The structure and phase composition of dispersion-strengthened composite materials of the system Cu-Ti-C-O
The results of studying the structure and phase composition of dispersion-strengthened composite materials of the Cu-Ti-C-O system obtained by the method of reactive mechanical alloying of powdered copper with titanium and carbon in the air of the attritor working chamber are presented. It is shown that the materials under study with an equiatomic ratio of the amount of introduced carbon and titanium have an inhomogeneous structure, consisting of light and dark areas that differ significantly in microhardness. The dark areas are less strengthened. With an increase in the content of the introduced titanium powder in relation to carbon, the dark areas disappear. On the basis of atomic force microscopy and measurement of the lattice parameter, it is shown that the copper matrix of the investigated composite materials in the form of a solid solution with a titanium content of no more than 0.2% Ti has a nanocrystalline structure. By X-ray phase analysis of the anodic deposit of the materials under study, it is found that the main strengthening phases are titanium carbide nanoparticles. In addition, the studied materials show traces of the presence of free titanium in the form of its -modification and the Cu3Ti intermetallic compound.