J. Mater. Sci. Technol. ›› 2020, Vol. 42: 85-96.DOI: 10.1016/j.jmst.2019.08.051
Special Issue: High Entropy Alloys 2018-2020
• Orginal Article • Previous Articles Next Articles
L.W. Lan, X.J. Wang, R.P. Guo, H.J. Yang*(), J.W. Qiao*()
Received:
2019-05-23
Revised:
2019-07-16
Accepted:
2019-08-09
Published:
2020-04-01
Online:
2020-04-16
Contact:
Yang H.J.,Qiao J.W.
L.W. Lan, X.J. Wang, R.P. Guo, H.J. Yang, J.W. Qiao. Effect of environments and normal loads on tribological properties of nitrided Ni45(FeCoCr)40(AlTi)15 high-entropy alloys[J]. J. Mater. Sci. Technol., 2020, 42: 85-96.
H+ | K+ | Na+ | Ca2+ | Mg2+ | Cl- | SO42- |
---|---|---|---|---|---|---|
10 | 0.015 | 0.015 | 0.17 | 0.022 | 0.022 | 5.19 |
Table 1 Chemical composition of acid rain (×10-3 mol/L).
H+ | K+ | Na+ | Ca2+ | Mg2+ | Cl- | SO42- |
---|---|---|---|---|---|---|
10 | 0.015 | 0.015 | 0.17 | 0.022 | 0.022 | 5.19 |
Al | Co | Cr | Fe | Ni | Ti |
---|---|---|---|---|---|
3 | 9 | 6 | 8 | 10 | 4 |
7.5 | 13.3 | 13.3 | 13.3 | 45 | 7.5 |
Table 2 Valence electrons and content of elements in alloys (at.%).
Al | Co | Cr | Fe | Ni | Ti |
---|---|---|---|---|---|
3 | 9 | 6 | 8 | 10 | 4 |
7.5 | 13.3 | 13.3 | 13.3 | 45 | 7.5 |
Composition (at.%) | Al | Co | Cr | Fe | Ni | Ti |
---|---|---|---|---|---|---|
DR | 6.6. | 14.4 | 12.9 | 14.3 | 47.5 | 4.4 |
ID | 2.3 | 12.2 | 19.3 | 12.2 | 41.7 | 12.4 |
Table 3 Chemical compositions of different regions in as-cast Ni45(FeCoCr)40(AlTi)15 HEAs.
Composition (at.%) | Al | Co | Cr | Fe | Ni | Ti |
---|---|---|---|---|---|---|
DR | 6.6. | 14.4 | 12.9 | 14.3 | 47.5 | 4.4 |
ID | 2.3 | 12.2 | 19.3 | 12.2 | 41.7 | 12.4 |
Fig. 7. Friction coefficient as a function of sliding time for HEAs: (a) as-cast alloys, in air; (b) as-cast alloys, in acid rain; (c) nitrided alloys, in air; and (d) nitrided alloys, in acid rain.(e)as-cast alloys, in deionized water.(f) nitride alloys, in deionized water.
Friction coefficient | ||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|
Air | Rain | Deionized | ||||||||||
5 N | 7 N | 10 N | 12 N | 5 N | 7 N | 10 N | 12 N | 5 N | 7 N | 10 N | 12 N | |
As-cast | 0.21 | 0.42 | 0.38 | 0.18 | 0.15 | 0.14 | 0.10 | 0.20 | 0.38 | 0.41 | 0.49 | 0.38 |
Nitrided | 0.6 | 0.6 | 0.58 | 0.58 | 0.4 | 0.39 | 0.38 | 0.38 | 0.5 | 0.32 | 0.42 | 0.31 |
Table 4 Average friction coefficient of as-cast and nitrided Ni45(FeCoCr)40(AlTi)15 HEAs under different conditions.
