Investigating the process of hot extrusion of powder copper-based disperse-hardening and strengthening composite materials

It is shown, that powder composite materials used for contact welding electrodes should be based on copper hot extrusion. In that case, the matrix strengthening should be carried out by heat treatment by hardening with disperse particles and strengthening with disperse grains while high electric and heat conductivity, as well as heat resistance should be ensured by using composite with a layered structure. At that the high electric and thermal conductivity of the outer layer should be ensured by the low- alloyed copper matrix, while the high mechanical properties and heat resistance of the core- be the high-alloyed non-porous structure copper-based composite material, and in this case non porosity should be ensured by hot extrusion. It is revealed that at hot extrusion, a limiting factor is the stretching coefficient λ, whose growth causes an increase in the mechanical properties of the materials. It is shown that their maximal values are achieved at λ = 4...5. The mechanisms of structure formation and the kinetics of hot extrusion of powder composite materials with compositions 13 percent Ni + 3 percent Al + 1,0 percent Cr + 0,8 percent Zr + Cu_oct are investigated, and optimal modes are selected