Effects of Intermediate Annealing on Properties of Deformation Processed Cu-15Cr-0.1Zr in Situ Composites

The structure,strength and electrical conductivity of deformation processed Cu-15Cr-0.2Zr in situ composites obtained by cold drawing combined with intermediate annealing were studied.The results showed that the as cast Cr phase was dendrite.Cr phase was drawn into fine ribbons during the drawing process and the Cr ribbons were curl and fold in cross section.The electrical conductivity can be obviously improved by appropriately intermediate annealing.Combination of cold drawing with appropriate intermediate annealing might result in good combinations of the tensile strength and electrical conductivity.The preferable combination of the electrical conductivity and the tensile strength of deformation processed Cu-15Cr-0.1Zr in situ composites were obtained by 450 ℃+400 ℃ and 500 ℃+500 ℃ intermediate annealing technics as follows:1 227 MPa/64.8%IACS and 1 025 MPa/71.5%IACS.