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Tensile test pieces of aluminium bi-crystal were obtained by the strain annealing method from commercial aluminium plate. Orthogonal grids of 20lines/mm were printed on the surfaces of the specimens. The plastic deformation of these specimens were measured by the usual moire technique. The amount of deformation obtained experimentally almost agrees with that calculated on the basis of slip of crystal plane, but it becomes small near the grain boundary. That is, the grain boundaries tend to restrict deformation of crystals. The distribution of elongation in the neighborhood of grain boundaries is similar to the result obtained by Urie and Wain4). The effect of grain bondaries reaches to 2∼5mm from grain boundary. It seems that the extent of such region is related to the Schmidt's factors of bi-crystals and their slip direction.Next, to examine the rotation of crystal lattice induced by plastic deformation, Laue photographs were taken. For this purpose, about ten slits of 4cm in length and 0.45mm in diameter were set in a row. This slits system makes it possible to take Laue patterns around the grain boundary on a X-ray film. It was observed that the amount of rotation of crystal lattice and the direction of its rotation axis are abnormal in the neighborhood of grain boundary.

Effect of Grain-Boundary on the Tensile Plastic Deformation of Aluminium Bi-Crystal