J. Mater. Sci. Technol. ›› 2020, Vol. 45: 133-145.DOI: 10.1016/j.jmst.2019.11.021
• Research Article • Previous Articles Next Articles
Xueze Jina, Wenchen Xua,*(), Zhongze Yanga, Can Yuana, Debin Shana, Bugang Tenga, Bo Cheng Jinb
Received:
2019-08-22
Revised:
2019-10-23
Accepted:
2019-11-05
Published:
2020-05-15
Online:
2020-05-27
Contact:
Wenchen Xu
Xueze Jin, Wenchen Xu, Zhongze Yang, Can Yuan, Debin Shan, Bugang Teng, Bo Cheng Jin. Analysis of abnormal texture formation and strengthening mechanism in an extruded Mg-Gd-Y-Zn-Zr alloy[J]. J. Mater. Sci. Technol., 2020, 45: 133-145.
Fig. 1. Optical microstructures and TEM images of the as-cast and solution-treated Mg-6Gd-4Y-0.5Zn-0.5 Zr alloy: (a, b) optical microstructures of as-cast and solution-treated alloy; (c, d) TEM images of as-cast and solution-treated alloy and the corresponding SAED; (e-h) HAADF image and corresponding element distribution of as-cast alloy.
Fig. 2. Optical microstructures of as-cast alloy after extrusion under different extrusion conditions: (a-c) 300 °C and extrusion ratio of 9, 16 and 25; (d-f) 350 °C and extrusion ratio of 9, 16 and 25; (g-k) 400 °C and extrusion ratio of 9, 16 and 25.
Fig. 3. Optical microstructures of solution-treated alloy after extrusion under different extrusion conditions: (a-c) 300 °C and extrusion ratio of 9, 16 and 25; (d-f) 350 °C and extrusion ratio of 9, 16 and 25; (g-k) 400 °C and extrusion ration of 9, 16 and 25.
Fig. 5. TEM images of as-cast and solution-treated alloy after extrusion at 350 °C with an extrusion ration of 9: (a) as-cast alloy; (b) solution-treated alloy.
Fig. 6. Inverse pole figures (extrusion direction) of solution-treated (a-k) and as-cast (l, m) alloy after extrusion under different extrusion conditions: (a-c) 300 °C with extrusion ration of 9, 16 and 25, respectively; (d-f) 350 °C with extrusion ration of 9, 16 and 25, respectively; (g-k) 400 °C with extrusion ration of 9, 16 and 25, respectively; (l) 350 °C with extrusion ration of 25; (m) 400 °C with extrusion ration of 25.
Fig. 7. IPF maps and corresponding inverse pole figures of solution-treated alloy: (a-c) extruded at 300 °C with extrusion ration of 9; (d-f) annealed at 450 °C for 0.5 h of extruded alloy (300 °C with extrusion ration of 9); (g) extruded at 400 °C with extrusion ratio of 25.
Fig. 8. EBSD maps highlighting the grains with c-axis parallel to the extrusion direction (tolerance of 30°) and corresponding inverse pole figures of solution-treated alloy: (a) extruded at 300 °C with the extrusion ration of 9; (b) annealed at 450 °C for 0.5 h of extruded alloy (300 °C with the extrusion ration of 9); (c) extruded at 400 °C with the extrusion ratio of 25.
Fig. 9. Schematic graphs of continuous dynamic recrystallization of Mg alloys: (a) dislocations pile-up near the grain boundaries, (b) the formation of subgrains; (c) continuous accumulation basal dislocations of to subgrains; (d) continuous accumulation c-Burgers vector dislocations to subgrains.
Temperature (°C) | 300 | 350 | 400 | ||||||
---|---|---|---|---|---|---|---|---|---|
Ratio | 9 | 16 | 25 | 9 | 16 | 25 | 9 | 16 | 25 |
TYS (MPa) | 299.1 | 265.6 | 249.4 | 272.4 | 253.2 | 227.3 | 239.4 | 229.1 | 213.0 |
UTS (MPa) | 349.1 | 327.5 | 320.1 | 337.4 | 327.0 | 316.9 | 323.6 | 317.7 | 306.4 |
EL (%) | 13.8 | 14.4 | 21.5 | 19.3 | 19.5 | 20.9 | 18.1 | 19.5 | 22.5 |
CYS (MPa) | 294.8 | 254.5 | 247.1 | 274.2 | 248.0 | 233.7 | 244.6 | 233.7 | 210.9 |
CYS/TYS | 0.99 | 0.96 | 0.99 | 1.01 | 0.98 | 1.03 | 1.02 | 1.02 | 0.99 |
Table 1 Mechanical properties of solution-treated Mg alloy tested at room temperature.
