Viscous Slip Along Grain Boundaries and Diffusion of Zinc in Alpha-Brass

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Abstract
The viscous behavior of the grain boundaries in 70–30 alpha-brass was demonstrated by anelastic measurements. It was shown that the grain boundaries cannot sustain permanently a shear stress and have a coefficient of viscosity decreasing with an increase of temperature. Using the same alpha-brass specimen, the activation energy associated with the stress-induced preferential orientation of pairs of zinc atoms in alpha-brass (which is a diffusion process) was determined. This activation energy was found to be identical, within experimental error, to the activation energy associated with the grain boundary slip in alpha-brass. This finding indicates that the grain boundary slip in alpha-brass is a diffusion process and the diffusion mechanism is similar to the volume diffusion in alpha-brass.