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Mechanical Properties and Corrosion Behavior of Spray-Formed 7075 Alloy with One-Stage Aging

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Abstract

The mechanical properties, corrosion resistance and microstructure of the spray-formed 7075 alloy after one-stage aging treatments were studied by using a tensile tester, hardness tester, slow strain rate test, electrical test, intergranular corrosion test, electrochemical corrosion test, scanning electron microscope and transmission electron microscope. The results show that the strength and hardness of the alloy have double peaks with the one-stage aging treatments. With aging at 120 °C for 24 h (first peak), abundant tiny η′ phases and η phases precipitate in the matrix. The tensile strength of the alloy increases to 760 MPa, and the elongation is 4.8%. After aging at 120 °C for 132 h (second peak), blocky η phases appear. The tensile strength and elongation of the alloy are 757 MPa and 5.9%, respectively. The grain boundary precipitates dissociate, and the precipitate-free zones are widened. The corrosion resistance of the alloy increases.

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Acknowledgments

This research was financially supported by the National Natural Science Foundation of China (51574167), Research Fund for the Doctoral Program of Liaoning Province (20170520337), Program for Innovative Research Team in University of Liaoning Province (LT2015020) and Program for National Key Research and Development Plan (2017YFB1104000).

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Authors and Affiliations

  1. School of Materials Science and Engineering, Shenyang University of Technology, Shenyang, 110870, People’s Republic of China

    Ruiming Su, Tong Liu, Yingdong Qu, Guang Bai & Rongde Li

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  1. Ruiming Su
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Correspondence to Ruiming Su.

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Su, R., Liu, T., Qu, Y. et al. Mechanical Properties and Corrosion Behavior of Spray-Formed 7075 Alloy with One-Stage Aging. J. of Materi Eng and Perform 28, 2212–2220 (2019). https://doi.org/10.1007/s11665-019-03997-1

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