J. Mater. Sci. Technol. ›› 2021, Vol. 78: 20-29.DOI: 10.1016/j.jmst.2020.11.017
• Review Article • Previous Articles Next Articles
Chunquan Liua,b, Xianhua Chena,b,c,*(), Yuan Yuana,b, Wei Zhangd, Yusheng Zhangd, Fusheng Pana,b
Received:
2020-07-14
Revised:
2020-08-23
Accepted:
2020-08-24
Published:
2021-07-10
Online:
2020-11-13
Contact:
Xianhua Chen
About author:
*International Joint Laboratory for Light Alloys (MOE),College of Materials Science and Engineering, Chongqing University, Chongqing,400045, China.E-mail address:xhchen@cqu.edu.cn (X. Chen).Chunquan Liu, Xianhua Chen, Yuan Yuan, Wei Zhang, Yusheng Zhang, Fusheng Pan. Altered age-hardening behavior in the ultrafine-grained surface layer of Mg-Zn-Y-Ce-Zr alloy processed by sliding friction treatment[J]. J. Mater. Sci. Technol., 2021, 78: 20-29.
Fig. 3. (a) Bright-field TEM image of the SFTed layer aged for 8 h, (b) the dark-field from the yellow frame in (a), (c) HAADF-STEM image of the SFTed layer aged for 8 h, (d) bright-field TEM image of the SFTed layer aged for 16 h, (e) the dark-field from the yellow frame in (d), (f) HAADF-STEM image of the SFTed layer aged for 16 h.
Fig. 4. (a) Bright-field TEM image of the precipitates inside a grain, (b) corresponding SAED patterns, (c) HRTEM image of framed area c in (a), (d) HRTEM image of interface between Mg3Zn3Y2 phase and Mg matrix.
Fig. 5. (a-c) Bright and dark-field TEM image of the un-SFTed layer aged 12 h, (d) magnified image from the yellow frame in (a), (e) the dark-field image of (d), (f) HAADF-STEM image of the DRXed area in un-SFTed layer aged 12 h.
Fig. 6. (a, d) Bright-field and dark-field TEM micrographs of the precipitates near the dislocations, (b, e) magnified images of the yellow frames in (a) and (d), (c) HRTEM image of the precipitates near the dislocation, (f) the magnified image of the frame in (c) and corresponding FFT patterns.
Fig. 7. (a) Bright-field TEM micrographs of SFTed layer aged for 60 h, (b) HAADF-STEM image of the SFTed area aged for 60 h, (c, d) bright-field TEM micrographs of un-SFTed layer aged for 60 h.
Sample ID | Position | Average size (nm) | Inter-particle spacing (nm) | Contribution (HV) |
---|---|---|---|---|
SFTed-0 h | Intragranular | 22.1 | 44.5 | 17.6 |
SFTed-8 h | Intragranular | 25.3 | 30.2 | 26.9 |
SFTed-16 h | Intragranular | 40.6 | 25.2 | 36.4 |
SFTed-60 h | Intragranular | 42.5 | 24.3 | 38.1 |
un-SFTed-0 h | unDRXed area | 89.6 | 185.4 | 22.6 |
DRXed area | 26.4 | 49.1 | ||
un-SFTed-12 h | unDRXed area | 103.2 | 155.8 | 34.8 |
DRXed area | 29.5 | 30.6 | ||
un-SFTed-60 h | unDRXed area | 106.3 | 152.3 | 36.7 |
DRXed area | 32.1 | 29.4 |
Table 1 Summary of position, average size, inter-particle spacing of secondary phase and corresponding contribution for hardness at varies ageing states.
Sample ID | Position | Average size (nm) | Inter-particle spacing (nm) | Contribution (HV) |
---|---|---|---|---|
SFTed-0 h | Intragranular | 22.1 | 44.5 | 17.6 |
SFTed-8 h | Intragranular | 25.3 | 30.2 | 26.9 |
SFTed-16 h | Intragranular | 40.6 | 25.2 | 36.4 |
SFTed-60 h | Intragranular | 42.5 | 24.3 | 38.1 |
un-SFTed-0 h | unDRXed area | 89.6 | 185.4 | 22.6 |
DRXed area | 26.4 | 49.1 | ||
un-SFTed-12 h | unDRXed area | 103.2 | 155.8 | 34.8 |
DRXed area | 29.5 | 30.6 | ||
un-SFTed-60 h | unDRXed area | 106.3 | 152.3 | 36.7 |
DRXed area | 32.1 | 29.4 |
Samples | Grain size, d (μm) | Contribution (HV) | ρ (×1014 m-2) | Contribution (HV) |
---|---|---|---|---|
SFTed-0 h | 0.192 | 27.9 | 3.31 | 24.1 |
SFTed-8 h | 0.739 | 14.2 | 2.71 | 21.8 |
SFTed-16 h | 0.848 | 13.3 | 2.32 | 20.2 |
SFTed-60 h | 1.412 | 10.3 | 1.26 | 14.9 |
un-SFTed-0 h | 2.361 | 7.9 | 3.62 | 25.2 |
un-SFTed-12 h | 3.156 | 6.9 | 3.24 | 23.8 |
un-SFTed-60 h | 3.564 | 6.5 | 1.31 | 15.2 |
Table 2 The crystallite size, dislocation density and corresponding contribution for hardness at different ageing states.
Samples | Grain size, d (μm) | Contribution (HV) | ρ (×1014 m-2) | Contribution (HV) |
---|---|---|---|---|
SFTed-0 h | 0.192 | 27.9 | 3.31 | 24.1 |
SFTed-8 h | 0.739 | 14.2 | 2.71 | 21.8 |
SFTed-16 h | 0.848 | 13.3 | 2.32 | 20.2 |
SFTed-60 h | 1.412 | 10.3 | 1.26 | 14.9 |
un-SFTed-0 h | 2.361 | 7.9 | 3.62 | 25.2 |
un-SFTed-12 h | 3.156 | 6.9 | 3.24 | 23.8 |
un-SFTed-60 h | 3.564 | 6.5 | 1.31 | 15.2 |
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