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Friction Stir Welding of Al Alloy 2219-T8: Part I-Evolution of Precipitates and Formation of Abnormal Al2Cu Agglomerates

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Abstract

Friction stir welding was performed on AA2219-T8 plates with 6.31 wt pct Cu. The thermal cycles were measured in different regions of the joint during welding. Differential scanning calorimetry and transmission electron microscopy were utilized to analyze the evolution of precipitates in the joint. The relationships between welding peak temperature, precipitate evolution, and microhardness distribution are discussed. The temperature in the heat-affected zone (HAZ) ranged from 453 K to 653 K (180 °C to 380 °C). The θ″ and some θ′ phases redissolved into the HAZ matrix, while the rest of the θ′ phases coarsened. In the thermomechanically affected zone (TMAZ), the temperature range was from 653 K to 673 K (380 °C to 400 °C), causing both θ″ phase and θ′ phase to redissolve. In the weld nugget zone (WNZ), all the θ″, θ′, and some of the θ phase (Al2Cu) redissolved. Abnormal θ particles were observed in the WNZ, including agglomerated θ with sizes around 100 to 1000 µm and a ring-shaped distribution of normal size θ particles. The formation of abnormal θ particles resulted from metal plastic flow during welding and the high content of Cu in AA2219. No abnormal θ particles were observed in joints of another AA2219 plate, which had a lower Cu content of 5.83 wt pct.

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Authors and Affiliations

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

    Ju Kang & Ai-Ping Wu

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

    Ju Kang, Zhi-Cao Feng, G. S. Frankel & I. Wen Huang

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

    Ju Kang

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

    Ai-Ping Wu

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

    Guo-Qing Wang

Authors
  1. Ju Kang
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  2. Zhi-Cao Feng
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  3. G. S. Frankel
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  4. I. Wen Huang
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  5. Guo-Qing Wang
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Correspondence to Ju Kang.

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Manuscript submitted March 3, 2016.

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Kang, J., Feng, ZC., Frankel, G.S. et al. Friction Stir Welding of Al Alloy 2219-T8: Part I-Evolution of Precipitates and Formation of Abnormal Al2Cu Agglomerates. Metall Mater Trans A 47, 4553–4565 (2016). https://doi.org/10.1007/s11661-016-3648-7

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  • DOI: https://doi.org/10.1007/s11661-016-3648-7

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