Pressure Effect on Diffusion Properties of Grain Boundaries

E. S. Smirnova and V. N. Chuvil’deev

Research Physicotechnical Institute, Lobachevskii Nizhnii Novgorod University,
pr. Gagarina 23, kor. 3, Nizhnii Novgorod, 603600 Russia

Received August 5, 1996

Abstract—A theoretical investigation is conducted of the influence of hydrostatic pressure on the process of
diffusion along grain boundaries and grain-boundary migration in metallic materials. A model is proposed that
allows one to calculate the changes caused by hydrostatic pressure in the activation energy for grain-boundary
self-diffusion and in grain-boundary diffusivity. The model is based on the assumption that grain boundaries
have an island structure and that the free volume of grain boundaries is a linear function of hydrostatic pressure.

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