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Free dealloying of Cu-Hf-Al metallic glasses in HCl electrolytes are studied in this paper. The results show that the electrolyte concentration and dealloying time strongly influence the type of dealloying products. A superficial dealloying happens in diluted HCl electrolytes while a complete dealloying occurs in concentrated HCl electrolytes. The results present that Cu 2 O microparticles with regular morphology can be tailored on glassy surfaces in 0.05 M HCl solution by controlling the dealloying time. Furthermore, the designable products of nanoporous Cu, Cu 2 O nanoplates and CuO microwires can be fabricated in 1.2 M HCl electrolyte with the dealloying time. Due to a big difference of examined Cu-Hf-Al alloys in the electrolyte concentration and dealloying time, one or mixed dealloying products (Cu, Cu 2 O and CuO), which depend on the progress of relative chemical reactions and the different dealloying route, will finally be produced.

Tailored Dealloying Products of Cu-based Metallic Glasses in Hydrochloric Acid Solutions