|About this Abstract
||2021 TMS Annual Meeting & Exhibition
||Continuous Phase Transformations
||Effect of Bulk and Local Phase Transformation on Deformation Mechanisms
||Maryam Ghazisaeidi, Mulaine Shih, Edwin Antillon
|On-Site Speaker (Planned)
Motivated by high entropy alloys (HEAs), we first study the dislocation behavior in the composition-dependent metastable fcc alloys. Transitioning from fcc to hcp stable phases in fcc alloys corresponds to a change from positive to negative average stacking fault energy (SFE). Using Molecular Dynamics simulations, we study the effect of average versus “local” SFE on the dislocation stability and its connection to the decorrelation force to break the partial dislocations from equilibrium in these alloys. Next, using our newly developed Multicell Monte Carlo method for phase prediction, we study the formation of local phases at dislocations and boundaries and their subsequent effect on deformation in model alloys. Our results provide a framework for a broader consideration of the effect of bulk and local phase transformations on deformation mechanisms in metallic alloys.
||Computational Materials Science & Engineering, Phase Transformations, High-Entropy Alloys