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Effect of Ultrasonic Impact on the Microstructure of Welded Joint of 2195 Al–Li Alloy

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Acta Metallurgica Sinica (English Letters) Aims and scope

Abstract

It is known that an ultrasonic impact during tungsten inert gas welding can refine the grains and improve the mechanical properties of the welded joints of aluminum alloys. However, the influence mechanism of the ultrasonic impact on the microstructures is still unclear. In this research, the effects of the mechanical and ultrasonic impact on the microstructures of the welded joint of 2195 Al–Li alloy are analyzed. It is found that the mechanical impact could not refine the grains, but the ultrasonic impact could refine the grains. The grains become smaller in the weld center with an increase in the ultrasonic amplitude. Possible mechanisms for the grain refinement are discussed. The results show that the small temperature gradient promotes formation of the equiaxed grain and the cavitation promotes heterogeneous nucleation.

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Acknowledgments

This project was supported by the  Key Program of the National Natural Science Foundation of China (Grant No. 51435004).

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Authors and Affiliations

  1. State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, Harbin, 150001, PR China

    Qi-Hao Chen, San-Bao Lin, Chun-Li Yang & Cheng-Lei Fan

Authors
  1. Qi-Hao Chen
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  2. San-Bao Lin
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  3. Chun-Li Yang
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  4. Cheng-Lei Fan
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Corresponding author

Correspondence to Chun-Li Yang.

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Available online at http://link.springer.com/journal/40195

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Chen, QH., Lin, SB., Yang, CL. et al. Effect of Ultrasonic Impact on the Microstructure of Welded Joint of 2195 Al–Li Alloy. Acta Metall. Sin. (Engl. Lett.) 29, 367–372 (2016). https://doi.org/10.1007/s40195-016-0396-z

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  • DOI: https://doi.org/10.1007/s40195-016-0396-z

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