|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Advanced Characterization Techniques for Quantifying and Modeling Deformation Mechanisms
||Explicit Modeling of Twin Lamellae in AZ31 Using a Crystal Plasticity Finite Element Approach
||Milan Ardeljan, Irene J. Beyerlein, Marko Knezevic
|On-Site Speaker (Planned)
Deformation twinning is known to be an influential deformation mechanism governing the mechanical response and microstructure evolution in low symmetry metals. In this work we present a detailed analysis of twin nucleation and propagation in magnesium alloy-AZ31 using an explicit method for representing the twin morphology and crystallographic twin-matrix orientation relationship within a microstructural full-field crystal plasticity framework. Using this model, we study the stress-strain fields and relative activities of the active deformation slip modes before and after the formation of a twin, within the twin and in the parent grain both close to the twin and away from the twin boundaries. We determine the fields driving expansion in the case of extension twins, which are experimentally reported to have large thicknesses, which oftentimes can span across the entire parent grain. We also predict the fields around contraction twins that would hinder their growth, hence tend to make them thin.
||Planned: Supplemental Proceedings volume