J. Mater. Sci. Technol. ›› 2021, Vol. 85: 158-168.DOI: 10.1016/j.jmst.2021.01.024
• Research Article • Previous Articles Next Articles
Xiaopei Wang*(), Yoshiaki Morisada, Hidetoshi Fujii*()
Received:
2020-10-14
Revised:
2021-01-04
Accepted:
2021-01-09
Published:
2021-09-20
Online:
2021-02-19
Contact:
Xiaopei Wang,Hidetoshi Fujii
About author:
fujii@jwri.osaka-u.ac.jp (H. Fujii).Xiaopei Wang, Yoshiaki Morisada, Hidetoshi Fujii. Interface strengthening in dissimilar double-sided friction stir spot welding of AZ31/ZK60 magnesium alloys by adjustable probes[J]. J. Mater. Sci. Technol., 2021, 85: 158-168.
Al | Zn | Mn | Si | Zr | Mg | |
---|---|---|---|---|---|---|
AZ31 | 2.83 | 0.79 | 0.35 | 0.026 | -- | Bal. |
ZK60 | -- | 5.23 | 0.003 | 0.002 | 0.465 | Bal. |
Table 1 Chemical composition of AZ31 base metal and ZK60 base metal (wt. %).
Al | Zn | Mn | Si | Zr | Mg | |
---|---|---|---|---|---|---|
AZ31 | 2.83 | 0.79 | 0.35 | 0.026 | -- | Bal. |
ZK60 | -- | 5.23 | 0.003 | 0.002 | 0.465 | Bal. |
Yield strength/MPa | Ultimate tensile strength/MPa | Elongation/% | |
---|---|---|---|
AZ31 | 190 | 272 | 20 |
ZK60 | 118 | 253 | 11 |
Table 2 Mechanical properties of the as-received AZ31 base metal and ZK60 base metal.
Yield strength/MPa | Ultimate tensile strength/MPa | Elongation/% | |
---|---|---|---|
AZ31 | 190 | 272 | 20 |
ZK60 | 118 | 253 | 11 |
Fig. 1. (a) Illustration of AZ31/ZK60 magnesium alloy dissimilar welding by the Flat DSAT FSSW, (b) physical photos of probe, shoulder and fixing part, and (c) the schematic illustration of the welding process.
Fig. 4. EPMA results showing the elemental distributions of the dissimilar AZ31/ZK60 joint: (a) Zn distribution, (b) Al distribution and (c) Zr distribution.
Fig. 5. EPMA results showing the microstructure and elemental distributions of (a) ZK60 base metal, (b) area Z1 (Fig. 4(b)) and (c) area Z2 (Fig. 4(b)).
Fig. 7. Corresponding (0001) pole figures in different areas: (a) AZ31 side in area I1, (b) ZK60 side in area I1, (c) AZ31 side in area I2 and (d) ZK60 side in area I2.
Fig. 8. EBSD maps showing the microstructure, grain boundaries and corresponding (0001) pole figures of the dissimilar joint at ZK60 side: (a, d, g) area T1 (Fig. 3(b)), (b, e, h) area T2 (Fig. 3(b)) and (c, f, i) area T3 (Fig. 3(c)).
Fig. 10. TEM results of the welded interface in area I1 (Fig. 3(b)): (a) microstructure, (b) EDS line scan results, and (c-f) EDS mapping analysis results of Mg, O, Al and Zr.
Fig. 11. TEM results of the welded interface in area I2 (Fig. 3c): (a) microstructure, (b1-b3) selected area diffraction patterns of corresponding areas in (a), (c) magnification of the corresponding region in (a), and (d-g) EDS mapping analysis results of Mg, O, Al and Zr.
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