Abstract
In-situ characterizations are of central importance to unveil dealloying mechanisms, but normal X-ray signals suffer from the interference from aqueous solutions. Herein, a special sample holder with flowing solutions was designed for in-situ X-ray diffraction (XRD) measurements, and a Cu90Au10 alloy was chosen as an example to investigate the dealloying mechanism using in-situ XRD. The results demonstrate that no intermediate phase appears during the dealloying of Cu90Au10, revealing a direct phase transformation from Cu(Au) solid solution to nanoporous Au. Moreover, the peak position of Au phase shows a non-monotonic shift, associated with complex strain states generated during dealloying.
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