A systematic investigation on quaternary NbTiZr-based refractory high entropy alloys using empirical parameters and first principles calculations

Quaternary NbTiZr-based refractory high entropy alloys (RHEAs) have been studied in present work systematically based on empirical parameters and first principles calculations. Firstly, some simple rules based on the elemental properties are applied to screen out all possible elements in the quaternary NbTiZr-based RHEAs. Then, several commonly used empirical parameters, such as atomic size mismatch, average mixing enthalpy, the parameter Ω, are...