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

doi:10.1007/s40195-022-01379-6

Abstract

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-_xCu_x 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

Haoyang Yu, Wei Fang, Jinfei Zhang, Jiaxin Huang, Jiaohui Yan, Xin Zhang, Juan Wang, Jianhang Feng, Fuxing Yin. Microstructural Evolution of Co₃₅Cr₂₅Fe₃₀Ni₁₀ TRIP Complex Concentrated Alloy with the Addition of Minor Cu and Its Effect on Mechanical Properties[J]. Acta Metallurgica Sinica (English Letters), 2022, 35(8): 1291-1300.

Figures/Tables 11

Table 1 Composition of the homogenized HEAs (at.%) measured by EPMA

Alloys	Co	Cr	Fe	Ni	Cu
Cu0	34.86 $\pm$ 0.2	25.96 $\pm$ 0.1	29.29 $\pm$ 0.3	9.88 $\pm$ 0.2	0
Cu2	34.59 $\pm$ 0.3	25.46 $\pm$ 0.2	28.64 $\pm$ 0.3	9.75 $\pm$ 0.3	1.55 $\pm$ 0.2
Cu4	33.52 $\pm$ 0.3	25.67 $\pm$ 0.1	28.15 $\pm$ 0.2	9.18 $\pm$ 0.2	3.48 $\pm$ 0.2

Fig. 1 SEM images (a1, b1, c1 and d1), EBSD IPF maps a2, b2 and c2, and EBSD phase maps a3, b3 and c3 of Cu0 a, Cu2 b Cu4 c, d alloys annealed at 900 °C for 1 h

Fig. 2 EPMA maps of the Cu0 a, Cu2 b and Cu4 c HEAs annealed at 900 °C for 1 h

Fig. 3 a Micrographs of Cu4 alloys with overlaid grid sampling points under secondary electronic imaging mode, b statistical Cu concentration distributions of (Co35Cr25Fe30Ni10)100-xCux alloys

Fig. 4 EPMA Cu-distribution maps of the Cu4 alloys annealed at 900 °C for 5 min a, 1 h b and 6 h c

Fig. 5 Representative Cu concentration profiles across FCC grain boundaries of Cu4 alloys annealed at 900 °C for 5 min a, 1 h b and 6 h c

Fig. 6 Typical tensile stress-strain curves of Cu0, Cu2 and Cu4 alloys annealed at 900 °C for 1 h

Fig. 7 EBSD results of Cu0 a, Cu2 b and Cu4 c alloys annealed at 900 °C for 1 h after tensile test: a1, b1, c1 IPF maps, a2, b2, c2 phase maps

Fig. 8 Intrinsic stacking fault energies of the HEAs at 0 K calculated by DFT method

Fig. 9 Calculated equilibrium phase percentage versus temperature of Cu0 a, Cu2 b and Cu4 c alloys. The element percentage versus temperature plots of $\gamma^{\prime}$ phase d

Table 2 Values of mixing enthalpy, $ \Delta H_{{{\text{AB}}}}^{{{\text{mix}}}}$ (kJ/mol), acquired from Miedema’s scheme, for binary phases between the constituent elements in equiatomic compositions [48]

	Co	Cr	Fe	Ni	Cu
Co	-	- 4	- 1	0	6
Cr	-	-	- 1	- 7	12
Fe	-	-	-	- 2	13
Ni	-	-	-	-	4

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

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