J. Mater. Sci. Technol. ›› 2018, Vol. 34 ›› Issue (7): 1149-1161.DOI: 10.1016/j.jmst.2017.11.044
• Orginal Article • Previous Articles Next Articles
Yu-Shi Yia, Yi Mengab(), Dan-Qing Lia, Sumio Sugiyamac, Jun Yanagimotoc
Received:
2017-10-08
Revised:
2017-11-10
Accepted:
2017-11-16
Online:
2018-07-10
Published:
2018-07-22
Yu-Shi Yi, Yi Meng, Dan-Qing Li, Sumio Sugiyama, Jun Yanagimoto. Partial melting behavior and thixoforming properties of extruded magnesium alloy AZ91 with and without addition of SiC particles with a volume fraction of 15%[J]. J. Mater. Sci. Technol., 2018, 34(7): 1149-1161.
Al | Zn | Mn | Si | Cu | Ni | Fe | Be | Mg |
---|---|---|---|---|---|---|---|---|
9.30 | 0.70 | 0.23 | 0.02 | 0.001 | 0.001 | 0.002 | 0.0015 | Bal. |
Table 1 Chemical composition of commercial Mg alloy AZ91 (wt%).
Al | Zn | Mn | Si | Cu | Ni | Fe | Be | Mg |
---|---|---|---|---|---|---|---|---|
9.30 | 0.70 | 0.23 | 0.02 | 0.001 | 0.001 | 0.002 | 0.0015 | Bal. |
Fig. 8. SEM images of ECAE-processed AZ91 and extruded AZ91-SiCp composite specimens cooled from different temperatures after isothermal holding for 20 s.
Fig. 13. Flow stress-true strain curves of different materials compressed at different temperatures for strain rate and an isothermal holding time of 1/s and 20 s, respectively.
Forming temperature (°C) | Center region | Edge region | ||
---|---|---|---|---|
Volume fraction of former liquid phase (%) | Volume fraction of SiCp (%) | Volume fraction of former liquid phase (%) | Volume fraction of SiCp (%) | |
510 | 4.18 ± 2.05 | 18.36 ± 1.52 | 4.61± 2.62 | 14.19 ± 1.55 |
530 | 8.12 ± 4.17 | 18.16 ± 1.22 | 13.87 ± 6.55 | 14.22 ± 1.50 |
550 | 22.06 ± 5.52 | 18.05 ± 1.50 | 28.67 ± 7.05 | 14.36 ± 1.52 |
Table 2 Results of image analysis on the SEM micrographs of AZ91-SiCp composite specimens compressed at different temperatures after an isothermal holding time for 20 s.
Forming temperature (°C) | Center region | Edge region | ||
---|---|---|---|---|
Volume fraction of former liquid phase (%) | Volume fraction of SiCp (%) | Volume fraction of former liquid phase (%) | Volume fraction of SiCp (%) | |
510 | 4.18 ± 2.05 | 18.36 ± 1.52 | 4.61± 2.62 | 14.19 ± 1.55 |
530 | 8.12 ± 4.17 | 18.16 ± 1.22 | 13.87 ± 6.55 | 14.22 ± 1.50 |
550 | 22.06 ± 5.52 | 18.05 ± 1.50 | 28.67 ± 7.05 | 14.36 ± 1.52 |
Fig. 16. Yield strengths of different materials with different liquid fractions obtained from experiments and regression analysis for the strain rate and isothermal holding time of 1/s and 20 s, respectively.
Fig. 17. Illustration of microstructural evolution of ECAE processed AZ91 and extruded AZ91-SiCp composite specimens during semisolid compression after an isothermal holding for 20 s.
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