Abstract
AlxFeMnNiCrCu0.5 (x = 0.0, 0.25, 0.5, 1.0) high-entropy alloys have been successfully fabricated by vacuum arc melting. The effect of the aluminum content (x) on the constituent phases, microstructural characteristics, and mechanical properties of the alloy was investigated in the as-cast state. The results indicated that with an increase in the aluminum content, the phases of alloys varied from duplex FCC phases (x = 0.0) to duplex FCC phases plus BCC phase (x = 0.25), FCC phase plus duplex BCC phases (x = 0.5), and eventually to duplex BCC phases (x = 1.0). The hardness of alloys gradually increases from 216 HV to 518 HV when Al content increases from 0.0 to 1.0. However, more Al content cannot result in increasing tensile properties. Al0.25FeMnNiCrCu0.5 HEA shows remarkable comprehensive mechanical properties, which its hardness, yield strength, ultimate tensile strength, and elongation are 305 HV, 552 MPa, 924 MPa, and 16.8%, respectively.
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