| Abstract Scope |
We present a framework for joint optimization of the mechanical and physical properties of refractory high-entropy alloys (RHEAs), one accounting for material strength, temperature, creep, fatigue, fracture toughness, ductility, conductivity, and environmental (oxidation) resistance. The joint optimization scheme captures design objectives and requirements, as presented to alloy designers. The joint optimization involves extension to RHEAs of techniques originally developed by Rettig et al. and by Conduit et al., both for Ni-based superalloys. Whereas these techniques may work well for the Ni-based superalloys, for which plenty of data is available (after decades of study), and has already been collected, they may not be directly applicable to the much more recent HEAs, due to data limitations. We present hybrid approaches, where synthetic data points are computed using CALculations of PHAse Diagrams (CALPHAD) and density functional theory (DFT), to supplement those from CALPHAD only, and to make the most of the data available. |