Structures and properties of deformation-processed Cu-16Fe-2Cr in-situ composites

摘要

Microstructure and properties of deformation-processed Cu-16Fe-2Cr and Cu-18Fe in-situ composite wires obtained by cold drawing combined with intermediate annealing were investigated. At lower strains(η<2.52), most of the Fe(Cr) phases were elongated into filaments except some remain granular because of their higher hardness. The ultimate tensile strengths of Cu-16Fe-2Cr and Cu-18Fe are approximately equal at the same drawing strains, suggesting the increase of strength of Cu-16Fe-2Cr due to higher strength of Fe(Cr) filaments than that of Fe filaments which is counteracted by the somewhat coarse Fe(Cr) filaments in Cu-16Fe-2Cr at the same drawing strains. The increase of the electrical conductivity of Cu-16Fe-2Cr and Cu-18Fe after intermediate annealing is attributed to the precipitation of Fe, Cr atoms, which dissolved during melting processing. Electrical conductivity of the Cu-16Fe-2Cr in-situ composites is higher than Cu-18Fe in-situ composites at the same drawing strains. The addition of Cr to Cu-Fe system can increase mechanical stability of the filaments in the composites.