| Title |
Microstructure and Friction-Stir Weldability of High-Strength Aluminum |
| Authors |
김현(Hyun Kim) ; 최효남(Hyo-Nam Choi) ; 신재혁(Jae-Hyuck Shin) ; 최정원(Jeong-Won Choi) ; 이승준(Seung-Joon Lee) |
| DOI |
https://doi.org/10.3365/KJMM.2026.64.10.867 |
| ISSN |
1738-8228(ISSN), 2288-8241(eISSN) |
| Keywords |
Friction-stir welding (FSW); AA7068; Dynamic recrystallization; Texture |
| Abstract |
In the present study, we aimed to analyze the microstructural characteristics and joint efficiency of an AA7068-T6 alloy after friction-stir welding (FSW) at welding speeds from 150 to 350 mm/min at a tool rotation speed of 600 rpm under an Ar gas atmosphere. In the stir zone during FSW, the peak temperature decreased, whereas both the effective strain rate and the Zener-Hollomon parameter increased with increasing welding speed. Continuous dynamic recrystallization occurred actively regardless of the welding speed, leading to fine, equiaxed grains. Regarding the texture evolution of the stir zone, the welds exhibited the development of a recrystallization texture (e.g., Goss). Consequently, the weld produced at 250 mm/min exhibited superior weldability, achieving a joint efficiency of ~80%. |