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Fatigue behavior and failure mechanisms of modified 7075 aluminum alloys

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Abstract

The effects of purity level and dispersoid type on the fatigue behavior of 7000 series alloys were investigated. Ten different compositions based on the 7075 alloy were produced with five levels of Fe + Si and either Cr or Zr dispersoids. Notched axial fatigue specimens were tested at room temperature and the fatigue life did not correlate with either purity level or dispersoid type. Specimens failed by three macroscopic modes designated as: slant, vee, or flat fracture. Sectioning analysis showed that the slant, vee, and flat fractures resulted from single, double and multiple initiation, respectively. Both initiation and propagation in all three modes of failures were dominated by slip related fracture on the {111} planes inclined at 35 deg to the tensile axis of the textured material. The same failure mechanisms were observed in smooth fatigue specimens.

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Authors and Affiliations

  1. Inland Steel Corporation Research Laboratory, 46312, East Chicago, IN, UA

    J. S. Santner

  2. Department of Materials Science and Metallurgical Engineering, University of Cincinnati, 45221, Cincinnati, OH

    D. Eylon

Authors
  1. J. S. Santner
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  2. D. Eylon
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formerly with the Metals and Ceramics Division, Air Force Materials Laboratory, Wright-Patterson Air Force Base, OH 45433

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Santner, J.S., Eylon, D. Fatigue behavior and failure mechanisms of modified 7075 aluminum alloys. Metall Trans A 10, 841–848 (1979). https://doi.org/10.1007/BF02658302

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