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The Effect of Pitting on Fatigue Lives of Peak-Aged and Overaged 7075 Aluminum Alloys

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Abstract

Fatigue lives at high peak stresses for peak-aged (T6) and overaged (T73) 7075 aluminum alloy were compared in the uncorroded and precorroded (pitted) states. Absolute fatigue lives of T73 samples were much higher than that of T6 in the virgin as well as precorroded condition, but the normalized life of T73 was less than that of T6, indicating an intrinsic crack initiation resistance in the former, borne out by fractography, which showed that fatigue cracks almost always initiated at pits for T73 but not for T6. The various crack initiation methodologies observed and the effect of pitting on fatigue lives in the two aging conditions are discussed.

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Acknowledgments

The authors thank Drs. S. Tarafder and S. Sivaprasad, National Metallurgical Laboratory, for helpful discussions and advice. One of the authors (SD) is grateful to the Council of Scientific and Industrial Research (CSIR), India, for a research fellowship.

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Authors and Affiliations

  1. National Metallurgical Laboratory (CSIR), Jamshedpur, 831007, India

    S. Dey (CSIR-Senior Research Fellow), S. K. Das (Scientist) & I. Chattoraj (Scientist and Head, Business Development & Monitoring Division)

  2. Department of Metallurgy and Materials Engineering, Bengal Engineering & Science University, Shibpur, Howrah, 711103, India

    A. Basumallick (Professor and Head)

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  1. S. Dey
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  2. S. K. Das
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  3. A. Basumallick
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  4. I. Chattoraj
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Correspondence to I. Chattoraj.

Additional information

Manuscript submitted August 18, 2009.

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Dey, S., Das, S.K., Basumallick, A. et al. The Effect of Pitting on Fatigue Lives of Peak-Aged and Overaged 7075 Aluminum Alloys. Metall Mater Trans A 41, 3297–3307 (2010). https://doi.org/10.1007/s11661-010-0395-z

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