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

铝镁合金动态应变时效的多尺度模拟

• 批准号: 0084987
• 负责人: Catalin Picu
• 金额: $ 25万
• 依托单位: Rensselaer Polytechnic Institute
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2000
• 资助国家: 美国
• 起止时间: 2000-09-01 至 2004-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0084987&HistoricalAwards=false
• 关键词: Multi; Scale; Simulation; Dynamic; Strain

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.***

0084987研究的目的是开发一种模型，以预测基于潜在变形机制导致Al-Mg合金可成形性差的现象。镁被添加到铝中以提高强度性能，但发现对可成形性也有不利影响。造成成形性差的微观组织机制是一个称为“动态应变时效”的过程。“动态应变时效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粒内和穿过晶界的不稳定的集体运动，导致不稳定的流动，从而导致差的可成形性。在宏观层面上，流动的关键定义表现，因此可成形性差。在宏观层面上，动态应变时效的一个关键定义表现是负应变率敏感性。基于微观结构事件预测这种现象以及由此产生的较差的成形性是这项工作的主要目标。*