High Pressure High Temperature Measurements of Eutectic High Entropy Alloy AlCoCrFeNi_2.1

Additively manufactured eutectic high entropy alloys (EHEAs) have recently emerged as potential materials for use in extreme conditions due to their simultaneous high strength and ductility. Of these materials, AlCoCrFeNi_2.1 has shown high strength and ductility in simulations and static experiments. However, much about this alloy’s structural response to pressure is still unknown. We present the first combined static and dynamic compression experiments to study the structural evolution of additively manufactured EHEA AlCoCrFeNi_2.1 up to 400 GPa in pressure. Our in-situ X-ray diffraction measurements taken at using the SACLA X-ray Free Electron Laser (XFEL) of compressed EHEA captured appearance distinct phases at different pressure and temperature conditions. We present the comparison between these experiments, static phase measurements, and molecular dynamic simulations. By mapping the phase stability of AlCoCrFeNi_2.1and determining how it compares to simulations, we can improve simulations and better predict the applicability of this alloy to extreme environments.