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Stress corrosion crack velocity and grain boundary precipitates in an Al-Zn-Mg alloy

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Abstract

The fracture kinetics of Al-5.5 Zn-2.5 Mg alloys submersed in 3 pct NaCl-H2O solutions were varied by heat treatment. The steady state velocity, on a plot of velocity vs stress intensity, was compared with microstructure and it was found to be inversely proportional to the volume of MgZn2 in the grain boundary. This behavior suggests that grain boundary precipitates can act as sacrificial anodes to retard intergranular stress corrosion cracking.

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Authors and Affiliations

  1. Department of Metallurgy and Institute of Materials Science, University of Connecticut, 06268, Storrs, Conn.

    P. K. Poulose & J. E. Morral

  2. George Washington University, Washington, D.C.

    A. J. McEvily

Authors
  1. P. K. Poulose
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  2. J. E. Morral
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  3. A. J. McEvily
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Formerly Graduate Student at the University of Connecticut

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Poulose, P.K., Morral, J.E. & McEvily, A.J. Stress corrosion crack velocity and grain boundary precipitates in an Al-Zn-Mg alloy. Metall Trans 5, 1393–1400 (1974). https://doi.org/10.1007/BF02646625

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