The effect of solute segregation on strain localization in nanocrystalline thin films: Dislocation glide vs. grain-boundary mediated plasticity

Jochen Lohmiller; Aaron Kobler; Ralph Spolenak; Patric A. Gruber

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The effect of solute segregation on strain localization in nanocrystalline thin films: Dislocation glide vs. grain-boundary mediated plasticity

机译：溶质偏析对纳米晶薄膜应变局部化的影响：位错滑移与晶界介导的可塑性

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Deformation mechanisms of nanocrystalline Au and AuCu thin films on compliant substrates were investigated by synchrotron-based in situ tensile testing and Automated Crystal Orientation Mapping using transmission electron microscopy. The results demonstrate that intragranular dislocation plasticity, inferred from evolution of deformation texture, is responsible for the formation of periodic and ordered shear bands in AuCu films. In contrast, pure Au films deform homogeneously without shear band formation and without evolution of deformation texture. Cu solutes are deemed to pin grain boundaries thereby enforce dislocation glide, while in pure Au, plasticity is carried by grain boundary shear and grain boundary migration.

机译：通过基于同步加速器的原位拉伸测试和使用透射电子显微镜的自动晶体取向图研究了纳米晶体金和金铜薄膜在顺应性基板上的变形机理。结果表明，从变形织构的演化推断出晶内位错可塑性是造成AuCu膜中周期性和有序剪切带形成的原因。相反，纯金膜均匀地变形而没有剪切带的形成和变形纹理的发展。铜溶质被认为会钉住晶界，从而增强位错滑动，而在纯金中，可塑性由晶界剪切和晶界迁移来承载。

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来源
《Applied Physics Letters》 |2013年第24期|241916.1-241916.4|共4页
作者
Jochen Lohmiller; Aaron Kobler; Ralph Spolenak; Patric A. Gruber;
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作者单位

Institute for Applied Materials, Karlsruhe Institute of Technology, P.O. Box 3640, 76021 Karlsruhe, Germany;

Institute for Nanotechnology, Karlsruhe Institute of Technology, P.O. Box 3640, 76021 Karlsruhe, Germany;

Laboratory for Nanometallurgy, Department of Materials, ETH Zurich, Wolfgang-Pauli-Str. 10, 8093 Zurich, Switzerland;

Institute for Applied Materials, Karlsruhe Institute of Technology, P.O. Box 3640, 76021 Karlsruhe, Germany;

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收录信息美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
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正文语种 eng
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The effect of solute segregation on strain localization in nanocrystalline thin films: Dislocation glide vs. grain-boundary mediated plasticity

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