Microstructural Evolution of Co35Cr25Fe30Ni10 TRIP Complex Concentrated Alloy with the Addition of Minor Cu and Its Effect on Mechanical Properties

The influences of minor Cu addition (2 and 4 at.%) on the microstructural evolution room-temperature mechanical property metastable Co35Cr25Fe30Ni10 are systemically investigated in present study. results indicate that thermally induced hexagonal close-packed (HCP) phase is absent when was added, due to increase stacking fault energy (SFE). 2%-Cu-added alloys showed largest total elongation 69% among three alloys. With content reaching at.%, heterogeneous grain structures composed coarse grains (~ 9 μm) fine Cu-rich precipitates near boundary observed, showing highest yield strength. Additionally, segregation state quantitatively characterized by electron probe microanalysis (EPMA). And effects microstructures tensile properties (Co35Cr25Fe30Ni10)100-xCux also discussed. findings beneficial comprehensively understand Cu-containing complex concentrated