有限温度におけるα-Fe中の刃状転位芯構造の分子動力学法を用いた研究

概要

論文の詳細を見る
Molecular dynamics study of the core structure of an edge dislocation in \alpha-Fe at finite temperatures has been performed in order to obtain the basic information on the temperature dependence of the lattice resistance of the dislocation or the interaction between a dislocation and point defects. The edge dislocation of the Burgers vector a/2<111> on {110} atomic plane was inserted into the model iron lattice and was relaxed statically at 0 K first and then relaxed again at 300 K to obtain the stable core structure at this temperature. The Burgers vector distribution of the infinitesimal edge dislocations which constructs the inserted edge dislocation was obtained for 0 K and 300 K. The former shows a sharp distribution within about 8b, but the latter shows a rather wide distribution with a lower peak which extends over more than 10b, with a considerable atomic fluctuation. This suggests that the property of the edge dislocation at finite temperatures is significantly different from that at very Iow temperatures, especially in the mechanical behaviour or the interaction wlth point defects.
九州大学の論文