Search

Tetragonal hen egg-white lysozyme crystals were grown by the solubility-gradient method. Laue topography using the synchrotron radiation was applied for the identifications of the imperfection of the grown crystals. Some defect images were clearly observed on the topographs., 資料番号: AA0048095023

鉄モデル結晶中に格子間原子型転位ループを〈111〉クラウディオンから構成し，軸対称の剪断応力の下での運動を観察した．転位ループの持つバーガースベクトルの分布は基本的には直線状刃状転位のバーガースベクトル分布と差がないが，ループサイズが小さくなるとなめらかさを失う．転位ループのすべり運動に必要な応力，すなわちループのパイエルス応力はループサイズの増大とともに減少し，直線状刃状転位のパイエルス応力に近づく．

A computer simulation of core structure and slip motion of a screw dislocation in F. C. C crysta1, especially in copper crystal, has been performed by using Finnis-Sinclair potential in a model lattice. Because of its structural stability of stacking fault on {111} plane, an extended screw dislocation was energetically favoured over a perfect screw dislocation. After introducing this extended screw dislocation into the model crystal, the aspect of the slip motion under applied shear stress was studied. Then we introduced a self-interstitial atom (SIA) in the crystal and investigated the interaction between the extended screw dislocation and a SIA under the shear stress. The elementary process of the interference mechanism for dislocation motion caused by a SIA was explained from the atomistic view point instead of the conventional string model.