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首页> 外文期刊>Materials Science and Engineering >Length-scale-dependent mechanical behaviour of Zr/Nb multilayers as a function of individual layer thickness
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Length-scale-dependent mechanical behaviour of Zr/Nb multilayers as a function of individual layer thickness

机译：Zr / Nb多层膜的长度尺度相关的机械行为随单个层厚度的变化

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摘要

Nanostructured metallic multilayers systems continue to garner interest because of their promising mechanical properties, exploitable in the field of materials engineering. These novel materials show high yield strengths, anomalous Young's modulus values and even superior radiation tolerance for layer thicknesses up to a few tens of nanometers. However, there are still many unknowns related to the deformation mechanisms operating at the nanoscale because of deformation mechanisms, in this nanoscale, depend directly on the layer thickness and the combination of different or similar crystal structures in the interface. The objective of this work is to produce Zr/Nb multilayers and investigate the dependence of deformation mechanisms when the layer thickness is reduced. Nanoindentation hardness as a function of periodicity, λ, has been measured for Zr/Nb multilayers. It has been found that for decreasing h the yield strength values, σ_(2.7), do not increase. For λ=60 nm and λ=30 nm, σ_(2.7) values are almost constant: 1.97 and 1.93 GPa, respectively, whereas for λ=10 nm, the yield strength shows a decrease to 1.79 GPa. The mismatch between σ_(2.7) and σ_(CLS) values for any core cut-off, α, condition (0.2 and 1) and for any η ratio (η= h_(Zr)/h_(Nb)), indicates that the strain mechanism based on CLS did not occur for any period studied; therefore, the strain mechanism based on IBS is suggested, in accord with the activation of a pyramidal slip system {1122}<1123>, along Zr layer, even for thickness up to 30 nm. Thereby, dislocation loop glide is not confined to an isolated layer, changing the plastic behaviour of the nano-multilayer.
机译：纳米结构的金属多层系统由于其有前途的机械性能而不断引起人们的兴趣，可在材料工程领域中得到利用。这些新颖的材料显示出高的屈服强度，异常的杨氏模量值，甚至对于几十纳米的层厚度都具有出色的辐射耐受性。然而，由于在该纳米尺度上的变形机理，仍然存在许多与在纳米尺度上操作的变形机理相关的未知数，该变形机理直接取决于层厚度以及界面中不同或相似晶体结构的组合。这项工作的目的是生产Zr / Nb多层膜，并研究降低层厚时变形机制的依赖性。对于Zr / Nb多层膜，已测量出纳米压痕硬度与周期λ的关系。已经发现，为了减小h，屈服强度值σ_（2.7）不会增加。对于λ= 60 nm和λ= 30 nm，σ_（2.7）值几乎恒定：分别为1.97和1.93 GPa，而对于λ= 10 nm，屈服强度显示降低至1.79 GPa。对于任何铁心截止值α，条件（0.2和1）和任何η比（η= h_（Zr）/ h_（Nb）），σ_（2.7）和σ_（CLS）值之间的不匹配表示在研究的任何时期都没有发生基于CLS的应变机制。因此，即使是在厚度最大为30 nm的情况下，也要根据Zr层的锥体滑移系统{1122} <1123>的激活，提出基于IBS的应变机制。因此，位错环滑动不限于隔离层，从而改变了纳米多层的塑性行为。

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  • 来源
    《Materials Science and Engineering》 |2015年第24期|137-146|共10页
  • 作者

    E. Frutos; M. Callisti; M. Karlik; T. Polcar;

  • 作者单位

    Department of Control Engineering, Faculty of Electrical Engineering, Czech Technical University in Prague, Technicka 2, Prague 6, 166 27, Czech Republic;

    Engineering Materials, University of Southampton, University Road, Southampton SO17 1BJ, UK;

    Department of Materials, Faculty of Nuclear Sciences and Physical Engineering, Czech Technical University in Prague, Trojanova 13, 120 00 Prague 2, Czech Republic;

    Department of Control Engineering, Faculty of Electrical Engineering, Czech Technical University in Prague, Technicka 2, Prague 6, 166 27, Czech Republic,Engineering Materials, University of Southampton, University Road, Southampton SO17 1BJ, UK;

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  • 正文语种 eng
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  • 关键词

    Nanostructured multilayers; Plastic deformation; Length scale; Strain softening; Yield strenght;

    机译：纳米结构多层;塑性变形;长度刻度;应变软化;屈服强度;

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