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Friction Stir Welding of Al Alloy 2219-T8: Part II-Mechanical and Corrosion

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Abstract

In Part I of this series, abnormal agglomerations of θ particles with size of about 100 to 1000 µm were observed in friction stir welded AA2219-T8 joints. In this work, the effects of these agglomerated θ particles on the mechanical and corrosion properties of the joints are studied. Tensile testing with in situ SEM imaging was utilized to monitor crack initiation and propagation in base metal and weld nugget zone (WNZ) samples. These tests showed that cracks initiated in the θ particles and at the θ/matrix interfaces, but not in the matrix. The WNZ samples containing abnormal agglomerated θ particles had a similar ultimate tensile stress but 3 pct less elongation than other WNZ samples with only normal θ particles. Measurements using the microcell technique indicated that the agglomerated θ particles acted as a cathode causing the dissolution of adjacent matrix. The abnormal θ particle agglomerations led to more severe localized attack due to the large cathode/anode ratio. Al preferential dissolution occurred in the abnormal θ particle agglomerations, which was different from the corrosion behavior of normal size θ particles.

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Author information

Authors and Affiliations

  1. Department of Mechanical Engineering, Tsinghua University, Beijing, 100084, China

    Ju Kang (Ph.D student) & Ai-Ping Wu (Professor)

  2. Fontana Corrosion Center, The Ohio State University, Columbus, OH, 43210-1185, USA

    Ju Kang (Ph.D student), Zhi-Cao Feng (Ph.D student), Ji-Chao Li (Ph.D student) & G. S. Frankel (Professor)

  3. North China Electric Power Research Institute Co. Ltd., Beijing, 100045, China

    Ju Kang (Ph.D student)

  4. State Key Laboratory of Tribology, Tsinghua University, Beijing, 100084, China

    Ai-Ping Wu (Professor)

  5. China Academy of Launch Vehicle Technology, Beijing, 100076, China

    Guo-Qing Wang (Professor)

Authors
  1. Ju Kang
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  2. Zhi-Cao Feng
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  3. Ji-Chao Li
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  4. G. S. Frankel
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  5. Guo-Qing Wang
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  6. Ai-Ping Wu
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Correspondence to Ju Kang.

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Manuscript submitted March 13, 2016.

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Kang, J., Feng, ZC., Li, JC. et al. Friction Stir Welding of Al Alloy 2219-T8: Part II-Mechanical and Corrosion. Metall Mater Trans A 47, 4566–4577 (2016). https://doi.org/10.1007/s11661-016-3646-9

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  • DOI: https://doi.org/10.1007/s11661-016-3646-9

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