|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Deformation and Transitions at Interfaces
||Influence of Twin-grain Boundary Interactions on Further Twin Growth and Twin Transmission in HCP Metals
||Carlos Tome, M. Arul Kumar, Irene J Beyerlein
|On-Site Speaker (Planned)
Deformation twins in HCP polycrystals nucleate from grain boundaries (GBs) and propagate to span the entire grain. The shear transformations associated with twins are constrained by the grain boundaries and most twins are terminating at GBs. This constraint creates a stress reversal in the twin region that can be quantified as a backstress, and which tends to suppress the twin growth. At the same time, the local reaction at the GBs creates stress concentrations in the neighboring grain in the vicinity of twin tip. This will lead to twin transmission across GBs. In this work we employ a full-field Fast-Fourier-Transform modeling tool to characterize the role of twin-grain boundary interactions on twin growth and twin transmission. In this process we have developed a correlation between twin growth, grain size and neighboring grain crystal orientation effect. We also make a connection between twin transmission, neighboring grain orientation and material anisotropy.