J. Mater. Sci. Technol. ›› 2019, Vol. 35 ›› Issue (10): 2365-2374.DOI: 10.1016/j.jmst.2019.05.053
• Orginal Article • Previous Articles Next Articles
Mingquan Zhanga, Yan Fenga, Jinghuai Zhanga*(
), Shujuan Liub, Qiang Yangc, Zhuang Liud, Rongguang Lie, Jian Mengc, Ruizhi Wua
Received:2019-03-16
Revised:2019-05-03
Accepted:2019-05-06
Online:2019-10-05
Published:2019-08-28
Contact:
Zhang Jinghuai
Mingquan Zhang, Yan Feng, Jinghuai Zhang, Shujuan Liu, Qiang Yang, Zhuang Liu, Rongguang Li, Jian Meng, Ruizhi Wu. Development of extruded Mg-6Er-3Y-1.5Zn-0.4Mn (wt.%) alloy with high strength at elevated temperature[J]. J. Mater. Sci. Technol., 2019, 35(10): 2365-2374.
| Alloy | Er | Y | Zn | Mn | Mg |
|---|---|---|---|---|---|
| Mg-6Er-3Y-1.5Zn-0.4 Mn | 5.72 | 2.93 | 1.69 | 0.43 | Bal. |
Table 1 Chemical composition of the investigated alloy (wt.%).
| Alloy | Er | Y | Zn | Mn | Mg |
|---|---|---|---|---|---|
| Mg-6Er-3Y-1.5Zn-0.4 Mn | 5.72 | 2.93 | 1.69 | 0.43 | Bal. |
Fig. 1. (a) OM and (b) SEM micrographs of the as-cast alloy.
Fig. 2. XRD patterns of (a) as-cast, (b) solid-solution treated and (c) as-extruded samples.
Fig. 3. TEM images and corresponding SAED patterns of the LPSO phases: (a) and (b) 14H LPSO phase; (c) and (d) 18R LPSO phase.
Fig. 4. (a) DSC heating curve of the as-cast alloy and (b) SEM micrograph of the solid-solution treated alloy.
Fig. 5. (a) SEM image of the as-extruded alloy and (b) high-magnified SEM image showing the typical microstructure of DRXed region.
Fig. 6. EBSD analysis of the as-extruded sample: (a) IPF map with the reference direction parallel to ED. The horizontal direction is parallel to ED; (b) grain boundary map; (c) basal slip Schmid factor distribution map along ED; (d) grain size distributions; (e) misorientation angle distributions; (f) basal slip Schmid factor distributions.
Fig. 7. IPF maps of (a) DRXed grains and (b) un-DRXed grains with the reference direction parallel to ED. The horizontal direction is parallel to ED. (0001) pole figures of (c) whole region, (d) un-DRXed region and (e) DRXed region of the as-extruded sample.
Fig. 8. TEM analysis of the un-DRXed region: (a)-(c) bright field (BF)-TEM images; (d) SAED pattern.
Fig. 9. TEM analysis of the DRX-ed region: (a) and (b) BF-TEM image of the DRXed grains; (c) SAED pattern of the lath-shaped phase.
Fig. 10. TEM analysis of a typical DRXed grain: (a) and (b) BF-TEM image; (c) SAED pattern; (d) high-resolution-TEM image with FFT pattern.
Fig. 11. Typical tensile stress-strain curves of the studied alloys tested at different temperatures.
| Temperature (°C) | UTS (MPa) | YS (MPa) | ε (%) |
|---|---|---|---|
| 25 | 354 ± 5.8 | 316 ± 4.2 | 8.1 ± 1.1 |
| 200 | 336 ± 3.7 | 298 ± 2.9 | 11.7 ± 1.6 |
| 250 | 326 ± 2.1 | 285 ± 3.3 | 14.5 ± 1.3 |
| 300 | 301 ± 2.6 | 274 ± 2.8 | 17.3 ± 2.5 |
Table 2 Average tensile properties including UTS, YS and ε of the investigated alloy.
| Temperature (°C) | UTS (MPa) | YS (MPa) | ε (%) |
|---|---|---|---|
| 25 | 354 ± 5.8 | 316 ± 4.2 | 8.1 ± 1.1 |
| 200 | 336 ± 3.7 | 298 ± 2.9 | 11.7 ± 1.6 |
| 250 | 326 ± 2.1 | 285 ± 3.3 | 14.5 ± 1.3 |
| 300 | 301 ± 2.6 | 274 ± 2.8 | 17.3 ± 2.5 |
Fig. 12. Histogram of the high temperature strength (300 °C) comparison in the studied alloy and previously reported Mg-RE based alloys with comparative compositions [[52], [53], [54], [55], [56]].
Fig. 13. Thermal diffusivity and thermal conductivity of the as-cast and as-extruded alloys.
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