In this work, a multi-scale framework that couples a crystal plasticity (CP) scheme with a continuum dislocation dynamics (CDD) model is proposed to predict the material behavior, microstructure and texture during equal channel angular pressing (ECAP) processes. The strain hardening in the model is considered to result from both the increase in the dislocation density and the grain fragmentation. The grain fragmentation process is modeled by accounting for the grain-grain interaction and incorporating the concept of the geometrically necessary dislocations (GNDs) into the mean free path of the dislocations. GNDs result from grain boundaries restricting the free deformation of a grain, causing an internal plastic deformation gradient that subsequently leads to grain fragmentation. A commercial Al-1100 billet, with rolling texture, is ECAP processed under Route C for different numbers of passes. Mechanical, microstructure, and texture characterization is achieved for the received and ECAPed materials. The proposed model parameters are calibrated using the tensile true-stress true-strain curves of the unprocessed material at two strain rates. The ECAP-processed aluminum microstructure, texture, dislocation densities and the mechanical properties are predicted.

在这项工作中，提出了一种多尺度框架，该框架将晶体可塑性（CP）方案与连续性位错动力学（CDD）模型相结合，以预测等通道角挤压（ECAP）过程中的材料行为，微观结构和织构。该模型中的应变硬化被认为​​是由于位错密度的增加和晶粒破碎所致。晶粒破碎过程是通过考虑晶粒与晶粒之间的相互作用并将几何上必要的位错（GND）的概念纳入位错的平均自由程来建模的。GND是由于晶界限制了晶粒的自由变形而导致的，其内部塑性变形梯度随后导致晶粒破碎。具有滚动纹理的商业Al-1100钢坯，在路线C下针对不同数量的通行证进行了ECAP处理。对已接收和ECAPed的材料进行了机械，微观结构和纹理表征。所提出的模型参数是使用未加工材料在两个应变率下的拉伸真实应力真实应变曲线进行校准的。预测了ECAP处理的铝的微观结构，织构，位错密度和机械性能。