J. Mater. Sci. Technol. ›› 2018, Vol. 34 ›› Issue (1): 185-191.DOI: 10.1016/j.jmst.2017.11.014
Special Issue: Aluminum Alloys-2018; FSW-and-FSP-articles 2018
• Orginal Article • Previous Articles Next Articles
Yunqiang Zhao*(), Chungui Wang, Jizhong Li, Jinhong Tan, Chunlin Dong
Received:
2017-03-28
Revised:
2017-06-20
Accepted:
2017-06-20
Online:
2018-01-20
Published:
2018-02-09
Contact:
Zhao Yunqiang
Yunqiang Zhao, Chungui Wang, Jizhong Li, Jinhong Tan, Chunlin Dong. Local melting mechanism and its effects on mechanical properties of friction spot welded joint for Al-Zn-Mg-Cu alloy[J]. J. Mater. Sci. Technol., 2018, 34(1): 185-191.
Zn | Mg | Cu | Mn | Fe | Cr | Si | Ni | Ti | Al |
---|---|---|---|---|---|---|---|---|---|
5.86 | 2.51 | 1.62 | 0.34 | 0.18 | 0.15 | 0.07 | 0.05 | 0.03 | Bal. |
Table 1 Chemical composition of 7B04-T74 aluminum alloy (wt%).
Zn | Mg | Cu | Mn | Fe | Cr | Si | Ni | Ti | Al |
---|---|---|---|---|---|---|---|---|---|
5.86 | 2.51 | 1.62 | 0.34 | 0.18 | 0.15 | 0.07 | 0.05 | 0.03 | Bal. |
Temperature (°C) | Thermal conductivity (N/sec °C) | Thermal capacity (N/mm2 °C) |
---|---|---|
20 | 155 | 2.38 |
100 | 186 | 2.54 |
200 | 197 | 2.66 |
300 | 194 | 2.7 |
400 | 196 | 2.83 |
500 | 196 | 2.97 |
532 | 193 | 2.99 |
628 | 85 | 2.83 |
700 | 84 | 2.8 |
Table 2 Thermal properties of 7B04-T74 aluminum alloy at different temperatures.
Temperature (°C) | Thermal conductivity (N/sec °C) | Thermal capacity (N/mm2 °C) |
---|---|---|
20 | 155 | 2.38 |
100 | 186 | 2.54 |
200 | 197 | 2.66 |
300 | 194 | 2.7 |
400 | 196 | 2.83 |
500 | 196 | 2.97 |
532 | 193 | 2.99 |
628 | 85 | 2.83 |
700 | 84 | 2.8 |
Yong’s modulus (GPa) | Poisson’s ration | Thermal expansion (°C-1) | Density (kg m-3) |
---|---|---|---|
68.9 | 0.3 | 2.2 × 10-5 | 2800 |
Table 3 Invariable thermal properties of 7B04-T74 aluminum alloy.
Yong’s modulus (GPa) | Poisson’s ration | Thermal expansion (°C-1) | Density (kg m-3) |
---|---|---|---|
68.9 | 0.3 | 2.2 × 10-5 | 2800 |
Fig. 3. Comparisons between experiment and simulation results of welding thermal cycles at different monitor positions at tool rotation speeds of (a) 1250 and (b) 2500 rpm.
Fig. 4. Simulation results of (a) instantaneous maximum temperatures as a function of welding time obtained at different tool rotation speeds and (b) temperature distribution on a half weld at the welding time of 3.5 s.
Fig. 5. Distributions of material flow velocity on the cross-section of a half weld at the welding time of (a) 1.7 s and (b) 3.7 s at the tool rotation speed of 2500 rpm.
Fig. 8. SEM images of “U” line in regions (a) A, (c) B, (d) C, (e) D as marked in Fig. 7b and (b) the energy dispersive spectrum result at the marked point.
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