Investigation of Microstructures and Fatigue Properties of Friction Stir Welded Al-Mg Alloy
FS welds have a sound joint for the lack of voids, cracks and distortions. When compared to the base material, friction stir welding (FSW) joints exhibit a finer crystal grain in the weld nugget, and advancing side has a clearer boundary with the weld nugget than that of the retreating side. The fatigue life of FS welds is 6-14 times longer than that of MIG-pulse welds under the stress ratio R = 0.1 and the calculated fatigue characteristic values of each weld increase from 42.32 MPa for MIG to 68.47 MPa for FSW at 2 x 106 cycles. In the high-cycle regime, the fatigue strength of the FSW joint is almost equivalent to that of the base material. The fatigue fracture of FSW revealed regions of crack initiation, stable crack growth and overload.
C. Zhou et al., "Investigation of Microstructures and Fatigue Properties of Friction Stir Welded Al-Mg Alloy," Materials Chemistry and Physics, vol. 98, no. 2-3, pp. 285-290, Elsevier BV, Aug 2006.
The definitive version is available at http://dx.doi.org/10.1016/j.matchemphys.2005.09.019
Materials Science and Engineering
Keywords and Phrases
Al-Mg Alloy; Friction Stir Welding; MIG-Pulse Welding; Crack Propagation; Fatigue Of Materials; Fracture; Microstructure; Welding; Aluminum Alloys
International Standard Serial Number (ISSN)
Article - Journal
© 2006 Elsevier BV, All rights reserved.