The Refinement of the Nanoporous Copper by Adding Third Elements

Zhen Hua Dan; Feng Xiang Qin; Nobuyoshi Hara

doi:10.4028/www.scientific.net/MSF.783-786.1986

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HomeMaterials Science ForumMaterials Science Forum Vols. 783-786The Refinement of the Nanoporous Copper by Adding...

The Refinement of the Nanoporous Copper by Adding Third Elements

Abstract:

Fine nanoporous copper was fabricated from the amorphous Ti-Cu alloys with a minor addition of silver in 10 mM HF solutions. The pore sizes decreased from 100 nm to 12 nm with the increase of the Ag contents in comparison of Ti₆₀Cu₄₀ ribbons free of Ag. With increasing of the dealloying time, the sizes of the nanopores and ligaments increased for the nanostrucutres on Ti₆₀Cu₃₈Ag₂ ribbons since the segregation of the Ag phase which triggered the galvanic dissolution of the adjacent Cu matrix in form of micro-couplings to further coarsen the nanoporous Cu. On the contrary, the trace formation of the Ag phase on the Ti₆₀Cu₃₉Ag₁ ribbons had a weak ability to motivate the galvanic dissolution, indicating by the constant pore sizes and slight decrease in the ligament sizes with the increase in the dealloying time. The refinement of the nanoporous structures was ascribed to the drastic decrease in the surface diffusivity. The decrease in the surface diffusivity due to the involvement of Ag with a lower surface diffusivity in comparison of Cu was more than one order of magnitude. The involvement of Ag adatoms restricted the diffusion of Cu adatoms in the interface regions in the inward and outward directions.

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Materials Science Forum (Volumes 783-786)

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1986-1989

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https://doi.org/10.4028/www.scientific.net/MSF.783-786.1986

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May 2014

Authors:

Zhen Hua Dan*, Feng Xiang Qin, Nobuyoshi Hara

Keywords:

Dealloying, Metallic Glass, Nanoporous Metals, Silver Addition, Surface Diffusion

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