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Friction Stir Lap Welding of Mg/Ti Dissimilar Alloys Using a Slight Penetration Depth

  • Aluminum and Magnesium: New Alloys and Applications
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Abstract

Friction stir lap welding was applied to join AZ31B Mg alloy and Ti-6Al-4V alloy using a slight penetration depth. The microstructure and tensile properties of the joints formed using different rotating speeds were investigated. The results showed that a dispersion layer comprising Ti fragments with size of less than 15 μm formed in the stir zone near the lap interface. A wave-like pattern formed on the surface of the bottom Ti alloy, leading to micromechanical interlocking. A 2.1-μm-thick Al enrichment layer formed at the lap interface when using the rotating speed of 1400 rpm, resulting in metallurgical bonding. The joints fractured at the lap interface, and the local region of the fracture surface on the Ti alloy side was covered with Mg alloy. The tensile shear strength of the joints increased with increase of the rotating speed, and the maximum tensile shear load reached 9765 N for the joint prepared at 1400 rpm.

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Acknowledgements

This project was supported by the National Natural Science Foundation of China (No. 51705339).

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Author notes

  1. Wei Hu and Shude Ji contributed equally to this work.

Authors and Affiliations

  1. College of Aerospace Engineering, Shenyang Aerospace University, Shenyang, 110136, People’s Republic of China

    Shude Ji, Wei Hu, Qinghua Li & Xue Gong

  2. State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, Harbin, 150001, People’s Republic of China

    Zhongwei Ma

Authors
  1. Shude Ji
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  2. Wei Hu
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  3. Zhongwei Ma
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  4. Qinghua Li
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  5. Xue Gong
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Correspondence to Shude Ji or Zhongwei Ma.

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Ji, S., Hu, W., Ma, Z. et al. Friction Stir Lap Welding of Mg/Ti Dissimilar Alloys Using a Slight Penetration Depth. JOM 72, 1589–1596 (2020). https://doi.org/10.1007/s11837-019-03959-x

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  • DOI: https://doi.org/10.1007/s11837-019-03959-x

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