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Homogenization of plastic deformation in metallic glass foils less than one micrometer thick

机译：小于一微米厚的金属玻璃箔中塑性变形的均质化

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摘要

Metallic glasses do not possess crystalline structures with slip systems that provide for plastic deformation via dislocation glide. As such, when put under applied stress, they show a wide reversible elastic deformation ε_(el) ≈ 2% before plastic flow occurs heterogeneously by localization in shear bands only tens of nanometers in thickness. Very recently, there have been reports that in microscopic (submicron thickness) pillars, such shear bands no longer form and deformation occurs homogeneously. Here we report on plastic deformation of submicron thickness foils of metallic glasses. When such foils are compressed or notched, a similar transition occurs from the usual heterogeneous plastic deformation mode via shear banding to more homogeneous deformation without formation of shear bands. Some shape instabilities in the form of vortices observed at interfaces between plastic zones and nondeformed regions are consistent with sharp deformation-induced density, velocity, and viscosity gradients. The onset of homogeneous deformation in the microscopic regime is discussed in relation to shear-band formation energy and thickness.
机译：金属玻璃不具有带有滑移系统的晶体结构，该滑移系统通过位错滑动提供塑性变形。这样，当受到外加应力作用时，在塑性流通过局部位于厚度仅为几十纳米的剪切带中而异质地发生之前，它们会表现出较大的可逆弹性变形ε_（el）≈2％。最近，有报道说，在微观（亚微米厚度）的支柱中，这样的剪切带不再形成，变形均匀地发生。在这里，我们报告了金属玻璃亚微米厚度箔的塑性变形。当这些箔片被压缩或开槽时，会从通常的非均质塑性变形模式通过剪切带发生类似的过渡，而不会形成剪切带，从而产生更均匀的变形。在塑料区域和未变形区域之间的界面处观察到的一些形式的旋涡形式的不稳定性与急剧的形变引起的密度，速度和粘度梯度一致。关于剪切带形成能和厚度，讨论了微观状态下均匀变形的开始。

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  • 来源
    《Physical review》 |2010年第17期|p.172202.1-172202.4|共4页
  • 作者

    A. R. Yavari; K. Georgarakis; W. J. Botta; A. Inoue; G. Vaughan;

  • 作者单位

    Institut Polytechnique de Grenoble (INPG), Euronano SIMaP-CNRS, 38402, St-Martin-d'Heres Campus, France,WPIAIMR, Tohoku University, Sendai 980-8577, Japan,Department of Materials Engineering (DeMa), Federal University of Sao Carlos (UFSCar), CEP 13565-905, Sao Carlos, Sao Paulo, Brazil,European Synchrotron Radiation Facility (ESRF), Grenoble, France;

    WPIAIMR, Tohoku University, Sendai 980-8577, Japan,Institut Polytechnique de Grenoble (INPG), Euronano SIMaP-CNRS, 38402, St-Martin-d'Heres Campus, France;

    Department of Materials Engineering (DeMa), Federal University of Sao Carlos (UFSCar), CEP 13565-905, Sao Carlos, Sao Paulo, Brazil,Institut Polytechnique de Grenoble (INPG), Euronano SIMaP-CNRS, 38402, St-Martin-d'Heres Campus, France;

    WPIAIMR, Tohoku University, Sendai 980-8577, Japan;

    European Synchrotron Radiation Facility (ESRF), Grenoble, France;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    glasses (including metallic glasses); amorphous semiconductors, metals, and alloys; deformation, plasticity, and creep;

    机译：眼镜（包括金属眼镜）;非晶半导体;金属和合金;变形;可塑性和蠕变;

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