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Strengthening of Aluminum Alloy 2219 by Thermo-mechanical Treatment

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Abstract

Strengthening of aluminum alloy 2219 by thermo-mechanical treatment has been compared with artificial aging. Three simple deformation modes including pre-stretching, compression, and rolling have been used in thermo-mechanical treatment. The tensile strength, elongation, fracture feature, and precipitated phase have been investigated. The results show that the strengthening effect of thermo-mechanical treatment is better than the one of artificial aging. Especially, the yield strength significantly increases with a small decrease of elongation. When the specimen is pre-stretched to 8.0%, the yield strength reaches 385.0 MPa and increases by 22.2% in comparison to the one obtained in aging condition. The maximum tensile strength of 472.4 MPa is achieved with 4.0% thickness reduction by compression. The fracture morphology reveals locally ductile and brittle failure mechanism, while the coarse second-phase particles distribute on the fracture surface. The intermediate phases θ″ or θ′ orthogonally precipitate in the matrix after thermo-mechanical treatment. As compared to artificial aging, the cold plastic deformation increases distribution homogeneity and the volume fraction of θ′′ or θ′ precipitates. These result in a better strengthening effect.

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Authors and Affiliations

  1. Department of Plasticity Technology, Shanghai Jiao Tong University, Shanghai, 200030, People’s Republic of China

    Xifeng Li & Jun Chen

  2. Institute of Aerospace Special Material and Technology, Beijing, 100074, People’s Republic of China

    Kun Lei, Peng Song & Xinqin Liu

  3. AVIC Xi’an Aircraft Industry (Group) Company Ltd., Xi’an, 710089, People’s Republic of China

    Fei Zhang

  4. AVIC Chengdu Aircraft Industry (Group) Company Ltd., Chengdu, 610091, People’s Republic of China

    Jianfei Li

Authors
  1. Xifeng Li
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  2. Kun Lei
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  3. Peng Song
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  4. Xinqin Liu
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  5. Fei Zhang
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  6. Jianfei Li
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  7. Jun Chen
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Correspondence to Jun Chen.

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Li, X., Lei, K., Song, P. et al. Strengthening of Aluminum Alloy 2219 by Thermo-mechanical Treatment. J. of Materi Eng and Perform 24, 3905–3911 (2015). https://doi.org/10.1007/s11665-015-1665-0

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  • DOI: https://doi.org/10.1007/s11665-015-1665-0

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