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- Title
Effect of Welding Conditions on Microstructure and Mechanical Properties of Friction Stir Welded AZ31 Mg Alloy Joints.
- Authors
Zhang, Lin; Zhang, Zanyang; Huang, Lele; Wu, Lihong; Sun, Yufeng; Guan, Shaokang
- Abstract
Friction stir welded (FSWed) AZ31 Mg alloy joints were prepared at two different rotation speeds, namely, 150 rpm and 500 rpm, and are referred to as FSW-150 and FSW-500, respectively. The microstructure of the FSW joints was characterized and the local strain evolution in the tensile tests was monitored by a high-resolution digital image correlation method. The results show that the stir zone (SZ) of both FSW joints showed an equiaxed grain structure and the thermal-mechanically affected zone (TMAZ) had a gradually varied texture in FSW-150, compared with the relatively stable texture in FSW-500. A basin-shaped SZ was formed in FSW-150, while a cylindrical-shaped SZ was formed in FSW-500. Due to the different shape of SZ, the strain was gradually increased in TMAZ through the thickness of the FSW-500 specimen in tensile tests. However, the FSW-150 specimen showed an inhomogeneous strain distribution through the thickness, which resulted in the shear tensile stress to be localized at the TMAZ/SZ boundary and early fracture of the tensile specimen. Finally, the FSW-500 specimen showed an improved tensile strength and elongation of 250 MPa and 17%, compared with the 210 MPa and 6% for the FSW-150 counterpart.
- Subjects
FRICTION stir welding; DIGITAL image correlation; MICROSTRUCTURE; WELDING; TENSILE tests; ALUMINUM-lithium alloys
- Publication
JOM: The Journal of The Minerals, Metals & Materials Society (TMS), 2023, Vol 75, Issue 7, p2374
- ISSN
1047-4838
- Publication type
Article
- DOI
10.1007/s11837-023-05833-3