Microstructure and properties of FeCoCrNiMo high-entropy alloy particles reinforced 5083 Al composite fabricated by multi-channel equal-diameter angular hot extrusion

The preparation of FeCoCrNiMo high-entropy alloy (HEA) particle-reinforced aluminum matrix composites using multi-pass equal-diameter angular extrusion is an effective approach to address the application limitations related to strength and toughness. In this study, the composite materials were prepared by multi-pass equal-diameter angular extrusion. The results indicate that the composite with 15 vol% HEA exhibits optimal comprehensive performance after three passes of extrusion, with hardness, strength, and elongation at fracture measuring of 174.50 HV, 355 MPa, and 12.37 %, respectively. Compared with the material extruded in a single pass, the hardness increased by 10.3 %, while the strength improved by 18.3 %, over the 5083 Al matrix, although the elongation slightly decreased. Present research discussed the influence of different extrusion passes on the mechanical properties of final composites, and utilized numerical simulations to calibrate the experimental research, with theoretical calculations serving as benchmark for experimental validation. Additionally, quantitative analysis of different strengthening mechanisms is conducted, and the formation mechanism of diffusion layer is revealed. This research provides a strategy for the fabrication of 15vol%FeCoCrNiMo_p/5083 Al composites.