|About this Abstract
||3rd World Congress on High Entropy Alloys (HEA 2023)
||Strength Reductions of Metal Alloys with Short-range Order as Revealed by Atomistic Simulations
||Xin Liu, William Curtin
|On-Site Speaker (Planned)
A theory for strengthening for multicomponent non-dilute alloys possessing short-range order (SRO) has recently been developed. The theory predicts that, in addition to athermal strengthening, there is a notable effect of SRO on the solute-dislocation interactions that can change the strength relative to a random alloy. Atomistic simulations in a model binary NbW alloy are used to demonstrate that alloy strength due to solute-dislocation interactions can be increased or decreased depending on the SRO. Specifically, SRO is introduced using fictitious solute-solute interactions and the Nudged Elastic Band method is used to compute the energy barriers for edge dislocation motion. Energy barriers can be decreased when the SRO parameters are negative. The theoretical predictions for the same system are in reasonable quantitative agreement with the simulation results. These findings demonstrate the unexpected possibility of reduced strength due to SRO and validate the analytical theory as a tool to guide alloy design.
||Planned: Metallurgical and Materials Transactions