Friction coefficient | ||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|
Air | Rain | Deionized | ||||||||||
5 N | 7 N | 10 N | 12 N | 5 N | 7 N | 10 N | 12 N | 5 N | 7 N | 10 N | 12 N | |
As-cast | 0.21 | 0.42 | 0.38 | 0.18 | 0.15 | 0.14 | 0.10 | 0.20 | 0.38 | 0.41 | 0.49 | 0.38 |
Nitrided | 0.6 | 0.6 | 0.58 | 0.58 | 0.4 | 0.39 | 0.38 | 0.38 | 0.5 | 0.32 | 0.42 | 0.31 |
Fig. 8. Wear rate as a function of the normal load for as-cast and nitrided Ni45(FeCoCr)40(AlTi)15 HEAs: (C-A): as-cast, in air; (C-R): as-cast, in acid rain; (N-A): nitrided alloy, in air; and (N-R): nitrided alloy, in acid rain. (C-D): as-cast, in deionized water (N-D): nitride alloy, in deionized water.
Wear rate (× 10-5 mm3/(N m)) | ||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|
Air | Rain | Deionized | ||||||||||
5 N | 7 N | 10 N | 12 N | 5 N | 7 N | 10 N | 12 N | 5 N | 7 N | 10 N | 12 N | |
As-cast | 5.91 | 7.31 | 9.85 | 7.01 | 6.61 | 7.30 | 5.90 | 4.65 | 5.25 | 3.89 | 4.35 | 6.69 |
Nitrided | 1.60 | 3.85 | 4.73 | 2.66 | 0.40 | 0.43 | 0.58 | 2.80 | 2.02 | 3.35 | 4.04 | 4.26 |
Table 5 Average wear rate of as-cast and nitrided Ni45(FeCoCr)40(AlTi)15 HEAs under different conditions.
Wear rate (× 10-5 mm3/(N m)) | ||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|
Air | Rain | Deionized | ||||||||||
5 N | 7 N | 10 N | 12 N | 5 N | 7 N | 10 N | 12 N | 5 N | 7 N | 10 N | 12 N | |
As-cast | 5.91 | 7.31 | 9.85 | 7.01 | 6.61 | 7.30 | 5.90 | 4.65 | 5.25 | 3.89 | 4.35 | 6.69 |
Nitrided | 1.60 | 3.85 | 4.73 | 2.66 | 0.40 | 0.43 | 0.58 | 2.80 | 2.02 | 3.35 | 4.04 | 4.26 |
Fig. 10. SEM images of worn surface under different conditions: (a) as-cast alloys, in air; (b) as-cast alloys, in acid rain, (c) nitrided alloys, in air, (d) nitrided alloy, in acid rain, (e) as-cast alloys, in deionized water, and (f) nitrided alloys, in deionized water.
Al | Co | Cr | Fe | Ni | Ti | O | ||
---|---|---|---|---|---|---|---|---|
5 N | Surface | 6.8 | 11.0 | 11.3 | 11.3 | 36.7 | 6.5 | 16.4 |
Debris | 3.2 | 5.6 | 5.7 | 5.4 | 18.1 | 3.4 | 58.7 | |
7 N | Surface | 7.2 | 13.4 | 13.9 | 14.0 | 42.8 | 6.3 | 2.4 |
Debris | 5.5 | 9.0 | 9.2 | 8.8 | 29.6 | 5.6 | 32.3 | |
10 N | Surface | 6.6 | 12.9 | 13.5 | 13.7 | 40.5 | 6.1 | 6.7 |
Debris | 3.4 | 5.6 | 5.7 | 5.5 | 17.8 | 3.4 | 58.7 | |
12 N | Surface | 7.8 | 11.8 | 12.1 | 11.6 | 37.9 | 6.8 | 12.0 |
Debris | 4.1 | 4.6 | 5.4 | 4.9 | 15.6 | 3.2 | 62.2 |
Table 6 EDS analysis results of wear debris and worn surfaces of as-cast Ni45(FeCoCr)40(AlTi)15 HEAs in air (at.%).
