Plastic Deformation of MgO Single Crystals during Cleavage Fracture
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概要
- 論文の詳細を見る
MgO single crystals with 〜10^6 dislocations/cm^2 and 〜1 mm^2 sub-grains are cleaved at a room temperature and observed mostly by limited projection topography. The fresh dislocations nucleated near the cleaved surface are found to be located at the cleavage steps as high as 〜30μm. They are straight edge dislocations in the <100> direction with the separation distance of 14μm, the average length of 0.3 mm and the penetration depth from the surface of 〜10μm. The configuration of these dislocations supports a view that the movement of fresh dislocations contributes to the plastic deformation near the fracture surface during the propagation of the cleavage crack. On the basis of the theory developed by Burns et al., the effective surface energy of MgO during cleaving is estimated to be higher than its intrinsic surface energy by several percent. This value of increment is much smaller than that estimated for LiF.
- 社団法人応用物理学会の論文
- 1972-09-05
著者
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Futagami Koji
Research Institute For Applied Mechanics Kyushu University
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Futagami Koji
Department Of Applied Physics Faculty Of Engineering Miyazaki University
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Futagami Koji
Research Institute For Applied Mechanics University Of Kyushu
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Akashi Yoshito
Research Institute For Applied Mechanics Kyushu University
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