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Mechanical properties and constitutive behaviors of as-cast 7050 aluminum alloy from room temperature to above the solidus temperature

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Abstract

The mechanical properties and constitutive behaviors of as-cast AA7050 in both the solid and semi-solid states were determined using the on-cooling and in situ solidification approaches, respectively. The results show that the strength in the solid state tends to increase with decreasing temperature. The strain rate plays an important role in the stress–strain behaviors at higher temperatures, whereas the influence becomes less pronounced and irregular when the temperature is less than 250°C. The experimental data were fitted to the extended Ludwik equation, which is suitable to describe the mechanical behavior of the materials in the as-cast state. In the semi-solid state, both the strength and ductility of the alloy are high near the solidus temperature and decrease drastically with decreasing solid fraction. As the solid fraction is less than 0.97, the maximum strength only slightly decreases, whereas the post-peak ductility begins to increase. The experimental data were fitted to the modified creep law, which is used to describe the mechanical behavior of semi-solid materials, to determine the equivalent parameter f GBWL, i.e., the fraction of grain boundaries covered by liquid phase.

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Authors and Affiliations

  1. State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing, 100083, China

    Qing-ling Bai, Hong-xiang Li, Ji-shan Zhang & Lin-zhong Zhuang

  2. SINTEF Materials and Chemistry, Trondheim, Norway

    Qiang Du

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  1. Qing-ling Bai
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  2. Hong-xiang Li
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  4. Ji-shan Zhang
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Correspondence to Hong-xiang Li or Lin-zhong Zhuang.

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Bai, Ql., Li, Hx., Du, Q. et al. Mechanical properties and constitutive behaviors of as-cast 7050 aluminum alloy from room temperature to above the solidus temperature. Int J Miner Metall Mater 23, 949–958 (2016). https://doi.org/10.1007/s12613-016-1311-3

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  • DOI: https://doi.org/10.1007/s12613-016-1311-3

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