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Shear bands in metallic glasses

机译：金属玻璃剪力带

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摘要

Shear-banding is a ubiquitous plastic-deformation mode in materials. In metallic glasses, shear bands are particularly important as they play the decisive role in controlling plasticity and failure at room temperature. While there have been several reviews on the general mechanical properties of metallic glasses, a pressing need remains for an overview focused exclusively on shear bands, which have received tremendous attention in the past several years. This article attempts to provide a comprehensive and up-to-date review on the rapid progress achieved very recently on this subject. We describe the shear bands from the inside out, and treat key materials-science issues of general interest, including the initiation of shear localization starting from shear transformations, the temperature and velocity reached in the propagating or sliding band, the structural evolution inside the shear-band material, and the parameters that strongly influence shear-banding. Several new discoveries and concepts, such as stick-slip cold shear-banding and strength/plasticity enhancement at sub-micrometer sample sizes, will also be highlighted. The understanding built-up from these accounts will be used to explain the successful control of shear bands achieved so far in the laboratory. The review also identifies a number of key remaining questions to be answered, and presents an outlook for the field.
机译：剪切带是材料中普遍存在的塑性变形模式。在金属玻璃中，剪切带尤其重要，因为它们在控制室温下的可塑性和破坏方面起着决定性的作用。尽管已经对金属玻璃的一般机械性能进行了多次评论，但迫切需要仅专注于剪切带的概述，在过去的几年中，这种剪切带引起了极大的关注。本文试图就最近在此主题上取得的快速进展提供全面而最新的评论。我们从内到外描述剪切带，并处理普遍关注的关键材料科学问题，包括从剪切转变开始的剪切局部化，在传播或滑动带中达到的温度和速度，剪切内部的结构演变带材料，以及影响剪切带的参数。还将突出一些新发现和新概念，例如粘滑滑动剪切带和亚微米样品尺寸下的强度/塑性增强。从这些说明中积累的理解将用于解释迄今为止在实验室中成功实现的剪切带控制。审查还确定了一些尚待解决的关键问题，并提出了对该领域的展望。

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  • 来源
    《Materials Science & Engineering》 |2013年第4期|71-132|共62页
  • 作者

    A.L. Greer; Y.Q. Cheng; E. Ma;

  • 作者单位

    Department of Materials Science & Metallurgy, University of Cambridge, Cambridge CB2 3QZ, UK ,WPI-Advanced Institute for Materials Research (WPI-AIMR), Tohoku University, Sendai 980-8577, Japan;

    Chemical and Engineering Materials Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA;

    Department of Materials Science and Engineering, The Johns Hopkins University, Baltimore, MD 21218, USA;

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