High entropy alloy particle reinforced 6061 aluminum matrix composites: An investigation of mechanical strength and thermoelectric properties

The relentless pursuit of advanced materials characterized by superior mechanical and thermoelectric properties has spurred significant research into metal matrix composites (MMCs), particularly aluminum matrix composites (AMCs). This study investigates the development of 6061 aluminum alloy composites reinforced with varying concentrations (4–10 wt%) of AlCoCrFeNi high-entropy alloy (HEA) particles via Spark Plasma Sintering (SPS). Key findings underscore the positive impact of HEA reinforcement on the density and hardness of AMCs, while revealing a complex relationship between HEA content and strength. The composite incorporating 6 wt% HEA exhibited optimal properties, characterized by a density of 2.85 g/cm³, Vickers hardness of 85 HV, ultimate tensile strength of 174 MPa, and elongation of 13.7 %. A corresponding peak in thermal conductivity was observed at this composition, while electrical conductivity diminished due to increased phonon scattering.