| About this Abstract |
| Meeting |
Materials Science & Technology 2020
|
| Symposium
|
Bulk and Sheet Thermal-Deformation Processing and Microstructure Development in Metals – Characterization, Experiments and Modeling
|
| Presentation Title |
Continuum Dislocation Dynamics-based Modeling of the Strain Hardening Behavior of ECAPed Aluminum Alloy |
| Author(s) |
Ali Kobaissy, Georges Y. Ayoub, Mu'Tasem Shehadeh |
| On-Site Speaker (Planned) |
Georges Y. Ayoub |
| Abstract Scope |
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. The ECAP-processed aluminum microstructure, texture and dislocation densities and then the mechanical properties are predicted. |