Effect of solid solution time on microstructure and properties of High-Entropy Alloy Particle Reinforced Aluminum Matrix Composites.

The rapid advancement of new energy vehicles has led to a significant increase in the demand for lightweight materials. Further research is required on the 7075 aluminum alloy utilized in wheel hub products. In this study, AlFeNiCoCr high-entropy alloy particles reinforced 7075Al matrix composites were prepared through isometric angular extrusion. The influence of solid solution time at a temperature of 490°C on the microstructure and mechanical properties of the composites was investigated.It was observed that at solid solution times ranging from 1h to 3.5h, the composite subjected to a solid solution time of 1.5h exhibited superior mechanical properties, including a tensile strength of 507.14 MPa, elongation of 11.43%, and hardness of 158.27 HV. However, after undergoing solid solution for an extended period (3 hours), defects such as pores appeared in the composites, leading to coarsening grains within the 7075Al matrix and deterioration in interfacial bonding between reinforcement and matrix material. Consequently, there was a significant decrease in performance for these composites.