Effects of Y and Al additions on the microstructure and tensile properties of CoCr_3Fe_5Ni high entropy alloys

摘要

CoCr3Fe5Ni high entropy alloys are synthesized with additions of Y and Al by induction smelting. The effects of Y and Al elements on the microstructure development and tensile mechanical properties of the alloy samples were studied. The results showed that Al additions helped stabilize eutectic structure, while the additions of Y showed the opposite effect. By adjusting the amounts of Y and Al, the lamellar structure could be introduced in the BCC matrix in a controlled manner. In doing so, a good combination of tensile strength and plasticity was achieved in the alloys. For Y0.01Al0.4CoCr3Fe5Ni alloy, the ultimate tensile strength was found to be 1002.5 MPa while the percent elongation reached 25.9%. (C) 2021 Elsevier B.V. All rights reserved.