The dependence of grain-boundary sliding on shear stress

Abstract

Polycrystalline specimens of four materials: aluminium, a lead/thallium alloy,
/3-brass and Magnox AL80 were subjected to slow creep at a temperature of approximately 0.5 Tm (where Tm is the melting temperature in degrees Kelvin) and measurements made of the dependence of grain-boundary sliding on the orientation of the boundary with respect to the applied stress. The results were analysed in detail on the basis of the hypothesis that sliding is governed by the component of the applied stress resolved in the boundary plane. Agreement between theory and experiment leads to the conclusion that this is a most important factor governing sliding. The component of sliding revealed by steps on a free surface is seen to contain an extra term due to the unbalanced pressure
from grains below the surface.

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ORCID for Terence G Langdon: orcid.org/0000-0003-3541-9250

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