|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||High Entropy Alloys VI
||First-principles Prediction of High-entropy-alloy Stability
||Michael Widom, Rui Feng, Peter Liaw, Michael Gao
|On-Site Speaker (Planned)
We demonstrate phase stability in the multicomponent alloy system of Cr-Mo-Nb-V, for which some of its binary subsystems are subject to phase separation and others are subject to complex intermetallic phase formation (Laves phases). Our first-principles calculation of free energy predicts that the configurational entropy stabilizes a single body-centered cubic (BCC) phase from T = 1,700K up to melting, while precipitation of a complex intermetallic is favored at lower temperatures. We form the compound experimentally and confirm that it forms as a single BCC phase from the melt, but that it transforms reversibly at lower temperatures, thus illustrating the entropic stabilization principle of HEAs. An additional impurity phase containing carbon and silicon is also identified.
||Planned: Supplemental Proceedings volume