J. Mater. Sci. Technol. ›› 2017, Vol. 33 ›› Issue (9): 919-925.DOI: 10.1016/j.jmst.2017.05.003
Special Issue: 2017-2018年Mg合金专题
• Orginal Article • Previous Articles Next Articles
Received:
2016-11-01
Revised:
2016-12-13
Accepted:
2016-12-15
Online:
2017-09-20
Published:
2017-10-16
Contact:
Kim W.J.
About author:
1 The authors contributed equally to this work.
Kwak T.Y., Kim W.J.. Superplastic behavior of an ultrafine-grained Mg-13Zn-1.55Y alloy with a high volume fraction of icosahedral phases prepared by high-ratio differential speed rolling[J]. J. Mater. Sci. Technol., 2017, 33(9): 919-925.
Fig. 1. SEM micrographs of ZW132 in (a) homogenized cast state and (b) after HRDSR. High magnification SEM micrographs of HRDSRed ZW132 showing (c) elongated I-phase eutectic pockets and (d) finely fragmented eutectic pockets and I-phase particles dispersed over the matrix composed of ultra fine grains. The EDS analysis result on the phase in (a) is presented in Table 1.
Position | Mg (at.%) | Zn (at.%) | Y (at.%) |
---|---|---|---|
1 | 60.55 | 32.71 | 6.74 |
2 | 87.21 | 11.19 | 1.60 |
3 | 87.56 | 10.44 | 2.01 |
4 | 83.08 | 14.32 | 2.60 |
Table 1 EDS analysis on particles in Fig. 1(a) and Fig. 9(a).
Position | Mg (at.%) | Zn (at.%) | Y (at.%) |
---|---|---|---|
1 | 60.55 | 32.71 | 6.74 |
2 | 87.21 | 11.19 | 1.60 |
3 | 87.56 | 10.44 | 2.01 |
4 | 83.08 | 14.32 | 2.60 |
Fig. 3. Strain rate-stress relationship of the HRDSR ZW132 alloy constructed in double logarithm plots at (a) 443 K, (b) 473 K, (c) 523 K, (d) 573 K and (e) 623 K.
Fig. 4. Strain rate-stress (in log-log format) curves for the HRDSR ZW132 alloy at various temperatures constructed using the first SRC cycle curves. The dotted curves represent the prediction by Eq. (1).
Fig. 5. True stress-true strain curves for the HRDSR ZW132 alloy obtained (a) from 443 K to 623 K at a strain rate of 10-3 s-1 and (b) at different strain rates at 523 K.
Fig. 8. Low (a, c) and high (b, d) magnification SEM micrographs of HRDSR ZW132 alloy at the gauge (a, b) and grip (c, d) regions after tensile elongation of 1021% at 523 K and 1 × 10-3 s-1.
Fig. 9. (a) Secondary electron image and (b) Mg, (c) Zn and (d) Y element mappings in gauge region of HRDSR ZW132 alloy after tensile elongation of 1021% at 523 K and 1 × 10-3 s-1. The EDS analysis results on the particles in (a) are presented in Table 1.
Fig. 10. Optical micrographs of the HRDSR ZW132 alloy in the gauge (a) and grip regions (b) after the tensile elongation of 1021% at 523 K and 1 × 10-3 s-1.
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