Strengthening of Al Matrix Composites by High Entropy Phases

Aluminum matrix composites (AMCs) have been extensively studied in future mobility industries because of their excellent mechanical properties and elastic modulus. Although carbon-based or ceramic materials have been used as reinforcement for AMCs, their poor wettability with aluminum should be overcome to develop high-strength lightweight composites.<br/>This study employs high entropy alloys (HEAs) as reinforcement AMCs. HEAs have superior stiffness and strength as well as good wetting ability with aluminum. Two different types of composites are suggested in this study. First, sub-micron sized HEA particles, produced by thermal plasma treatment, were dispersed in aluminum powder. The composite powder was consolidated using hot rolling. Second, gas-atomized HEA powder and Al powder were simultaneously additive manufacturing using a multi-nozzle direct energy deposition (DED) printer. The effect of HEA phases on the strengthening of the Al matrix will be discussed.