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Effect of Rotational Speed on Microstructure and Mechanical Properties in Submerged Friction Stir Welding of ME20M Magnesium Alloy

  • Wenming Liu
  • Yifu ShenEmail author
  • Chao Guo
  • Ruiyang Ni
  • Yinfei Yan
  • Wentao Hou
Article
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Abstract

Submerged friction stir welding of magnesium alloys has not been well investigated to date. ME20M is an important lightweight magnesium (Mg) alloy with enhanced yield strength and heat resistance that merits further research. In this paper, submerged friction stir welding of the ME20M Mg alloy was carried out using different parameters for the underwater cooling. Defect-free weld joints were produced, and the macrostructure, microstructure, tensile properties, and hardness were investigated. The results show that by increasing the rotational speed, the grain size of the weld nugget increased, the tensile strength of the joint decreased, and the microhardness of the different weld zones decreased. The finest obtained grain size was about 3.5 µm in the weld nugget at a rotational speed of 1100 rpm. The highest tensile strength achieved was 183.2 MPa, which was ~ 76.32% of the base metal. The highest and lowest hardness values of the weld joint were obtained at rotational speeds of 1100 and 1600 rpm, respectively, in the weld nugget and heat-affected zones.

Keywords

ME20M magnesium alloy mechanical properties microstructure rotational speed submerged friction stir welding 

Notes

Acknowledgments

The study work of this paper is supported by the National Natural Science Foundation of China (Grant No. 51475232). This is a project funded by the Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD).

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Copyright information

© ASM International 2019

Authors and Affiliations

  • Wenming Liu
    • 1
  • Yifu Shen
    • 1
    Email author
  • Chao Guo
    • 1
  • Ruiyang Ni
    • 1
  • Yinfei Yan
    • 1
  • Wentao Hou
    • 1
  1. 1.College of Materials Science and TechnologyNanjing University of Aeronautics and Astronautics (NUAA)NanjingPeople’s Republic of China

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