J. Mater. Sci. Technol. ›› 2017, Vol. 33 ›› Issue (10): 1141-1146.DOI: 10.1016/j.jmst.2017.03.019
• Orginal Article • Previous Articles Next Articles
Yang Donghuia(), Chen Jianqinga, Chen Weipinga, Wang Leia, Wang Huib, Jiang Jinghuaa, Ma Aibina
Received:
2016-09-01
Revised:
2016-11-01
Accepted:
2016-11-29
Online:
2017-10-25
Published:
2018-01-25
About author:
1 These two authors contributed equally to this paper.
Yang Donghui, Chen Jianqing, Chen Weiping, Wang Lei, Wang Hui, Jiang Jinghua, Ma Aibin. Fabrication of cellular Zn-Mg alloy foam by gas release reaction via powder metallurgical approach[J]. J. Mater. Sci. Technol., 2017, 33(10): 1141-1146.
Weight ratio of Zn to Mg | Notation |
---|---|
1:0 | Zn |
9:1 | Zn9Mg1 |
7:3 | Zn7Mg3 |
5:5 | Zn5Mg5 |
Table 1 Powder mixture compositions for making Zn/Zn-Mg alloy foamable precursors, CaCO3 additions are all 2.0 wt%.
Weight ratio of Zn to Mg | Notation |
---|---|
1:0 | Zn |
9:1 | Zn9Mg1 |
7:3 | Zn7Mg3 |
5:5 | Zn5Mg5 |
Fig. 1. Section images of foaming results of the precursor without Mg addition (a) and the Zn9M1 precursor without sintering treatment (b). The CaCO3 additions were both 2.0 wt% and the foaming temperatures were 610-640 °C.
Fig. 2. Section images of foaming results of the precursor with different compositions. All the CaCO3 additions were 2.0 wt% and the foaming temperatures were 610-640 °C.
Fig. 4. XRD patterns of Zn9Mg1 precursor without sintering treatment. The XRD peaks of MgO, ZnO and CaCO3 are not indexed because all of their intensities are much lower than Mg and Zn.
Fig. 6. XRD patterns of Zn-Mg precursors with different compositions after sintered at 360-400 °C for 11-16 h. The XRD peaks of MgO and ZnO are not indexed because both of their intensities are much lower than those of the intermetallics, Mg, Zn and CaCO3.
Fig. 8. SEM images of the precursor without sintering treatment (a) and the precursors after sintering treatment at 360-400 °C for 11-16 h: (b) Zn9Mg1, (c) Zn7Mg3, (d) Zn5Mg5. The positions marked by (+) and red arrows were analyzed by EDS.
Element | Position 1 | Position 2 | Position 3 | Position 4 | Position 5 | Position 6 | Position 7 | Position 8 | Position 9 |
---|---|---|---|---|---|---|---|---|---|
Zn | - | 92.85 | 57.57 | 81.16 | 29.21 | 55.51 | 4.38 | 72.76 | 48.57 |
Mg | 92.13 | - | 24.91 | 14.55 | 59.85 | 34.28 | 85.74 | 3.34 | 50.69 |
Zn/Mg | - | - | 2.31 | 5.57 | 0.48 | 1.62 | 0.05 | 21.78 | 0.96 |
Table 2 EDS analysis result of the positions marked in Fig. 8.
Element | Position 1 | Position 2 | Position 3 | Position 4 | Position 5 | Position 6 | Position 7 | Position 8 | Position 9 |
---|---|---|---|---|---|---|---|---|---|
Zn | - | 92.85 | 57.57 | 81.16 | 29.21 | 55.51 | 4.38 | 72.76 | 48.57 |
Mg | 92.13 | - | 24.91 | 14.55 | 59.85 | 34.28 | 85.74 | 3.34 | 50.69 |
Zn/Mg | - | - | 2.31 | 5.57 | 0.48 | 1.62 | 0.05 | 21.78 | 0.96 |
Fig. 9. TG-DSC curves of the Zn9Mg1 foamable precursor (CaCO3 addition is 2.0 wt%). The precursor was foamed during the heating process that affects the TG curves. The experiment was stopped at the temperature of 700 °C due to precursor foaming in the crucible.
Fig. 11. XRD pattern of cell wall of Zn9Mg1 foam. The XRD peaks of MgO and CaO are not indexed because their intensities are much lower than MgZn2 and Zn.
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