期刊
出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2022.142754
关键词
Stationary shoulder friction stir welding; Dissimilar materials; Microstructures; Mechanical properties
类别
资金
- National Natural Science Foundation of China [51905112]
- Guangzhou Foreign Science and Technology Cooperation Program Project [201807010068]
- Science and Technology Plan Project of Guangzhou City [201807010063]
- National Key Research and Development Program of China [2020YFE0205300]
This study found that by applying stationary shoulder friction stir welding (SSFSW) method, material mixing and growth of intermetallic compounds (IMCs) in Al-Cu joints can be effectively suppressed, leading to improved mechanical properties. Compared with conventional friction stir welding (CFSW), SSFSW resulted in refined grain structure and enhanced plastic deformation in the heat affected zone (HZ), thereby significantly improving the tensile strength of the joints.
The fundamental reasons for the poor mechanical properties of the Al-Cu conventional friction stir welding (CFSW) joints are serious material mixing and excessively thick intermetallic compounds (IMCs). In this study, stationary shoulder friction stir welding (SSFSW) was innovatively applied to join the Al-Cu dissimilar materials. The results indicated that the material mixing and the IMCs growth were successfully suppressed. Compared with the CFSW, the grains in the SZ of the SSFSW joint were refined and the plastic deformation in the SZ was enhanced. This was attributed to the frictional driving force of SSFSW was higher than that of CFSW. The mutual diffusion reaction of Al and Cu elements was inhibited owing to the lower heat input of the SSFSW. The mechanical properties of the joints were significantly improved by the SSFSW. The tensile strength of the optimal SSFSW joint was found to be 211.4 MPa which is 15.1% higher than that of the optimal CFSW joint. Moreover, the fracture occurred in the Al matrix. Reducing the stress concentration in the SZ caused by materials mixing was shown to be the main mechanism for SSFSW to improve the tensile performance of the joint.
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