. At the macroscopic level, a key defining manifestation of flow and hence poor formability. At the macroscopic level, a key defining manifestation of dynamic strain aging, is a negative strain rate sensitivity. Predicting this phenomenon and the resulting poor formability, based on microstructure events, is the primary objective of this work.***