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The effect of loading mode on the stress-corrosion cracking of aluminum alloy 5083

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Abstract

Recent studies have revealed that the mechanism of stress-corrosion cracking (SCC) of high-strength Al-Zn-Mg alloys involves both dissolution and hydrogen embrittlement (HE); moreover, under tensile-loading conditions, evidence exists that the hydrogen mechanism is dominant. In the present study, the role of HE in the SCC of Al-Mg alloys was investigated using commercial Al-4.4 wt pct Mg alloy, 5083. The susceptibility of this alloy to SCC in a saline environment was evaluated in Mode I (tension) and Mode III (torsion), using precracked fracture toughness specimens. The greater susceptibility found in Mode I indicates that HE is involved in SCC. As further evidence that HE is operating, susceptibility increased when As, a hydrogen recombination inhibitor, was added to the test solution under Mode I conditions. Issues related to the overall validity of the loading mode experiment are also addressed.

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Authors and Affiliations

  1. Martin Marietta Laboratories, 1450 South Rolling Road, 21227, Baltimore, MD

    J. R. Pickens (Senior Scientist), J. R. Gordon (Research Assistant) & J. A. S. Green (Associate Director)

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  1. J. R. Pickens
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  2. J. R. Gordon
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  3. J. A. S. Green
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Pickens, J.R., Gordon, J.R. & Green, J.A.S. The effect of loading mode on the stress-corrosion cracking of aluminum alloy 5083. Metall Trans A 14, 925–930 (1983). https://doi.org/10.1007/BF02644298

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