J. Mater. Sci. Technol. ›› 2016, Vol. 32 ›› Issue (12): 1267-1273.DOI: 10.1016/j.jmst.2016.01.005
• Orginal Article • Previous Articles Next Articles
Liu Huan1,Xue Feng2,Bai Jing2,Ma Aibin1,*(),Jiang Jinghua1
Received:
2015-04-02
Accepted:
2015-05-14
Online:
2016-12-20
Published:
2017-02-16
Contact:
Ma Aibin
Liu Huan,Xue Feng,Bai Jing,Ma Aibin,Jiang Jinghua. Formation Behavior of 14H Long Period Stacking Ordered Structure in Mg-Y-Zn Cast Alloys with Different α-Mg Fractions[J]. J. Mater. Sci. Technol., 2016, 32(12): 1267-1273.
Alloy code | Alloy | Mg | Y | Zn |
---|---|---|---|---|
I | Mg86Y8Zn6 | 85.93 | 7.95 | 6.12 |
II | Mg88Y8Zn4 | 87.83 | 8.13 | 4.04 |
III | Mg89Y8Zn3 | 88.70 | 8.04 | 3.26 |
Table 1. Analyzed chemical compositions of as-cast alloys (at.%)
Alloy code | Alloy | Mg | Y | Zn |
---|---|---|---|---|
I | Mg86Y8Zn6 | 85.93 | 7.95 | 6.12 |
II | Mg88Y8Zn4 | 87.83 | 8.13 | 4.04 |
III | Mg89Y8Zn3 | 88.70 | 8.04 | 3.26 |
Test point | Chemical composition (at.%) --------------------------- | ||
---|---|---|---|
Mg | Y | Zn | |
A | 96.59 | 2.60 | 0.81 |
B | 87.58 | 7.10 | 5.32 |
C | 34.21 | 20.28 | 45.51 |
D | 84.13 | 13.25 | 2.42 |
E | 69.92 | 25.74 | 4.34 |
F | 95.90 | 3.24 | 0.86 |
G | 95.04 | 3.98 | 0.98 |
Table 2. EDS results of the test points marked in Fig. 3
Test point | Chemical composition (at.%) --------------------------- | ||
---|---|---|---|
Mg | Y | Zn | |
A | 96.59 | 2.60 | 0.81 |
B | 87.58 | 7.10 | 5.32 |
C | 34.21 | 20.28 | 45.51 |
D | 84.13 | 13.25 | 2.42 |
E | 69.92 | 25.74 | 4.34 |
F | 95.90 | 3.24 | 0.86 |
G | 95.04 | 3.98 | 0.98 |
Fig. 4. (a) TEM image of Mg12YZn phase in alloy III, (b) SAED patterns of Mg12YZn phase in (a), (c) TEM image of α-Mg grain with lamellar contrasts in alloy III, (d) SAED patterns of α-Mg phase in (c); (e) TEM image of α-Mg grain in alloy II.
Fig. 6. Microstructures of as-cast alloy I annealed for (a) 1 h, (d) 5 h, (g) 40 h, (j) 100 h; alloy II annealed for (b) 1 h, (e) 5 h, (h) 25 h, (k) 50 h; alloy III annealed for (c) 0.5 h, (f) 2 h, (i) 6 h, (l) 25 h.
Fig. 7. (a) TEM image of 14H lamellas in alloy I annealed for 100 h, (b) SAED patterns of 14H lamellas in (a), (c) TEM image of 14H lamellas in alloy III annealed for 100 h, (d) SAED patterns of 14H lamellas in (c).
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