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In this study, effects of morphology and chemical distribution of powder on mechanical properties was investigated in Al_0.5CoCrCuFeNi high-entropy alloys produced via powder metallurgy. At the early stages of ball-milling, Cr-deficient large powder is flattened, while Cr-rich powder is fractured to small particles because of the flattening of ductile particles and fragmentation of hard particles at initial milling stage. However, with an increase in the milling duration, the Cr atoms were more uniformly distributed throughout the powders and the powders exhibited spherical shape with smooth surface. Moreover, as the ball-milling duration increased from 36 to 96 h, the Vickers hardness and compressive yield strength also increased from 433 Hv_0.5 and 1166 MPa to 525 Hv_0.5 and 1739 MPa, respectively. This was attributed to the spherical powders reducing as well as forming fine and uniform microstructures in …