Acta Metallurgica Sinica (English Letters) ›› 2022, Vol. 35 ›› Issue (8): 1291-1300.DOI: 10.1007/s40195-022-01379-6

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

Haoyang Yu1, Wei Fang1,2(), Jinfei Zhang1, Jiaxin Huang1, Jiaohui Yan1, Xin Zhang1,2, Juan Wang3, Jianhang Feng1, Fuxing Yin1,2()   

  1. 1School of Materials Science and Engineering, Hebei University of Technology, Tianjin 300132, China
    2Tianjin Key Laboratory of Materials Laminating Fabrication and Interface Control Technology, Tianjin 300132, China
    3Institute of Materials and Processing, Guangdong Academy of Sciences, Guangzhou 510650, China

Abstract:

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

Key words: Complex concentrated alloy, High entropy alloy, Cu addition, Microstructures, Mechanical properties