|About this Abstract
||2022 TMS Annual Meeting & Exhibition
||Advances in Multi-Principal Elements Alloys X
||Modeling the Effect of Stress and Composition on the Stability of Lomer/Lomer-Cottrell Dislocations
||Anas Abu-Odeh, Tarun Allaparti, Mark Asta
|On-Site Speaker (Planned)
Lomer (L) and Lomer-Cottrell (LC) dislocations are present in many aspects of deformation in FCC metals and alloys. In particular, LC dislocations can act as effective barriers for dislocation motion, and they can act as stress concentrators for potential twin nucleation sites. Recent focus on concentrated FCC solid solution alloys has resulted in many reported observations of this dislocation and its potential role in the mechanical behavior of these alloys. However, little is understood about L and LC dislocations in concentrated alloys and how the effect of solutes changes the response of these dislocations to stress. We present atomistic simulations of L and LC dislocation cores in a model Cu-Ni system and find that the effect of chemical composition and of the orientation of the applied stress result in significantly different behaviors. These results provide new insights into mechanisms contributing to work hardening in concentrated FCC solid solution alloys.
||Modeling and Simulation, Mechanical Properties, Computational Materials Science & Engineering