|About this Abstract
||2022 TMS Annual Meeting & Exhibition
||Advances in Multi-Principal Elements Alloys X
||Interplay between dislocations and correlated stress environment in random alloys
||Pierre-Antoine Geslin, Ali Rida, Enrique Martinez Saez, David Rodney
|On-Site Speaker (Planned)
Solid solution strengthening is particularly important for the study and development of high entropy alloys.
To investigate the influence of this solid solution on dislocation behavior, we first propose an elastic model of random alloys where atoms of different sizes are modeled as Eshelby inclusions. This allows to derive analytical expressions for the variance and the spatial correlations of the stress field that impedes dislocation motion. Surprisingly, we show that stress correlations are highly anisotropic despite the use of isotropic elasticity and the randomness of the alloy.
Next, we use this correlated stress environment in a dislocation dynamics framework to derive the critical stress for dislocation depinning. We show that the stress correlations are crucial ingredients to predict accurately the magnitude of solid solution strengthening operating on screw and edge characters in these concentrated random alloys.
||High-Entropy Alloys, Computational Materials Science & Engineering, Other