Microstructure Evolution, Phase Composition, Tensile and Hardness Properties Investigation of CrCuFeNi2Tix-Based High-Entropy Alloys

Microstructure evolution, Phase coMPosition, tensile and hardness ProPerties investigation of crcufeni 2 ti x -Based high-entroPy alloys CrCuFeni 2 Ti x high-entropy alloys (heAs) (x = 0.1 ~ 0.7) are prepared and studied in this paper to investigate the effect of titanium on the microstructure, phase composition, and mechanical properties of the CrCuFeni 2 Ti x -based system.Microstructural studies using scanning electron microscopy (SeM) and X-ray diffraction (XRD) showed that the addition of titanium could induce the formation of a body-centered cubic lattice (BCC) and intermetallic compounds (ni 3 Ti) of the CrCuFeni 2 Ti x -based system.The practical formation of the phases meet the theory of the atomic size difference δ, mixing enthalpy ΔH mix , mixing entropy ΔS mix , valence electron concentration (VEC), and electronegativity difference Δχ.Additionally, the tensile and hardness properties of the CrCuFeni 2 Ti x -based system are investigated in this study.generally, CrCuFeni 2 Ti x heAs show low stiffness and good flexibility in mechanical properties.When the x value is relatively small, the heAs show good ductility in the tensile test, which is the result of a face-centered cubic lattice (FCC) in the phase composition at this stage; when the x value becomes larger, due to the formation of the intermetallic compounds ni 3 Ti, the heAs show high hardness.