Tribological behavior of high-entropy alloy particle reinforced aluminum matrix composites and their key impacting factors

Al0.5CoCrFeNi high-entropy alloy particles reinforced aluminum matrix composites (HEAps/AMCs) with various reinforcement additions (0.5, 1.5, 3.0, and 5.0 wt%) were fabricated. The coefficient of friction (COF, about 0.45-0.47) and wear rate (0.32-0.40 10-3 mm3/Nm under 30 N) of HEAps/AMCs tribosystems with a moderate range of reinforcement (0.5-3.0 wt%) were lower than the matrix alloy. HEAps hindered plastic deformation of the contact surface, increasing the wear resistance of the AMCs. Due to the tight interface and the interaction between the HEA particles and dislocations, the AMC was stabilized during the wear tests and showed a dramatically improved capacity to resist crack initiation, propagation, and fracture around the interface.

Automated summary

Al0.5CoCrFeNi high-entropy alloy particles reinforced aluminum matrix composites (HEAps/AMCs) with various reinforcement additions were fabricated and their wear properties were investigated. It was found that a moderate range of reinforcement exhibited lower coefficient of friction and wear rate compared to the matrix alloy. The HEA particles hindered plastic deformation and improved the crack resistance of the composites through tight interface and interaction with dislocations.