擬コッセル線による疲労変形の観察

概要

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The structural change of Al crystals due to the cyclic stress in bending was examined by using the back reflection divergent X-ray technique. Al crystals, 99.999% in purity, were made by the strain annealing method. Of crystals thus obtained those of the following three kinds of specimens were used : a bicrystal and two single crystals having the same orientation as those of each part of the bicrystal. The back reflection divergent X-ray photographs of fatigued Al crystals showed the occurrence of polygonization in the early stage of fatigue, but this structure was changed into complicated one with the progress of fatigue process. The fatigue life in the bicrystal was found to be shorter than that in the single crystals, and to form fatigue crack along the crystal boundary. The same experiments were carried out with polycrystalline samples. It was found clear that the degree of deformation varied with the grains, some grains being deformed scarcely even in the later stage of fatigue process. The X-ray photographs obtained from the various stages of fatigue process showed a rapid increase of strain, especially, near the crystal boundary.
社団法人日本材料学会の論文
1968-12-15