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Fractography of fatigue crack propagation in 2024-T3 and 7075-16 aluminum alloys in air and vacuum

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Abstract

Electron fractography and transmission electron microscopy were used to study fatigue crack propagation processes in 2024-T3 and 7075-T6 aluminum alloys in vacuum and air. There was evidence that crack growth occurs cycle-by-cycle in vacuum, but only for fa tigue in air was it possible to relate dislocation substructure band spacings, immediately below the fracture surface, to cyclic crack growth. A discussion of crack propagation mechanisms suggested that the Tomkins and Biggs model of striation formation comes closest to explaining the fractographic features.

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Authors and Affiliations

  1. Structures and MaterialsDepartment, National Aerospace Laboratory NLR, The Netherlands

    R. J. H. Wanhill (Research Scientist)

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  1. R. J. H. Wanhill
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Wanhill, R.J.H. Fractography of fatigue crack propagation in 2024-T3 and 7075-16 aluminum alloys in air and vacuum. Metall Trans A 6, 1587 (1975). https://doi.org/10.1007/BF02641972

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  • DOI: https://doi.org/10.1007/BF02641972

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