J. Mater. Sci. Technol. ›› 2017, Vol. 33 ›› Issue (4): 359-366.DOI: 10.1016/j.jmst.2016.05.006
Special Issue: 2016-2017摩擦搅拌焊接专辑; 2017-2018年Mg合金专题
• Orginal Article • Previous Articles Next Articles
Shi Hui1,2, Chen Ke1,2,*(), Liang Zhiyuan3, Dong Fengbo4, Yu Taiwu1,2, Dong Xianping1,2, Zhang Lanting1,2, Shan Aidang1,2
Received:
2015-06-12
Revised:
2015-08-19
Accepted:
2015-09-28
Online:
2017-04-15
Published:
2017-05-24
Contact:
Chen Ke
Shi Hui, Chen Ke, Liang Zhiyuan, Dong Fengbo, Yu Taiwu, Dong Xianping, Zhang Lanting, Shan Aidang. Intermetallic Compounds in the Banded Structure and Their Effect on Mechanical Properties of Al/Mg Dissimilar Friction Stir Welding Joints[J]. J. Mater. Sci. Technol., 2017, 33(4): 359-366.
Alloy | Cu | Fe | Mn | Si | Ti | Cr | Zn | Al | Mg |
---|---|---|---|---|---|---|---|---|---|
Al | 0.25 | 0.49 | 0.09 | 0.70 | 0.01 | 0.15 | - | Bal. | 0.97 |
Mg | - | 0.01 | 0.51 | 0.02 | - | - | 1.05 | 1.02 | Bal. |
Table 1 Chemical composition of Al and Mg alloy (wt%)
Alloy | Cu | Fe | Mn | Si | Ti | Cr | Zn | Al | Mg |
---|---|---|---|---|---|---|---|---|---|
Al | 0.25 | 0.49 | 0.09 | 0.70 | 0.01 | 0.15 | - | Bal. | 0.97 |
Mg | - | 0.01 | 0.51 | 0.02 | - | - | 1.05 | 1.02 | Bal. |
Fig. 1. Schematic illustration of the relative position between tool and workpiece marked with plunge depth and insertion depth of the pin and the shoulder. The green tool geometry represents the position where pin contacts workpiece surface, the blue one the position where shoulder contacts workpiece surface, and the red one the position of actual insertion of tool.
Fig. 3. Microstructure of WN/TMAZ (Mg) boundary at various heights of R-900: (a-d) corresponding to microstructure found in the locations d-g marked in Fig. 2(d).
Fig. 4. BS microstructure of R-700: (a,b) showing the IMC particles/lamellae in region b as marked in Fig. 2(b), and (c) showing crack in region h as marked in Fig. 2(b).
Point | Mg | Al | Others | Possible phases |
---|---|---|---|---|
1 | 96.93 | 0.82 | 2.25 | Mg |
2 | 75.95 | 18.79 | 5.26 | Mg+ Al12Mg17 |
3 | 2.08 | 94.83 | 3.09 | Al |
4 | 73.46 | 21.50 | 5.04 | Mg+ Al12Mg17 |
5 | 66.24 | 29.69 | 4.07 | Mg+ Al12Mg17 |
6 | 56.32 | 40.28 | 3.40 | Al12Mg17 |
7 | 63.43 | 33.12 | 3.45 | Mg+ Al12Mg17 |
Table 2 Chemical composition for the points marked in Fig. 3 by EDS analysis (wt%)
Point | Mg | Al | Others | Possible phases |
---|---|---|---|---|
1 | 96.93 | 0.82 | 2.25 | Mg |
2 | 75.95 | 18.79 | 5.26 | Mg+ Al12Mg17 |
3 | 2.08 | 94.83 | 3.09 | Al |
4 | 73.46 | 21.50 | 5.04 | Mg+ Al12Mg17 |
5 | 66.24 | 29.69 | 4.07 | Mg+ Al12Mg17 |
6 | 56.32 | 40.28 | 3.40 | Al12Mg17 |
7 | 63.43 | 33.12 | 3.45 | Mg+ Al12Mg17 |
Fig. 10. Fracture paths in the BS zone after tensile test: (a and c) showing fracture path in R-700 and R-800 respectively, (b and d) showing magnified views of the locations marked in (a and c), respectively.
Fig. 11. Fractographs of the welds to the Mg side: (a) R-700 under lower magnification, (b) R-700 under higher magnification, (c) R-800 under lower magnification, (d) R-800 under higher magnification.
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