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Comparisons of Age Hardening and Precipitation Behavior in 7075 Alloy Under Single and Double-Stage Aging Treatments

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Abstract

Various sets of heat treatments are applied on 7075 alloy in this study in order to reduce the treatment time and yet still achieve the similar mechanical property as the traditional T6 tempered alloy. The main parameters like solid solution treatment time, single aging temperature, as well as first aging duration in double aging treatment, first aging temperature and second aging temperature are studied and valued by hardness test. The double aging treatment at 125 °C for 60 min and then at 165 °C for 130 min is compared with traditional single aging treatment by using advanced Cs-corrected high-angle annular dark field scanning-transmission electron microscopy (HAADF-STEM). The precipitates and dispersoids found in those two corresponding samples are mainly Cr-containing large dispersoids, a few η particles and large quantity of fine precipitates like η′. The similarity of precipitates in them can well support the approximate hardness level of the double aged and single aged samples.

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Authors and Affiliations

  1. School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai, 200240, China

    Yun Fan, Shaohan Wang & Bin Chen

  2. Department of Vehicle Engineering, NIO Co. Ltd, Shanghai, 201814, China

    Xuan Tang

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  1. Yun Fan
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  2. Xuan Tang
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  3. Shaohan Wang
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  4. Bin Chen
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Correspondence to Bin Chen.

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Fan, Y., Tang, X., Wang, S. et al. Comparisons of Age Hardening and Precipitation Behavior in 7075 Alloy Under Single and Double-Stage Aging Treatments. Met. Mater. Int. 27, 4204–4215 (2021). https://doi.org/10.1007/s12540-020-00875-7

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