Cu-Ag Solid Solutions Formation and Properties upon Severe Plastic Deformation

Abstract:

A number of nonequilibrium nanocrystalline fcc solid solutions Cu_1-x-Ag_x (x = 0,1; 0,2; ... 0,9; 1,0) were obtained by mechanical alloying of powders by the use of high pressure torsion. Chemical homogeneity, microstructure, mechanical properties and thermostability were studied. The obtained alloys were found to be characterized by a positive excess over Vegard law, ~ 20 nm grain sizes, a microhardeness of 4.5-6 times higher than the Cu and Ag one and brittle type of the fracture surface. In situ shear stress vs. strain measurements and energy-power parameters estimation were performed. A decomposition of nonequilibrium solid solution induced by a thermal influence begins from close to room temperatures and finishes completely at heating up to 500°С accompanied by collective recrystallization development.

• Periodical: Advanced Materials Research (Volume 1013)
• Pages: 211-217
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.1013.211
• Online since: October 2014
• Authors: V.P. Pilyugin*, Temofei Tolmachev, Irina Solodova, Olga Antonova, Alexey Ancharov, Eugeny Chernyshov, Alexander Patselov
• Keywords: Ag, Cu, Decomposition, Fractography, Homogeneity, Mechanical Alloying, Nonhomogeneous Solid Solution, Severe Plastic Deformation

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