抄録
Using the high-purity aluminium bicrystal (99.999%) which has the boundary misorientation angle of 36 deg, observation was made of the behavior of deformation on the grain-boundary and in a narrow region adjacent to the grain-boundary during high-temperature (isothermal) shear test. The high-temperature shear test was carried out in the temperature range of 160°C to 300°C. Grain-boundary sliding (shear) was observed to occur without inducing deformation of the component crystals, accompanied by the localized deformation in a region adjacent to the grain boundary. Measurements were made of the grain-boundary sliding (shear) as a function of shear stress during the test. From the data, the grain-boundary sliding versus shear stress curves were obtained for given temperatures, and a plot of the logarithms of the slopes of the curves versus the reciprocal of shear stress resulted in a series of straight lines. The relationship was discussed by the rate equation. Grain-boundary sliding was found together with zone shear, but not vice versa. Voids were produced by the grain-boundary sliding, and obstructed grain-boundary migration.
