Evolutionary design of strong and stable high entropy alloys using multi-objective optimisation based on physical models, statistics and thermodynamics

A new integrated computational HEA design strategy is proposed. It combines a multi-objective genetic algorithm with (i) statistical criteria to guide the formation of a single phase, supplemented by computational thermodynamics (Thermo-Calc) and (ii) models for the estimation of alloy yield stress via solid solution hardening, to be maximised, and alloy density, to be minimised. This strategy is applied to the design of face-centered-cubic (FCC) HEAs and yields several thousands of new alloys. An alloy featuring an interesting combination of predicted stability, strength and density, AlCoFeMoNi (at%), is chosen among them, fabricated by vacuum arc melting and experimentally tested. The microstructure of this new HEA consists in a single FCC solid solution, as evidenced by X-ray diffraction (XRD), scanning electron microscopy (SEM) and X-ray energy dispersive spectroscopy (EDS) mapping. With a density of 7.95 g⋅cm, a Vickers hardness of 1.78 GPa, a yield stress of 215 MPa and an ultimate tensile strength of 665 MPa in the annealed state, its properties surpass those of existing FCC HEAs of comparable density.The work of Franck Tancret at the University of Cambridge was funded by the European Union's Horizon 2020 research and innovation programme under the Marie Sklodowska-Curie Actions grant agreement No 656 249: “Computer-Aided Design Of Revolutionary Superalloys” (CADORS). I. Toda-Caraballo wishes to acknowledge Professor Mark Blamire for provision of facilities at the University of Cambridge and the financial support of the fellowship 2016-T2/IND-1693, from the programme Atracción de talento investigador, (Consejeria de Educación, Juventud y Deporte, Comunidad de Madrid) at CENIM-CSIC.Peer Reviewe