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It is well known that α-Al2O3 is a heat and corrosion resistant material and its properties are affected by grain size, crystallographic orientation of grain and dopants. Cr2O3-doped Al2O3 is expected... to be used as high quality refractories for waste melting furnaces. Cr2O3-doped Al2O3 sintered material has heavy anisotropic and abnormal grains whose boundaries growing into parallel to the longest radii are straight. In this study, grain boundary nature, that is common axis and rotation angle, of abnormal grains was investigated by TEM/Kikuchi pattern method. It was found that the abnormal grain had not specific orientation with neighboring grains and its growth characters strongly depended on grain boundary plane orientation and surface energy of each boundary plane.続きを見る
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