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Threshold for fatigue macrocrack propagation in some aluminum alloys

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Abstract

Measurement of the threshold for fatigue macrocrack propagation, ΔKo, in a number of aluminum alloys has shown an increase with grain size and decrease with increase in strength as with steels. The results are not primarily due to environmental enhancement of fatigue crack growth because an even larger variation in ΔKo with microstructural change is noted at 77 K than at 300 K. In particular, ΔKo of high purity 2124-T4 increases much more on cooling from 300 to 77 K than does ΔKo of 2024-T4. It is suggested that ΔKo is determined by the stress necessary to operate a dislocation source near the crack tip. A Frank-Read type source is proposed for 2024-T4 with constituent particles acting as pinning points while double cross-slip, a thermally activated process, is proposed for the source in high purity 2124-T4.

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Authors and Affiliations

  1. Science and Technology Division, International Harvester Company, 60521, Hinsdale, IL

    J. McKittrick (Research Associate)

  2. Research & Development Center, Westinghouse Electric Corporation, 15235, Pittsburgh, PA

    P. K. Liaw (Senior Engineer)

  3. Department of Metallurgical Engineering, Korea University, Seoul, Korea

    S. I. Kwun (Associate Professor)

  4. Materials Science and Engineering, Northwestern University, 60201, Evanston, IL

    M. E. Fine (Professor)

Authors
  1. J. McKittrick
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  2. P. K. Liaw
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  3. S. I. Kwun
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  4. M. E. Fine
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McKittrick, J., Liaw, P.K., Kwun, S.I. et al. Threshold for fatigue macrocrack propagation in some aluminum alloys. Metall Trans A 12, 1535–1539 (1981). https://doi.org/10.1007/BF02643701

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  • DOI: https://doi.org/10.1007/BF02643701

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