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Influence of RRA Treatment on the Microstructure and Stress Corrosion Cracking Behavior of the Spray-Formed 7075 Alloy

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Materials Science Aims and scope

The effects of retrogression under pre-aging on the microstructure, mechanical properties, and stress corrosion cracking behavior of spray-formed 7075 aluminum alloys were investigated by the transmission electron microscopy, tensile tests, and slow strain rate tests. The results show that as a result of aging at 120°C for 16 h (as pre-aging), the strength of the alloy can be preserved on a high level and the grainboundary precipitates are discrete after retrogression and re-aging treatment. However, the retrogression treatment is uncontrollable by the shortened retrogression period. After retrogression at 200°C for 8 min and re-aging, the ultimate tensile strength, elongation, and the stress corrosion cracking index of the alloy are 791 MPa, 8.5% and 0.155, respectively.

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Acknowledgements

The present research was financially supported by the Program for Liaoning Innovative Research Team in University (LT2012004) and the Fok Ying-Tong Education Foundation (121054).

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Authors and Affiliations

  1. School of Material Science and Engineering, Shenyang University of Technology, Shenyang, China

    R.-M. Su, Y.-D. Qu, R.-D. Li & J.-H. You

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  1. R.-M. Su
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  2. Y.-D. Qu
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  3. R.-D. Li
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Correspondence to Y.-D. Qu.

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Published in Fizyko-Khimichna Mekhanika Materialiv, Vol. 51, No. 3, pp. 68–75, May–June, 2015.

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Su, RM., Qu, YD., Li, RD. et al. Influence of RRA Treatment on the Microstructure and Stress Corrosion Cracking Behavior of the Spray-Formed 7075 Alloy. Mater Sci 51, 372–380 (2015). https://doi.org/10.1007/s11003-015-9851-7

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  • DOI: https://doi.org/10.1007/s11003-015-9851-7

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