Effect of Different Aging Times on the Microstructure and Properties of Fe24Co29Ni38Al3Ti6 High-Entropy Alloy

Fe24Co29Ni38Al3Ti6 high-entropy alloy was prepared by vacuum arc melting. Its organization and properties after different aging treatments were investigated. Results show that the high-entropy alloys subjected to different aging treatments are all composed of the FCC matrix phase and the gamma ' precipitation phase of the L12 structure with good phase stability. With prolonged aging, the size of the precipitated phase gradually increases, but its volume fraction first increases and then decreases. The wear mechanisms of the high-entropy alloys are abrasive wear and oxidative wear. When the aging time is more than 16 h, the high-entropy alloys show exfoliation wear. When the aging time is 16 h, the precipitation phase of the alloy is uniformly distributed and the volume fraction is the highest. At this time, the alloy has the most excellent wear resistance and tensile properties. The tensile strength, yield strength, and elongation are similar to 1275, similar to 1117 MPa, and similar to 25.2%, respectively. The fracture mechanism is ductile fracture. Aging treatment for different times has a certain effect on the mechanical properties of the alloy and allows the alloy to precipitate precipitated phases with different volume fractions.