J. Mater. Sci. Technol. ›› 2021, Vol. 85: 106-117.DOI: 10.1016/j.jmst.2020.12.045
• Research Article • Previous Articles Next Articles
Yan Zoua, Xiaodong Wua,*(
), Songbai Tanga, Qianqian Zhua, Hui Songa, Mingxing Guob, Lingfei Caoa,c,**()
Received:2020-09-16
Revised:2020-12-09
Published:2021-09-20
Online:2021-02-01
Contact:
Xiaodong Wu,Lingfei Cao
About author:**International Joint Laboratory for Light Alloys (Ministry of Education), College of Materials Science and Engineering, Chongqing University, Chongqing, 400044, China. caolingfei@cqu.edu.cn (L. Cao).Yan Zou, Xiaodong Wu, Songbai Tang, Qianqian Zhu, Hui Song, Mingxing Guo, Lingfei Cao. Investigation on microstructure and mechanical properties of Al-Zn-Mg-Cu alloys with various Zn/Mg ratios[J]. J. Mater. Sci. Technol., 2021, 85: 106-117.
| wt.% | at.% | |||||||
|---|---|---|---|---|---|---|---|---|
| Zn | Mg | Cu | Zn/Mg | Zn | Mg | Cu | Zn/Mg | |
| A1 | 4.2 | 2.8 | 1.0 | 1.50 | 1.78 | 3.20 | 0.44 | 0.56 |
| A2 | 5.6 | 2.5 | 1.6 | 2.24 | 2.41 | 2.89 | 0.74 | 0.83 |
| A3 | 8.0 | 2.8 | 1.0 | 2.86 | 3.48 | 3.27 | 0.45 | 1.06 |
| A4 | 8.0 | 1.8 | 1.0 | 4.44 | 3.48 | 2.11 | 0.45 | 1.65 |
| A5 | 8.0 | 0.8 | 1.0 | 10.0 | 3.48 | 0.94 | 0.45 | 3.72 |
Table 1 Nominal chemical compositions of the investigated alloys.
| wt.% | at.% | |||||||
|---|---|---|---|---|---|---|---|---|
| Zn | Mg | Cu | Zn/Mg | Zn | Mg | Cu | Zn/Mg | |
| A1 | 4.2 | 2.8 | 1.0 | 1.50 | 1.78 | 3.20 | 0.44 | 0.56 |
| A2 | 5.6 | 2.5 | 1.6 | 2.24 | 2.41 | 2.89 | 0.74 | 0.83 |
| A3 | 8.0 | 2.8 | 1.0 | 2.86 | 3.48 | 3.27 | 0.45 | 1.06 |
| A4 | 8.0 | 1.8 | 1.0 | 4.44 | 3.48 | 2.11 | 0.45 | 1.65 |
| A5 | 8.0 | 0.8 | 1.0 | 10.0 | 3.48 | 0.94 | 0.45 | 3.72 |
| Alloy | Number density (m-3) | Volume fraction (%) | Phase fraction | T' | η' | |||
|---|---|---|---|---|---|---|---|---|
| T' | η' | Radius (nm) | Radius (nm) | Thickness (nm) | Aspect ratio | |||
| A1 | 4.43 × 1022 | 2.61 | 100 % | 0% | 5.2 ± 1.1 | - | - | - |
| A2 | 1.61 × 1023 | 5.10 | 82% | 18 % | 4.2 ± 0.9 | 5.5 ± 1.1 | 3.5 ± 0.9 | 3.3 ± 0.8 |
| A3 | 7.48 × 1023 | 2.18 | 64% | 36 % | 1.9 ± 0.4 | 2.3 ± 0.7 | 1.7 ± 0.5 | 2.8 ± 0.5 |
| A4 | 5.62 × 1023 | 3.67 | 49% | 51 % | 2.3 ± 0.5 | 3.2 ± 0.7 | 2.3 ± 0.6 | 2.9 ± 0.6 |
| A5 | 9.03 × 1022 | 8.99 | 19 % | 81 % | 5.1 ± 1.0 | 11.6 ± 3.4 | 2.6 ± 0.7 | 9.7 ± 3.9 |
Table 2 Precipitates information of peak aged alloys at 150 °C.
| Alloy | Number density (m-3) | Volume fraction (%) | Phase fraction | T' | η' | |||
|---|---|---|---|---|---|---|---|---|
| T' | η' | Radius (nm) | Radius (nm) | Thickness (nm) | Aspect ratio | |||
| A1 | 4.43 × 1022 | 2.61 | 100 % | 0% | 5.2 ± 1.1 | - | - | - |
| A2 | 1.61 × 1023 | 5.10 | 82% | 18 % | 4.2 ± 0.9 | 5.5 ± 1.1 | 3.5 ± 0.9 | 3.3 ± 0.8 |
| A3 | 7.48 × 1023 | 2.18 | 64% | 36 % | 1.9 ± 0.4 | 2.3 ± 0.7 | 1.7 ± 0.5 | 2.8 ± 0.5 |
| A4 | 5.62 × 1023 | 3.67 | 49% | 51 % | 2.3 ± 0.5 | 3.2 ± 0.7 | 2.3 ± 0.6 | 2.9 ± 0.6 |
| A5 | 9.03 × 1022 | 8.99 | 19 % | 81 % | 5.1 ± 1.0 | 11.6 ± 3.4 | 2.6 ± 0.7 | 9.7 ± 3.9 |
Fig. 1. (a) Age hardening curves of five alloys aged at 150 °C, (b) locally enlarged view of ageing curves of alloys A3 and A4 near peak hardness, (c) the peak hardness and time to peak ageing for alloys with different Zn/Mg ratios.
Fig. 2. Mechanical properties of peak aged samples: (a) engineering stress?strain curves, (b) strength and elongation values as a function of Zn/Mg ratios.
Fig. 3. OM images of samples after solution treatment with corresponding grain size histogram: (a) A1, (b) A2, (c) A3, (d) A4, (e) A5.
Fig. 4. Fracture morphologies of peak aged samples: (a) A1, (b) A2, (c) A3, (d) A4, (e) A5.
Fig. 5. PFZ width of peak aged samples: (a) A1, (b) A2, (c) A3, (d) A4, (e) A5.
Fig. 6. BF images of peak aged samples viewed along [100]Al and corresponding SADPs: (a) A1, (b) A2, (c) A3, (d) A4, (e) A5, (f) schematic illustration of SADP of η′ and T′ phase in aluminium matrix along the [100]Al zone axis.
Fig. 7. Bright field images of peak aged samples viewed along [110]Al: (a) A1, (b) A2, (c) A3, (d) A4, (e) A5.
Fig. 8. HRTEM image and corresponding FFT diffractogram of plate-like precipitate in peak aged alloy A2.
Fig. 9. HRTEM images and corresponding FFT diffractogram of small-sized precipitate in peak aged alloy A5.
Fig. 10. The parameters of precipitates in five alloys as a function of Zn/Mg ratios: (a) total solute content; (b) precipitate number density; (c) precipitate phase fraction; (d) radius of T′ phase; (e) radius and thickness of η' phase; (f) aspect ratio of η' phase.
Fig. 11. The reconstruction of representative precipitates in peak aged condition with corresponding concentration profiles: (a) T′ phase in alloy A1, (b) η′ phase in alloy A5, (c) T′ phase in alloy A5.
Fig. 12. Comparison of yield strength for model prediction and experiment.
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