|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||High Entropy Alloys V
||Design of "High Entropy Alloys" (HEA) with Optimal Combinations of Stability, Density, Strength and Ductility
||Edern Menou, Isaac Toda-Caraballo, Emmanuel Bertrand, Gérard Ramstein, Pedro Rivera-Díaz-del-Castillo, Franck Tancret
|On-Site Speaker (Planned)
New “high entropy alloys” have been designed by genetic algorithm multi-objective optimisation relying on (i) both computational thermodynamics (Thermo-Calc CALPHAD software) and a Gaussian process model combining most of the physical criteria available in the literature to guide the formation of a single phase, (ii) the minimisation of density, (iii) the maximisation of yield stress using a solid solution hardening model, and/or (iv) the maximisation of ductility based on a CALPHAD estimate of the stacking fault energy. Some of the designed alloys have been cast, homogenised at high temperature and characterised by X-ray diffraction, scanning electron microscopy, energy dispersive X-ray spectroscopy and Vickers hardness testing. Among others, we have obtained a single phase alloy with a density of 5.25 g/cm3 with a hardness in excess of 6 GPa (indicating a yield stress around 2000 MPa), which could be even improved by applying additional thermo-mechanical treatments to refine grain size.
||Planned: Supplemental Proceedings volume