Published: Jan 2005
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DEALLOYING HAS BEEN KNOWN for many years, in many alloy systems, under many different conditions. A number of mechanisms have been proposed and examined over time. Six specific mechanisms are reviewed here with information regarding systems wherein they have been observed, temperature regime, solutions, microstructural features, and the evidence that was cited for their origination. The literature regarding these mechanistic models is outlined along with possible problems not addressed by each model. Methods used for examination of dealloying are mentioned along with evaluation methods for considering the results of the examination. Although few standards exist dealing with dealloying, the lack of standards is discussed along with the few standards in existence. Test methods such as those used in examining stress corrosion cracking (SCC), which may be influenced by dealloying, are outlined and the effect of dealloying on these test methods is discussed.
Van Orden, AC
Old Dominion University, Norfolk, VA