Al 双結晶の塑性変形に及ぼす結晶粒界の影響

概要

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Tensile test pieces of aluminium bi-crystal were obtained by the strain annealing method from commercial aluminum plate. Orthogonal grids of 20 lines/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 Wain. The effect of grain boundaries reaches to 2〜5 mm 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 4 cm in length and 0.45 mm 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 grain boundary.
社団法人日本材料学会の論文
1974-02-15