位错与扩展障碍物相互作用的线张力模型

U. Messerschmidt
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引用次数: 2

摘要

在线张力模型的框架内,计算了位错切割扩展障碍物对其滑行的“力-距离”关系。处理是基于活化的吉布斯自由能Δ G的测定,包括考虑“化学”术语,指的是结构混乱的产生,线能术语,指的是粒子内外位错长度的变化,以及施加有效应力所做的功。激活量由关系υ =−∂ΔG/∂τ*获得。它等于伯格矢量的绝对值乘以激活过程中粒子和基体中位错扫过的总面积。本文试图澄清扩展障碍物的“激活距离”的概念,这一概念在文献中要么被忽视,要么被错误地对待。对菱形切割平面和不同类型的相互作用进行了算例计算。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Line tension model of the interaction between dislocations and extended obstacles to glide

Within the framework of the line tension model, the “force-distance” relation is calculated for dislocations cutting extended obstacles to their glide. The treatment is based on the determination of the Gibbs free energy of activation Δ G, and includes consideration of “chemical” terms which refer to the creation of structural disorder, line energy terms which refer to the changing lengths of the dislocation inside and outside the particle and the work done by the applied effective stress ɹ*. The activation volume is obtained from the relation υ = −∂ΔG/∂τ*. It turns out to be the absolute value of the Burgers vector multiplied by the total area swept by the dislocation in the particle and in the matrix during the activation event. In this paper an attempt is made to clarify the concept of the “activation distance” for extended obstacles, which in the literature is either ignored or treated incorrectly. Some examples are calculated for a rhomboidal cutting plane and different types of interaction.

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