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Effects of TAHA treatments on the fatigue life of a 7075 aluminium alloy

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Abstract

The effects of TAHA treatments including pre-ageing, plastic deformation and final-ageing on the fatigue life of a 7075 Al-Zn-Mg alloy were investigated. Pre-ageing was carried out at 100° C (TAHA1) and room temperature (TAHA2). Experimental results indicated that the improvement in fatigue life due to TAHA1 and TAHA2 was at least 19.5 and 26%, respectively, when compared to the conventional T-6 treatment. Scanning electron microscopy showed that fracture features such as dimple distribution, fatigue striation, tearing ridge and platelets could be correlated with fatigue behaviour. The correlation between the peak fatigue life, peak elongation, residual stress and substructure, such as subcell and precipitate, is also discussed.

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Author notes

  1. M. T. Jahn

    Present address: Department of Materials Science and Engineering, Tsinghua University, Hsinchu, Taiwan

Authors and Affiliations

  1. Department of Mechanical Engineering, California State University, Long Beach, California, USA

    M. T. Jahn & Max B. G. Jen

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  1. M. T. Jahn
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  2. Max B. G. Jen
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Jahn, M.T., Jen, M.B.G. Effects of TAHA treatments on the fatigue life of a 7075 aluminium alloy. J Mater Sci 21, 799–802 (1986). https://doi.org/10.1007/BF01117357

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  • DOI: https://doi.org/10.1007/BF01117357

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