THE INTERACTION BETWEEN SLIP AND TWINNING SYSTEMS AND THE INFLUENCE OF TWINNING ON THE MECHANICAL-BEHAVIOR OF FCC METALS AND ALLOYS
THE INTERACTION BETWEEN SLIP AND TWINNING SYSTEMS AND THE INFLUENCE OF TWINNING ON THE MECHANICAL-BEHAVIOR OF FCC METALS AND ALLOYS
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DOI：
10.1007/bf02648536
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发表时间：
1981-01-01
期刊：
影响因子：
--
通讯作者：
REMY, L
中科院分区：
文献类型：
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作者：
REMY, L
本文用Sleeswyk和Verbraak提出的体心立方孪晶间相互作用的分析方法，对面心立方晶体中孪晶滑移和孪晶间相互作用的分析进行了评述。滑移或孪晶位错撞击孪晶界通常可以通过不利的位错反应并入障碍孪晶。透射电子显微镜观察结果与预测的应力松弛机制一致。与博尔曼的概念，更一般的边界，适用于这些简单的<$= 3边界的链接被强调。然而，指出了此类分析的局限性，特别是它们无法预测应力条件的影响。通过对孪晶界面相互作用的分析和观察，初步概述了孪晶对面心立方金属及合金加工硬化和断裂的影响。特别地，孪晶可以引起流动应力的增加，特别是在多晶体中，并且它实际上是许多商业组合物的高机械性能的原因。本文报道了孪晶在面心立方材料的快速断裂和疲劳断裂中所起作用的实验证据，这与从各种相互作用的研究中得出的推论是一致的。
The analysis of twin-slip and twin-twin interactions in fcc crystals is reviewed using the method proposed by Sleeswyk and Verbraak for the interactions between bcc twins. Slip or twinning dislocations impinging a twin boundary can generally be incorporated into the obstacle twin through often unfavorable dislocation reactions. Transmission electron microscopy observations are in agreement with the predicted mechanisms of stress relaxation. The link with Bollmann’s concepts for more general boundaries as applied to these simple Σ = 3 boundaries is emphasized. However the limitations of such analyses are pointed out particularly their inability to predict the influence of stress conditions. From the analysis and observations of interactions at twin boundaries the influence of twinning on work-hardening and fracture in fcc metals and alloys is tentatively outlined. In particular twinning can give rise to an increase of the flow stress particularly in polycrystals and it is actually responsible of the high mechanical properties of a number of commercial compositions. Experimental evidences of the role of twinning in the fast fracture and the fatigue fracture of fcc materials are reported which are in agreement with the inferences made from the study of various interactions.