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Tensile and fatigue properties of a thermomechanically treated 7475 aluminium alloy

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Abstract

High-purity Al-Zn-Mg alloy was thermomechanically treated. The process included solution treatment, pre-ageing, cold-working by rolling and final ageing. Pre-ageing was carried out at 100°C (TAHA1) and room temperature (TAHA2). Experimental results indicated that the TAHA1 process improved the tensile strength significantly while the TAHA2 process improved the fatigue life more substantially. Fatigue crack initiation sites were examined carefully by scanning electron microscopy. A correlation between fatigue crack initiation, fatigue striation, tearing ridge, dimple distribution and fatigue life was observed. The experimental results are discussed in terms of substructure and are also compared with the tensile and fatigue properties of a thermomechanically treated 7075 Al-Zn-Mg alloy which were previously reported by one of the authors.

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Authors and Affiliations

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

    M. T. Jahn & Jin Luo

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  1. M. T. Jahn
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  2. Jin Luo
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Jahn, M.T., Luo, J. Tensile and fatigue properties of a thermomechanically treated 7475 aluminium alloy. J Mater Sci 23, 4115–4120 (1988). https://doi.org/10.1007/BF01106845

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  • DOI: https://doi.org/10.1007/BF01106845

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