Effect of Heat Treatment Temperature on the Microstructure and Mechanical Properties of FeCoNiCr0.6Al0.4 High-Entropy Alloy

Abstract

In this study, the FeCoNiCr0.6Al0.4 high-entropy alloy was prepared using the vacuum arc melting method, and various aging heat treatments were applied. The effects of different aging temperatures on the phase structure, microstructure, mechanical properties, and wear properties of high-entropy alloys were systematically investigated. The results show that the phase structure of the high-entropy alloy transforms from a simple FCC phase to an FCC + BCC phase with increasing aging temperature. The tensile properties of high-entropy alloys initially improve and then deteriorate as the aging temperature increases. At an aging temperature of 700 °C, the high-entropy alloy exhibits optimal mechanical properties, with a tensile strength of approximately 1157 MPa and an elongation at break of about 37%. The FeCoNiCr0.6Al0.4 high-entropy alloy exhibits high wear resistance, with a wear volume of 0.0112 mm³ under a 3N load. The wear mechanism is primarily abrasive wear, accompanied by oxidation and stratified wear.