Microstructure of Self-Reacting Friction Stir Welded Joint of ZK60 Magnesium Alloy at Different Welding Speeds

HOU Juncai; BIAN Jingru; XU Wenjing; ZHANG Qiumei; ZHANG Hui

doi:10.11973/jxgccl201902012

Materials and Mechanical Engineering > 2019 > 43(2): 58-62,68. > DOI: 10.11973/jxgccl201902012

HOU Juncai, BIAN Jingru, XU Wenjing, ZHANG Qiumei, ZHANG Hui. Microstructure of Self-Reacting Friction Stir Welded Joint of ZK60 Magnesium Alloy at Different Welding Speeds[J]. Materials and Mechanical Engineering, 2019, 43(2): 58-62,68. DOI: 10.11973/jxgccl201902012

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Microstructure of Self-Reacting Friction Stir Welded Joint of ZK60 Magnesium Alloy at Different Welding Speeds

School of Materials Science and Technology, Shaanxi University of Science and Technology, Hanzhong 723001, China

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Received Date: August 31, 2018
Revised Date: December 24, 2018

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Abstract

Abstract

Self-reacting friction stir welding was conducted on 3 mm thick ZK60 magnesium alloy at different welding speeds (100-400 mm·min^-1), and then the microstructure of the joint was studied. The results show that the weld nugget zone of the joint had a dumbbell-shaped cross section. Flow patterns were observed near upper surface of the weld nugget zone on retreating side at the 1/4 radius of the shoulder. The advancing-side thermal mechanical affected zone was comprised of a banded structure stretching to the weld nugget zone. At different welding speeds, the interface between the advancing-side thermal mechanical affected zone and the weld nugget zone was obvious. The materials in the advancing-side thermal mechanical affected zone were deformed plastically, and the dynamic recrystallization occurred partially. The advancing-side weld nugget zone had a dynamic recrystallization at different welding speeds, and consisted of fine equiaxed dynamic recrystallization grains at 300 mm·min^-1 and 400 mm·min^-1; the flow pattern in one direction disappeared.
- magnesium alloy,
- microstructure,
- dynamic recrystallization,
- friction stir welding,
- plastic flow

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References

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Microstructure of Self-Reacting Friction Stir Welded Joint of ZK60 Magnesium Alloy at Different Welding Speeds

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