Temperature (°C) | 300 | 350 | 400 | ||||||
---|---|---|---|---|---|---|---|---|---|
Ratio | 9 | 16 | 25 | 9 | 16 | 25 | 9 | 16 | 25 |
TYS (MPa) | 299.1 | 265.6 | 249.4 | 272.4 | 253.2 | 227.3 | 239.4 | 229.1 | 213.0 |
UTS (MPa) | 349.1 | 327.5 | 320.1 | 337.4 | 327.0 | 316.9 | 323.6 | 317.7 | 306.4 |
EL (%) | 13.8 | 14.4 | 21.5 | 19.3 | 19.5 | 20.9 | 18.1 | 19.5 | 22.5 |
CYS (MPa) | 294.8 | 254.5 | 247.1 | 274.2 | 248.0 | 233.7 | 244.6 | 233.7 | 210.9 |
CYS/TYS | 0.99 | 0.96 | 0.99 | 1.01 | 0.98 | 1.03 | 1.02 | 1.02 | 0.99 |
Temperature (°C) | 300 | 350 | 400 | ||||||
---|---|---|---|---|---|---|---|---|---|
Ratio | 9 | 16 | 25 | 9 | 16 | 25 | 9 | 16 | 25 |
TYS (MPa) | 289.4 | 242.4 | 243.8 | 241.7 | 227.1 | 229.5 | 221.4 | 219.6 | 221.9 |
UTS (MPa) | 331.4 | 298.6 | 300.1 | 300.7 | 289.1 | 294.5 | 289.0 | 295.2 | 300.2 |
EL (%) | 12.3 | 13.7 | 14.1 | 13.7 | 15.3 | 18.5 | 14.0 | 17.0 | 18.1 |
CYS (MPa) | 284.6 | 248.9 | 230.8 | 239.0 | 235.5 | 220.2 | 220.6 | 219.9 | 217.5 |
CYS/TYS | 0.98 | 1.03 | 0.95 | 0.99 | 1.04 | 0.96 | 1.00 | 1.00 | 0.98 |
Table 2 Mechanical properties of as-cast Mg alloy tested at room temperature.
Temperature (°C) | 300 | 350 | 400 | ||||||
---|---|---|---|---|---|---|---|---|---|
Ratio | 9 | 16 | 25 | 9 | 16 | 25 | 9 | 16 | 25 |
TYS (MPa) | 289.4 | 242.4 | 243.8 | 241.7 | 227.1 | 229.5 | 221.4 | 219.6 | 221.9 |
UTS (MPa) | 331.4 | 298.6 | 300.1 | 300.7 | 289.1 | 294.5 | 289.0 | 295.2 | 300.2 |
EL (%) | 12.3 | 13.7 | 14.1 | 13.7 | 15.3 | 18.5 | 14.0 | 17.0 | 18.1 |
CYS (MPa) | 284.6 | 248.9 | 230.8 | 239.0 | 235.5 | 220.2 | 220.6 | 219.9 | 217.5 |
CYS/TYS | 0.98 | 1.03 | 0.95 | 0.99 | 1.04 | 0.96 | 1.00 | 1.00 | 0.98 |
Fig. 10. Yield stress (a), ultimate tensile stress (b), elongation (c) and compression yield stress (d) of as-cast and solution-treated alloy after extrusion under different conditions.
Fig. 11. SEM micrographs of the fracture surface of as-cast (a, b) and solution-treated (c, d) after extrusion at 300 °C/9 (a, c) and 400 °C/25 (b, d).
Fig. 12. (a) Compression stress-strain curves of the S400E25 sample along different directions and (b) Hall-Petch plots of the yield strength of as-cast and solution-treated alloy under different extrusion conditions and annealing conditions.
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