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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.
Proceedings Inclusion? Undecided


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Characterisation of static recrystallisation and grain growth in designed gradient microstructures: a pathway to high-throughput microstructural testing?
Continuum Dislocation Dynamics-based Modeling of the Strain Hardening Behavior of ECAPed Aluminum Alloy
Microstructure and Mechanical Properties of Diffusion Bonded IN740H
Probing Differences in Processing and Texture in FCC/BCC Nanolaminates Fabricated via Accumulative Roll Bonding

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