FURI | Spring 2024

Simulation of MoNbTaW Refractory High Entropy Alloy (RHEA) Optimization for High Temperature and Strength Applications

Aircraft engine efficiency depends on the operating temperature, where current nickel-superalloys are limiting that temperature to 800°C to preserve mechanical strength. The refractory high entropy alloy (RHEA) MoNbTaW has the desired mechanical properties of the current conventional alloys but maintain those properties at much high temperatures, exceeding 1200°C. This project’s purpose is to find compositions of the RHEA that maintain the high temperature mechanical strength while minimizing the shortcomings of room temperature brittleness by optimizing short range order, diffusion anti-phase boundary energy, and lattice distortion.