J. Mater. Sci. Technol. ›› 2021, Vol. 73: 1-8.DOI: 10.1016/j.jmst.2020.08.065
• Research Article • Next Articles
Lu Yanga, Zhuo Chenga, Weiwei Zhua,b, Cancan Zhaoa, Fuzeng Rena,*(
)
Received:2020-07-01
Revised:2020-08-11
Accepted:2020-08-17
Published:2021-05-20
Online:2021-05-20
Contact:
Fuzeng Ren
About author:*E-mail address: renfz@sustech.edu.cn (F. Ren).Lu Yang, Zhuo Cheng, Weiwei Zhu, Cancan Zhao, Fuzeng Ren. Significant reduction in friction and wear of a high-entropy alloy via the formation of self-organized nanolayered structure[J]. J. Mater. Sci. Technol., 2021, 73: 1-8.
Fig. 1. Phase and microstructure of (CoCrFeNi)90Ag10 HEA. (a) XRD patterns of the 12 h-ball milled powder and the as-sintered bulk alloy; (b) SEM image; (c) EBSD IPF map; and (d) the size distribution of Ag precipitates.
| Element | Co | Cr | Fe | Ni | Ag |
|---|---|---|---|---|---|
| Co | - | -4 | -1 | 0 | 19 |
| Cr | -4 | - | -1 | -7 | 27 |
| Fe | -1 | -7 | - | -2 | 28 |
| Ni | 0 | 27 | -2 | - | 15 |
Table 1 The values of $ΔH^{AB}_{mix}$ΔHmixAB (kJ/mol) in binary alloys calculated by Miedema’s model [23].
| Element | Co | Cr | Fe | Ni | Ag |
|---|---|---|---|---|---|
| Co | - | -4 | -1 | 0 | 19 |
| Cr | -4 | - | -1 | -7 | 27 |
| Fe | -1 | -7 | - | -2 | 28 |
| Ni | 0 | 27 | -2 | - | 15 |
Fig. 2. EBSD phase map (a) and the SEM image (b) of the SPSed bulk (CoCrFeNi)90Ag10 HEA.
Fig. 3. Phase and microstructure characterization of CoCrFeNi HEA. (a) XRD pattern; (b) SEM image; (c) EBSD IPF map; and (d) grain size distribution.
Fig. 4. Coefficients of friction as a function of sliding distance (a) and wear rates (b) of CoCrFeNi and (CoCrFeNi)90Ag10 HEAs upon sliding against alumina ball with a load of 5 N and sliding velocity of 0.1 m/s.
Fig. 5. SEM images of worn surfaces and 3D profile of CoCrFeNi (a, b) and (CoCrFeNi)90Ag10 (c, d) alloys after sliding against alumina ball for 500 m with a load of 5 N and velocity of 0.1 m/s. SD denotes the sliding direction. The insets in (a) and (c) are the typical EDX spectra obtained from the surface.
Fig. 6. Sliding wear-induced ND-SD cross-sectional subsurface microstructure of CoCrFeNi HEA. (a) Bright-field TEM image; (b) a high-magnification bright-field TEM image of the nanocrystalline (NC) layer and corresponding SAED pattern (inset); (c) a dark-field image corresponding to (b); (d) a high-magnification bright-field image and corresponding SAED pattern of nanolaminated layer in (a); and (e) a dark-field TEM image corresponding to (d); (f) a high-magnification bright-field TEM image of the deformation layer in (a); and (g) SAED pattern corresponding to (f).
Fig. 7. Sliding wear-induced ND-SD cross-sectional subsurface microstructure of (CoCrFeNi)90Ag10 HEA. (a) HAADF-STEM image; (b) high-magnification HAADF-STEM image of the selected area in (a) with the EDX spectra obtained from the matrix (point 1) and the Ag layer (point 2); (c) bright-field TEM image corresponding to (a); (d) high-magnification bright-field TEM image of the selected area in (c); (e) the SAED pattern of nanolayered region selected in (d); and (f) high-resolution TEM image obtained at the interfaces between CoCrFeNi matrix and the Ag layer.
Fig. 8. Stacking faults and nanoscale deformation twins present in the CoCrFeNi matrix nanolayers in (CoCrFeNi)90Ag10 HEA after sliding against alumina ball for 500 m with a load of 5 N and velocity of 0.1 m/s.
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