Novel Co-Cu-Based Immiscible Medium-Entropy Alloys with Promising Mechanical Properties

New AlxCo50?xCu50?xMnx (x = 2.5, 10, and 15 atomic %, at%) immiscible medium-entropy alloys (IMMEAs) were designed based on the cobalt-copper binary system. Aluminum, a strong B2 phase former, was added to enhance yield strength ultimate tensile strength, while manganese for additional solid solution strengthening. In this work, microstructural evolution mechanical properties of Al-Co-Cu-Mn system are examined. The exhibit separation into dual face-centered cubic (FCC) phases due miscibility gap with formation CoAl-rich phases. hard significantly contribute alloys, whereas FCC elongation mitigating brittle fracture. Consequently, analysis B2-strengthened IMMEAs suggest that new alloy design methodology results in good combination ductility.