Mechanical Alloying and Effect of Aging and Further Heating on the Properties of Cu–Ag, Cu–C Powders

Abstract

Compacting and mechanical alloying of Cu_1–x–Ag_x (x = 0.1; 0.2; ...; 0.9) and Cu_1–x–C_x (x = 0.05; 0.10; 0.15; 0.50) powders by severe plastic deformation under pressure are investigated. The formation of strongly non-equilibrium nanocrystalline solid solutions of Cu–Ag system partially decomposing at room temperature and on heating is revealed. Dependence of lattice parameter on concentration reveals positive deviation from Vegard law. Hardness of solutions exceeds the hardness of each pure component by 7.0–7.5 times. Mechanical alloying of Cu_1–x–С_x (x = 0,05; 0,10; 0,20; 0,50) system from copper and graphite powders non-equilibrium solution composites were obtained that decomposed after 1.5–2.0 months of aging at room temperature or on heating into regions enriched with copper or amorphous carbon (soot).