The Effect of Solution Treatment on the Microstructure and Properties of AlCuCrFe2NiTi0.25 High-Entropy Hardfacing Alloy

Abstract

With the advancement of modern social science and technology, alloys composed solely of a single principal component are gradually unable to meet people’s needs. The concept of a new type of high-entropy alloy has been proposed. At present, high-entropy alloys are mostly prepared by vacuum arc furnace melting and casting methods. To improve this situation, this article uses plasma welding technology to prepare an AlCuCrFe2NiTi0.25 high-entropy alloy on a Q235 steel plate through multi-layer and multi-pass welding using plasma surfacing technology and adopts an appropriate solution treatment on this basis to obtain a higher-performance alloy. The conclusion drawn from different heat treatment processes is as follows: solution treatment was performed on an AlCuCrFe2Ni0.25 high-entropy alloy at a temperature of 1200 °C for 2 h, 3 h, and 4 h, respectively. After XRD phase analysis, it was found that the phase types of high-entropy alloys did not change after solution treatment. As the solution time increased, the diffraction peak intensity of the Laves phase gradually decreased. After 3 h of solid solution treatment, room temperature tensile tests were conducted to obtain the tensile strength and elongation of the AlCuCrFe2Ni0.25 high-entropy alloy at room temperature, which were 509 MPa and 23.8%, respectively, exhibiting the optimal comprehensive mechanical properties.