Frontiers in Materials, Год журнала: 2022, Номер 8
Опубликована: Янв. 20, 2022
High-entropy alloys (HEAs) are nearly equimolar multi-principal element alloys, exhibiting exceptional thermal and mechanical properties at extreme conditions such as high-temperatures stresses. Since the first discovery early conceptualization of conventional HEAs two decades ago, with far-from-equimolar compositions have attracted substantial interest to provide a broader range material adjust price fluctuations availability commodities. Here, we present first-principles investigation non-equimolar chromium-manganese-iron-cobalt-nickel (CrMnFeCoNi) effects molybdenum (Mo) niobium (Nb) substitutions on cost, phase stability solubility, performance up 1000 K operational temperature. Virtual-crystal approximation is used expediently approximate random solid solutions disordered mean-field limit. Using multi-objective metaheuristics built database, golden predicted for thermally well-insulated components effective heat sinks. Replacing Co Fe lowers commodity costs without hindering solubility. Lower Ni concentration leads lower conductivity, indicating better insulation, while reducing Mn significantly increases performing Moving away from ratios commonly expansion coefficient, which could generate higher Nb Mo substitution always lead substantially cost density but an increment in due solid-solution hardening. However, alloying only compositional space that reduces conductivity coefficient.
Язык: Английский
