Mechanisms and Morphology Evolution in Dealloying
Historically, dealloying, the selective dissolution of elemental components from an alloy, has been studied most intensively for binary noble-metal alloys such as Ag-Au, Cu-Au and Zn-Cu. There have been three primacy "mechanisms" proposed to explain ambient temperature dealloying in such systems: "simultaneous" dissolution of both components/redeposition of the more-noble constituent, lattice diffusion-supported by a di-vacancy mechanism of the more reactive component to the alloy/electrolyte interface and percolation dissolution. Here, we briefly discuss each of these mechanisms and the corresponding dealloyed morphology. In order to examine the connection between a mechanism and morphology we examined dealloying of Mg from Mg-Cd alloys under conditions for which vacancy-mediated lattice diffusion occurs at significant rates. Depending on alloy composition and dealloying rate, we observed either "negative" dendrites or bi-continuous structures, each of which is directly associated with the operation of a particular mechanism. Our findings should be useful to researchers employing dealloying to obtain particular types nanostructured features for a variety of applications. (C) 2013 The Electrochemical Society. All rights reserved.
- Sponsoring Organization:
- USDOE Advanced Research Projects Agency - Energy (ARPA-E)
- DOE Contract Number:
- DE-FOA-0000065
- OSTI ID:
- 1211495
- Journal Information:
- Journal of the Electrochemical Society, Vol. 160, Issue 6; ISSN 0013-4651
- Country of Publication:
- United States
- Language:
- English
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