Abstract
A detailed study of rapid stress-corrosion-cracking (SCC) in a 7075 aluminum alloy has allowed separation of the mechanical and chemical contributions. This was accomplished by combining scanning electron microscopy, stress-wave emission and crack growth rate observations as a function of test temperature. These established an activation energy of 11.2 kcal/mol, a stress-intensity squared dependence of crack growth, and a range of 20 to 80 pct dimpled rupture on the fracture surfaces. Thus a two-step crack growth mechanism is proposed combining a thermally activated electrochemical process and a discontinuous mechanical jumping process.
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Formerly with the Lawrence Radiation Laboratory, Berkeley
Formerly with the Lawrence Radiation Laboratory, Berkeley
This research was performed at the Inorganic Materials Research Division, Lawrence Berkeley Laboratory, and Department of Materials Science and Engineering, College of Engineering, University of California, Berkeley, California 94720.
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Wood, W.E., Gerberich, W.W. The mechanical nature of stress-corrosion cracking in Al-Zn-Mg alloys: I. Evaluation of the ductile rupture contribution. Metall Trans 5, 1285–1294 (1974). https://doi.org/10.1007/BF02646611
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DOI: https://doi.org/10.1007/BF02646611