Hou, Wentao and Hu, Yongsheng and Qiang, Fei and Shen, Zhikang and Chen, Jianbin and Li, Junping and Huda, Nazmul and Luqman Hakim, Ahmad Shah and Shen, Yifu (2025) Strength-ductility synergy in dissimilar friction stir welded Al-Cu joints via introducing pin eccentricity. Materials Today Communications, 44 (111949). pp. 1-10. ISSN 2352-4928. (Published)
![[img]](http://umpir.ump.edu.my/style/images/fileicons/other.png) |
Pdf
Strength-ductility synergy in dissimilar friction stir welded Al-Cu.pdf Restricted to Repository staff only Download (8MB) | Request a copy |
Abstract
In dissimilar friction stir welding (FSW) joints, the stir zone, where brittle IMCs are extensively distributed, is usually the origin of crack initiation, which can severely deteriorate the joint performance. To improve the mechanical properties of Al-Cu friction stir weld joints by optimizing the stir zone microstructure and the distribution of IMCs particles, an eccentric welding tool was adopted to perform dissimilar friction stir welding of Al alloy to commercially pure Cu. Microstructure evolution of the stir zone was investigated by varying the value of pin eccentricity ranging from 0 to 0.4 mm using scanning electron microscopy (SEM), X-ray spectroscopy (EDS), optical microscopy (OM) and transmission electron microscopy (TEM). Mechanical properties, including ultimate tensile strength and elongation, of the samples produced with different eccentricity were evaluated by means of quasi-static uniaxial tensile test. The results indicate that with the application of pin eccentricity, a strength-ductility synergy was achieved, where the joint ultimate tensile strength (UTS) increased by 32 % to ~198 MPa with 0.4 mm eccentricity from ~150 MPa without pin eccentricity, and the corresponding elongation of the Al-Cu joints was also significantly increased, reaching up to 10.3 %. The enhanced strength-ductility synergy observed in the joints can be attributed to the significant refinement and more uniform distribution of Cu and intermetallic compound (IMC) particles within the stir zone, facilitated by the intensified straining effect of the eccentric pin. This study presents a novel approach for the fabrication of Al-Cu dissimilar joints that achieves superior strength while maintaining satisfactory ductility, thereby offering a balanced solution for the improvement of joint performance.
| Item Type: | Article |
|---|---|
| Additional Information: | Indexed by Scopus |
| Uncontrolled Keywords: | Aluminium; Copper; Dissimilar friction stir welding; Pin eccentricity; Stir zone; Strength-ductility synergy |
| Subjects: | T Technology > TA Engineering (General). Civil engineering (General) T Technology > TJ Mechanical engineering and machinery T Technology > TN Mining engineering. Metallurgy |
| Faculty/Division: | Faculty of Mechanical and Automotive Engineering Technology |
| Depositing User: | Mrs. Nurul Hamira Abd Razak |
| Date Deposited: | 17 Apr 2025 00:47 |
| Last Modified: | 17 Apr 2025 00:47 |
| URI: | http://umpir.ump.edu.my/id/eprint/44311 |
| Download Statistic: | View Download Statistics |
Actions (login required)
 |
View Item |