Bicrystals of a Cu-0.065wt%B solid-solution alloy, which had [001] twist grain boundaries of various misorientations, were prepared by using the Bridgman method. Bicrystals of Cu which contained B2O3 particles were made from the bicrystals by performing internal oxidation treatment. The Cu- B2O3 bicrystals were tensile-tested at temperatures where the B2O3 particles became liquid. The amount of grain-boundary sliding was then deduced from the amount of shear deformation of the liquid B2O3 particles on a sliding grain boundary. The shear deformation of voids where the B2O3 particles were embedded was also used to determine the amount of grain-boundary sliding. Because the liquid B2O3 particles deformed easily at high temperatures, the measured amount of grain-boundary sliding was considered to reflect the inherent nature of the Cu [001] twist grain boundaries. By using the present method, up to 2μm of grain-boundary sliding could be measured with an accuracy of about 0.1μm.

Sliding of Copper [001]-Twist Grain Boundaries Detected by Shear Deformation of Liquid B2O3 Particles on the Grain Boundaries. H.Miura, T.Sakai, T.Otsuka, R.Monzen, S.Onaka: Acta Materialia, 2000, 48[8], 1959-66