Al | Co | Cr | Fe | Ni | Ti | O | ||
---|---|---|---|---|---|---|---|---|
5 N | Surface | 6.8 | 11.0 | 11.3 | 11.3 | 36.7 | 6.5 | 16.4 |
Debris | 3.2 | 5.6 | 5.7 | 5.4 | 18.1 | 3.4 | 58.7 | |
7 N | Surface | 7.2 | 13.4 | 13.9 | 14.0 | 42.8 | 6.3 | 2.4 |
Debris | 5.5 | 9.0 | 9.2 | 8.8 | 29.6 | 5.6 | 32.3 | |
10 N | Surface | 6.6 | 12.9 | 13.5 | 13.7 | 40.5 | 6.1 | 6.7 |
Debris | 3.4 | 5.6 | 5.7 | 5.5 | 17.8 | 3.4 | 58.7 | |
12 N | Surface | 7.8 | 11.8 | 12.1 | 11.6 | 37.9 | 6.8 | 12.0 |
Debris | 4.1 | 4.6 | 5.4 | 4.9 | 15.6 | 3.2 | 62.2 |
Al | Co | Cr | Fe | Ni | Ti | O | Cl | ||
---|---|---|---|---|---|---|---|---|---|
5 N | Surface | 4.3 | 13.1 | 10.4 | 10.9 | 51.4 | 5.1 | 4.7 | 0.2 |
Debris | 5.7 | 8.9 | 8.8 | 8.6 | 24.0 | 3.6 | 38.9 | 1.5 | |
7 N | Surface | 3.9 | 12.6 | 12.8 | 13.1 | 41.9 | 5.0 | 10.3 | 0.4 |
Debris | 6.2 | 8.9 | 9.0 | 7.9 | 44.8 | 6.2 | 18.1 | 0.2 | |
10 N | Surface | 1.7 | 14.1 | 14.6 | 13.8 | 41.7 | 7.3 | 6.5 | 0.3 |
Debris | 5.8 | 12.0 | 8.0 | 9.4 | 52.5 | 5.8 | 6.9 | 0.1 | |
12 N | Surface | 10.4 | 10.2 | 7.5 | 7.3 | 43.5 | 12.8 | 7.8 | 0.5 |
Debris | 4.6 | 12.4 | 11.4 | 12.4 | 44.2 | 4.5 | 9.7 | 0.8 |
Table 7 EDS analysis results of wear debris and worn surfaces of nitrided Ni45(FeCoCr)40(AlTi)15 HEAs in air (at.%).
Al | Co | Cr | Fe | Ni | Ti | O | Cl | ||
---|---|---|---|---|---|---|---|---|---|
5 N | Surface | 4.3 | 13.1 | 10.4 | 10.9 | 51.4 | 5.1 | 4.7 | 0.2 |
Debris | 5.7 | 8.9 | 8.8 | 8.6 | 24.0 | 3.6 | 38.9 | 1.5 | |
7 N | Surface | 3.9 | 12.6 | 12.8 | 13.1 | 41.9 | 5.0 | 10.3 | 0.4 |
Debris | 6.2 | 8.9 | 9.0 | 7.9 | 44.8 | 6.2 | 18.1 | 0.2 | |
10 N | Surface | 1.7 | 14.1 | 14.6 | 13.8 | 41.7 | 7.3 | 6.5 | 0.3 |
Debris | 5.8 | 12.0 | 8.0 | 9.4 | 52.5 | 5.8 | 6.9 | 0.1 | |
12 N | Surface | 10.4 | 10.2 | 7.5 | 7.3 | 43.5 | 12.8 | 7.8 | 0.5 |
Debris | 4.6 | 12.4 | 11.4 | 12.4 | 44.2 | 4.5 | 9.7 | 0.8 |
Fig. 11. XPS analysis of nitrided Ni45(FeCoCr)40(AlTi)15 HEAs in acid rain: (a) Al element; (b) Co element; (c) Cr element; (d) Fe element; (e) Ni element; (f) Ti element; (g) N element; and (h) O element.
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