About this Abstract |
Meeting |
MS&T21: Materials Science & Technology
|
Symposium
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Integration between Modeling and Experiments for Crystalline Metals: From Atomistic to Macroscopic Scales III
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Presentation Title |
Effect of Twin-twin Junctions on Slip-twin Interactions and Twin-twin Intersections |
Author(s) |
Jiaxiang Wang, M.Arul Kumar, Krishna Yaddanapudi, Subhash Mahajan, Irene Beyerlein |
On-Site Speaker (Planned) |
Jiaxiang Wang |
Abstract Scope |
Twin-twin junctions (TTJs) can form in hexagonal close packed metals when multiple twin variants are activated in a grain. A TTJ can have distinctive effects on microscopic slip behavior and macroscopic deformation response compared to those by isolated or closely parallel twins. Here, a full-field crystal plasticity elasto-viscoplastic fast-Fourier transform model incorporating a dislocation density-based hardening law is employed to investigate the twin-twin interactions involved in TTJ formation and the effect of TTJs on slip-twin interactions. We focus our studies on the most commonly observed co-zone twin junction of {10-12} tensile twins in an Mg-Y alloy. For this case, we compute the evolution in the local micromechanical fields and underlying accumulation of dislocation densities for different slip modes during the formation of TTJs. These local fields, particularly dislocation densities, are compared with TEM analyses of TTJs in Mg-Y alloys to help gain insight into how twin-twin junctions develop under stress. |