Effect of Aluminium Content on Microstrure and Mechanical Properties of Al_xCoFe_1.9Ni_2.1 High Entropy Alloys

In this paper, AlxCoFe1.9Ni2.1 (x = 0.5, 0.8, 1.0, 1.5) high entropy alloys are prepared by vacuum arc melting furnace. The effect of aluminum content on the microstructure and mechanical properties was studied. alloy characterized SEM, X-ray diffraction EDS. results show that with increase content, varies from FCC to FCC+BCC structure finally single BCC structures. And when is exhibits slender dendritic structure, then turns mixture eutectic phase at x 0.8 1.0. reaches 1.5, changes into structure. With yield strength increased 172.3 MPa 949.6 MPa, hardness 127 HV 479 HV, which significantly improved alloy.