Influence of CO2 laser welding parameters on the microstructure, metallurgy, and mechanical properties of Mg-Al alloys
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- 作者：Chun-ming Lin (1)
Hsien-lung Tsai (1)
Chang-lin Lee (1)
Di-shiang Chou (2)
Sun-fen Lee (3)
Jen-ching Huang (4)
Jyun-wei Huang (1) - 关键词：magnesium alloys ; laser welding ; microstructure ; mechanical properties ; morphology
- 刊名：International Journal of Minerals, Metallurgy, and Materials
- 出版年：2012
- 出版时间：December 2012
- 年：2012
- 卷：19
- 期：12
- 页码：1114-1120
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Hsien-lung Tsai (1)
Chang-lin Lee (1)
Di-shiang Chou (2)
Sun-fen Lee (3)
Jen-ching Huang (4)
Jyun-wei Huang (1)
1. Department of Mechanical Engineering, College of Engineering, Taiwan University of Science and Technology, Taipei, 10673, China Taipei
2. Graduate Institute of Engineering, Taiwan University of Science and Technology, Taipei, 10673, China Taipei
3. Opto-Electronic Equipment Department, Metal Industries Research & Development Centre, Kaohsiung, 811, China Taipei
4. Department of Mechanical Engineering, Tungnan University, Shenkeng, 22202, China Taipei - ISSN：1869-103X
文摘
This study investigated the microstructural characteristics, metallurgy, microhardness, and tensile strength of AZ31 and AZ61 magnesium alloy weldments, fabricated in a CO2 laser welding process with the adjustment of various parameters. The results show that the AZ31 weldment contains equiaxed grains within the fusion zone (FZ). By contrast, the FZ of the AZ61 weldment contains refined cellular grains and the partially melted zone (PMZ) contains bulk grains. We infer that the difference in aluminum content between the two magnesium alloys results in different supercooling rates and solid grain structures. For both weldments, the ultimate tensile strength (UTS) decreases following the CO2 laser welding process. However, no significant difference is noted between the UTS of the two weldments, suggesting that tensile strength is insensitive to the Al content of the magnesium alloy. The CO2 laser welding process is shown to increase the microhardness of both magnesium alloys. Furthermore, grain refinement is responsible for the maximum hardness in the FZ of both weldments. The AZ61 weldment has a higher content of Al, resulting in a greater grain refinement.