J. Mater. Sci. Technol. ›› 2018, Vol. 34 ›› Issue (1): 102-111.DOI: 10.1016/j.jmst.2017.11.015
Special Issue: FSW-and-FSP-articles 2018
• Orginal Article • Previous Articles Next Articles
Xiangqian Liuab, Huijie Liua*(), Tianhao Wanga, Xiangguo Wanga, Si Yanga
Received:
2017-03-08
Revised:
2017-04-27
Accepted:
2017-05-23
Online:
2018-01-20
Published:
2018-02-09
Contact:
Liu Huijie
Xiangqian Liu, Huijie Liu, Tianhao Wang, Xiangguo Wang, Si Yang. Correlation between microstructures and mechanical properties of high-speed friction stir welded aluminum hollow extrusions subjected to axial forces[J]. J. Mater. Sci. Technol., 2018, 34(1): 102-111.
Chemical composition (wt%) | Mechanical properties | ||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|
Si | Mg | Mn | Fe | Cu | Cr | Zn | Ti | Al | Tensile strength | Elongation | Vickers hardness |
0.7 | 0.6 | 0.5 | 0.35 | 0.3 | 0.3 | 0.2 | 0.1 | Bal | 294 MPa | 6.2% | 90-95 Hv |
Table 1 Chemical compositions and mechanical properties of AA6005A-T6 aluminum hollow extrusions.
Chemical composition (wt%) | Mechanical properties | ||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|
Si | Mg | Mn | Fe | Cu | Cr | Zn | Ti | Al | Tensile strength | Elongation | Vickers hardness |
0.7 | 0.6 | 0.5 | 0.35 | 0.3 | 0.3 | 0.2 | 0.1 | Bal | 294 MPa | 6.2% | 90-95 Hv |
Dimensions of tool | Welding parameters | |||||
---|---|---|---|---|---|---|
Shoulder diameter | Pin diameter | Pin length | Rotation speed | Welding speed | Axial force | Tilt angle |
10 mm | 7.4 mm | 3.8 mm | 2000 r/min | 2000 mm/min | 15-21 kN | 1.5° |
Table 2 Dimensions of tool and welding parameters used in the experiments.
Dimensions of tool | Welding parameters | |||||
---|---|---|---|---|---|---|
Shoulder diameter | Pin diameter | Pin length | Rotation speed | Welding speed | Axial force | Tilt angle |
10 mm | 7.4 mm | 3.8 mm | 2000 r/min | 2000 mm/min | 15-21 kN | 1.5° |
Fig. 9. TEM microstructures in the BM: (a) dislocations, (b) precipitates observed in low magnification, (c) precipitates observed in high magnification, (d) precipitate-free zone (PFZ) along the grain boundary.
P(kN) | TP (°C) | tD (s) | ||||
---|---|---|---|---|---|---|
NZ | TMAZ | HAZ | NZ | TMAZ | HAZ | |
15 | 434 | 370 | 305 | 2.9 | 2.6 | 2.2 |
17 | 473 | 401 | 332 | 3.8 | 3.5 | 3.0 |
19 | 500 | 423 | 351 | 4.5 | 4.2 | 3.6 |
21 | 522 | 441 | 367 | 5.2 | 4.9 | 4.2 |
Table 3 Peak temperature and dwelling time at high temperature in different zones obtained using various axial forces.
P(kN) | TP (°C) | tD (s) | ||||
---|---|---|---|---|---|---|
NZ | TMAZ | HAZ | NZ | TMAZ | HAZ | |
15 | 434 | 370 | 305 | 2.9 | 2.6 | 2.2 |
17 | 473 | 401 | 332 | 3.8 | 3.5 | 3.0 |
19 | 500 | 423 | 351 | 4.5 | 4.2 | 3.6 |
21 | 522 | 441 | 367 | 5.2 | 4.9 | 4.2 |
Fig. 11. Distribution characteristics of dislocations and precipitates in the TMAZ fabricated using different axial forces: (a, b, c) 15 kN, (d, e, f) 21 kN.
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