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＜紀要論文＞
STUDY ON THE PLASTIC DEFORMATION DURING CLEAVAGE ON MgO SINGLE CRYSTALS
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| 概要 | MgO single crystals with ～10^6 dislocations/cm^2 and ～ 1mm^2 sub-grains are cleaved at room temperature and observed mainly by limited projection topography. The fresh dislocations nucleated near the ...cleaved surface are found at large cleavage step of ～30μ in height. They are straight edge dislocations in the 〈100〉 direction with separation distance 14μ, average length 0.3 mm and penetration depth from the surface～10μ. The configuration of these dislocations supports the mechanism of fracture proposed by Gilman and Kitajima, that the movement of these nucleated dislocations contributes to the plastic deformation near the fracture surface during the propagation of cleavage crack. On the basis of the theory developed by Burns et al., the increment in the effective surface energy during cleavage is estimated to be several percent of the intrinsic one, which is much smaller than that measured on LiF.続きを見る |
| 目次 | 1. Introduction 2. Experimental Procedures 3. Experimental Results 4. Discussions |
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| 登録日 | 2024.04.11 |
| 更新日 | 2024.10.22 |