Elastic interactions between screw dislocations in iron

IF 1.9 4区材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY

Modelling and Simulation in Materials Science and Engineering Pub Date : 2024-02-15 DOI:10.1088/1361-651x/ad29b0

Daniel Caillard

引用次数: 0

Abstract

The kinetics of elastically interacting screw dislocations has been studied in pure iron strained in situ at low temperature. Annihilating and expanding screw dipoles yield macroscopic activation areas which are substantially smaller than those deduced from conventional mechanical stress, but consistent with theoretical estimates.The kinetics of attractive intersecting screw dislocations indicates that their velocity is determined by the velocity of their most stressed parts. Repulsive screw dislocations with different Burgers vectors can move cooperatively at a surprisingly high velocity, probably on elastic torque interactions and twinning-anti-twinning effects. All these interactions are shown to play an important role in the description of macroscopic mechanical properties in terms of individual dislocation mechanisms.

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铁中螺钉位错之间的弹性相互作用

在低温原位应变的纯铁中研究了弹性相互作用的螺旋位错动力学。湮灭和膨胀的螺钉偶极子产生的宏观活化面积大大小于从传统机械应力推导出的面积，但与理论估计值一致。具有不同伯格斯矢量的斥性螺位错能以惊人的速度协同移动，这可能是由于弹性扭矩相互作用和孪生-反孪生效应。研究表明，所有这些相互作用在用单个位错机制描述宏观机械特性方面发挥着重要作用。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Modelling and Simulation in Materials Science and Engineering 工程技术-材料科学：综合

CiteScore

3.30

自引率

5.60%

发文量

审稿时长

1.7 months

期刊介绍： Serving the multidisciplinary materials community, the journal aims to publish new research work that advances the understanding and prediction of material behaviour at scales from atomistic to macroscopic through modelling and simulation. Subject coverage: Modelling and/or simulation across materials science that emphasizes fundamental materials issues advancing the understanding and prediction of material behaviour. Interdisciplinary research that tackles challenging and complex materials problems where the governing phenomena may span different scales of materials behaviour, with an emphasis on the development of quantitative approaches to explain and predict experimental observations. Material processing that advances the fundamental materials science and engineering underpinning the connection between processing and properties. Covering all classes of materials, and mechanical, microstructural, electronic, chemical, biological, and optical properties.