J. Mater. Sci. Technol. ›› 2017, Vol. 33 ›› Issue (7): 712-717.DOI: 10.1016/j.jmst.2016.09.016
• Orginal Article • Previous Articles Next Articles
Jiang Hui, Jiang Li, Qiao Dongxu, Lu Yiping*(), Wang Tongmin, Cao Zhiqiang, Li Tingju
Received:
2016-04-19
Revised:
2016-06-21
Accepted:
2016-06-22
Online:
2017-07-20
Published:
2017-08-29
Contact:
Lu Yiping
Jiang Hui, Jiang Li, Qiao Dongxu, Lu Yiping, Wang Tongmin, Cao Zhiqiang, Li Tingju. Effect of Niobium on Microstructure and Properties of the CoCrFeNbxNi High Entropy Alloys[J]. J. Mater. Sci. Technol., 2017, 33(7): 712-717.
Elements | Co | Cr | Fe | Ni | Nb |
---|---|---|---|---|---|
Co | - | -4 | -1 | 0 | -25 |
Cr | - | - | -1 | -7 | -7 |
Fe | - | - | - | -2 | -16 |
Ni | - | - | - | - | -30 |
Nb | - | - | - | - | - |
Table 1 The mixing enthalpy ΔHmix (kJ mol-1) of atom pairs
Elements | Co | Cr | Fe | Ni | Nb |
---|---|---|---|---|---|
Co | - | -4 | -1 | 0 | -25 |
Cr | - | - | -1 | -7 | -7 |
Fe | - | - | - | -2 | -16 |
Ni | - | - | - | - | -30 |
Nb | - | - | - | - | - |
Fig. 2. Low magnification SEM images of the CoCrFeNbxNi HEAs: (a) x = 0, (b) x = 0.25, (c) x = 0.45, (d) x = 0.5, (e) x = 0.75, (f) x = 1.0, and (g) x = 1.2.
Alloys | Regions | Co | Cr | Fe | Ni | Nb |
---|---|---|---|---|---|---|
Nb0 | 24.58 | 25.08 | 25.16 | 25.18 | - | |
Nb0.25 | A | 23.27 | 25.24 | 25.31 | 23.09 | 3.09 |
E | 23.77 | 15.73 | 16.6 | 19.1 | 24.8 | |
Nb0.45 | E | 22.51 | 16.7 | 17.31 | 18.83 | 24.65 |
Nb0.5 | B | 21.63 | 15.9 | 18.63 | 15.61 | 28.24 |
E | 21.31 | 19.6 | 20.45 | 19.27 | 19.37 | |
Nb0.75 | B | 20.51 | 16.8 | 18.29 | 15.31 | 29.09 |
E | 21.59 | 16.1 | 19.07 | 18.73 | 24.52 | |
Nb1.0 | B | 19.42 | 17.21 | 17.95 | 15.2 | 30.22 |
E | 22.88 | 16.1 | 19.83 | 25.12 | 16.08 | |
Nb1.2 | B | 18.21 | 17.71 | 17.52 | 15.16 | 31.41 |
E | 20.74 | 16.6 | 15.95 | 18.01 | 28.69 |
Table 2 Composition of different regions in the CoCrFeNbxNi alloys by EDS (at.%)
Alloys | Regions | Co | Cr | Fe | Ni | Nb |
---|---|---|---|---|---|---|
Nb0 | 24.58 | 25.08 | 25.16 | 25.18 | - | |
Nb0.25 | A | 23.27 | 25.24 | 25.31 | 23.09 | 3.09 |
E | 23.77 | 15.73 | 16.6 | 19.1 | 24.8 | |
Nb0.45 | E | 22.51 | 16.7 | 17.31 | 18.83 | 24.65 |
Nb0.5 | B | 21.63 | 15.9 | 18.63 | 15.61 | 28.24 |
E | 21.31 | 19.6 | 20.45 | 19.27 | 19.37 | |
Nb0.75 | B | 20.51 | 16.8 | 18.29 | 15.31 | 29.09 |
E | 21.59 | 16.1 | 19.07 | 18.73 | 24.52 | |
Nb1.0 | B | 19.42 | 17.21 | 17.95 | 15.2 | 30.22 |
E | 22.88 | 16.1 | 19.83 | 25.12 | 16.08 | |
Nb1.2 | B | 18.21 | 17.71 | 17.52 | 15.16 | 31.41 |
E | 20.74 | 16.6 | 15.95 | 18.01 | 28.69 |
Alloys | Yield stress σy (MPa) | Fracture strength σmax (MPa) | Plastic strain, ?p (%) | Fracture strain, ?max (%) |
---|---|---|---|---|
Nb0 | 145 | - | >50 | >50 |
Nb0.25 | 423 | 2016 | 34.8 | 39.76 |
Nb0.45 | 1474.9 | 2558 | 21.3 | 27.9 |
Nb0.5 | 1414 | 2276 | 17.7 | 24.57 |
Nb0.75 | - | 2078 | - | 13.46 |
Nb1.0 | - | 1198 | - | 6.83 |
Nb1.2 | - | 940 | - | - |
Table 3 Mechanical properties of the CoCrFeNbxNi (x = 0, 0.25, 0.45, 0.5, 0.75, 1.0 and 1.2) alloys
Alloys | Yield stress σy (MPa) | Fracture strength σmax (MPa) | Plastic strain, ?p (%) | Fracture strain, ?max (%) |
---|---|---|---|---|
Nb0 | 145 | - | >50 | >50 |
Nb0.25 | 423 | 2016 | 34.8 | 39.76 |
Nb0.45 | 1474.9 | 2558 | 21.3 | 27.9 |
Nb0.5 | 1414 | 2276 | 17.7 | 24.57 |
Nb0.75 | - | 2078 | - | 13.46 |
Nb1.0 | - | 1198 | - | 6.83 |
Nb1.2 | - | 940 | - | - |
Fig. 5. Vickers hardness (a), wear mass loss (b), wear scar depth (c) and width (d) curves of CoCrFeNbxNi HEAs (x = 0, 0.25, 0.45, 0.5, 0.75, 1.0 and 1.2), (e) and (f) the typical 2-D and 3-D surface profilometry images of the wear track after sliding test, respectively.
Fig. 6. Microstructure of worn surface of the CoCrFeNbxNi alloys with various contents: (a) Nb0, (b) Nb0.25, (c) Nb0.45, (d) Nb0.5, (e) Nb0.75, (f) Nb1.0 and (g) Nb1.2. And the insert in Fig. 6(f) is the EDS analysis result of wear debris.
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