Abstract
Dealloying has evolved from a problematic corrosion process to a versatile tool for scalable fabrication of nanostructured metals. While the original, and majority of, work in the area has focused on electrochemical dealloying, a powerful variation of dealloying—liquid metal dealloying—has recently gained popularity. This process relies on a melt to carry out selective dissolution, replacing the traditional electrolyte solution. While electrolytes and molten metals are both suitable dealloying media, they can lead to very different morphologies. In this article, we compare and contrast what is known about the microscale physics and chemistry controlling microstructural evolution in electrochemical and liquid metal dealloying. We conclude that the core phenomenology of porosity evolution—a competition between dissolution and interface diffusion—is similar in both dealloying processes, but that the relative magnitudes of these two processes control interfacial pattern formation.
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Acknowledgements
J.E. acknowledges support from the National Science Foundation DMR Program under Grant DMR-1402726. A.K. acknowledges support from Grant DEFG02–07ER46400 from the US Department of Energy, Office of Basic Energy Sciences. We thank B. Gaskey for technical contributions to this work.
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McCue, I., Karma, A. & Erlebacher, J. Pattern formation during electrochemical and liquid metal dealloying. MRS Bulletin 43, 27–34 (2018). https://doi.org/10.1557/mrs.2017.301
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DOI: https://doi.org/10.1557/mrs.2017.301