Self-Diffusion in Silver during Plastic Deformation in Extension and Compression

Abstract

Self‐diffusion of Ag¹¹⁰ in silver single crystals subjected to simultaneous deformation at 800 and 900°C was studied using the sectioning technique. The crystals were orientated for duplex slip and were deformed in extension and compression at constant strain rates in the range 1 to 28×10⁻⁵ sec.⁻¹. Total strains as large as 0.33 were attained. Recrystallization occurred in the initially single crystal specimens during diffusion‐deformation under all conditions except tension at 800°C. The effect of straining on the rate of diffusion was found to be small in all cases. The straining changed the diffusivities by less than 50%, and it is concluded that the observed changes were probably within the experimental error. The results indicate that any increases in diffusion rate due to the generation of point defects or short‐circuiting paths during deformation were small. These conclusions are shown to be consistent with other experiments involving these phenomena.