|About this Abstract
||2022 TMS Annual Meeting & Exhibition
||Advanced Characterization Techniques for Quantifying and Modeling Deformation
||NOW ON-DEMAND ONLY – The Effects of Precipitates on Twinning in Mg Alloys
||Brandon Leu, M Arul Kumar, Kelvin Y Xie, Irene J Beyerlein
|On-Site Speaker (Planned)
Precipitates have shown to strengthen Mg-alloys by blocking dislocation glide. However, the interactions between these precipitates and commonly occurring deformation twins is much less understood. Here, an elasto-viscoplastic fast-Fourier-transform (EVP-FFT) model is used to study the interactions between plate-shaped basal precipitates and twins in Mg-Al alloys. Our results suggest that while precipitates may impede the propagation and growth of twin, they can also cause stress localizations that promote the nucleation of multiple new twins. The location of the twin-precipitate interaction site and the size of the precipitate are shown to influence the propensity for new twins to develop. Depending on the twin-precipitate impingement site, we propose various twinning pathways that may help explain how twins can proliferate the matrix in the presence of precipitates.