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Anisotropic size effect in strength in coherent nanowires with tilted twins

机译:各向异性双胞胎中倾斜尺寸的各向异性尺寸对强度的影响

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摘要

When materials are deformed plastically via dislocations, a general finding is that samples with smaller dimensions exhibit higher strengths but with very limited amount of plasticity in tension. Here we report that one-dimensional coherent nanostructures with tilted internal twins exhibit anisotropic size effect: their strengths show no apparent change if only their thicknesses reduce, but become stronger as the sample sizes are reduced proportionally. Large-scale molecular dynamics simulations show that such nanowires deform primarily through twin migration mediated by partial dislocations in one active slip system, and a large amount of plasticity could be achieved in such nanowires via twin migration. The unique structure shown here is suitable to explore strengthening mechanisms in metals when plasticity is controlled by a single dislocation slip system. This study also suggests a novel approach to modulate strength and ductility in one-dimensional coherent nanostructures.
机译:当材料通过位错发生塑性变形时,通常的发现是较小尺寸的样品显示出较高的强度,但拉伸塑性非常有限。在这里,我们报道具有倾斜的内部孪晶的一维相干纳米结构表现出各向异性的尺寸效应:如果仅减小其厚度,它们的强度就不会表现出明显的变化,但是随着样品尺寸的成比例地减小,它们的强度会变强。大规模的分子动力学模拟表明,这种纳米线主要通过在一个活性滑移系统中由部分位错介导的孪生迁移而变形,并且可以通过孪生迁移在此类纳米线上获得大量可塑性。当通过单个位错滑移系统控制塑性时,此处显示的独特结构适合探索金属中的强化机制。这项研究还提出了一种新的方法来调节一维相干纳米结构中的强度和延展性。

著录项

  • 来源
    《Physical review》 |2011年第1期|p.014107.1-014107.6|共6页
  • 作者

    Yujie Wei;

  • 作者单位

    State Key Laboratory of Nonlinear Mechanics, Institute of Mechanics, Chinese Academy of Sciences, Beijing 100190, P.R. China;

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  • 正文语种 eng
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