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首页> 外文期刊>Physical review >Molecular dynamics characterization of the contact between clean metallic surfaces with nanoscale asperities
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Molecular dynamics characterization of the contact between clean metallic surfaces with nanoscale asperities

机译：具有纳米级凹凸的清洁金属表面之间接触的分子动力学表征

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摘要

We use molecular dynamics (MD) simulations to characterize the tensile strength of contacts formed between various clean platinum surfaces with nanoscale asperities. Both commensurate contacts between (001) and (111) surfaces and incommensurate (001) ones are considered over a wide range of asperity sizes. In cyclic closing and opening, fresh asperities that form contacts for the first time show significant plastic deformation; this leads to a reduction in the effective contact area during the first few cycles, after which steady state is achieved both in terms of contact size and the pull-out force necessary to open the contacts. As is the case for commensurate surfaces [H. Kim and A. Strachan, Phys. Rev. Lett. 104, 215504 (2010)], the strength of the metallic bridges that form in incommensurate contacts exhibit strong size effects; their strength increases with decreasing size until a length of ～5 nm, below which weakening is observed. Commensurate contacts lead to stronger bridges than incommensurate ones but only during the initial closing events; after steady state is achieved, commensurate and incommensurate (001) surfaces lead to bridges of similar strengths.
机译：我们使用分子动力学（MD）模拟来表征具有纳米级凹凸的各种清洁铂表面之间形成的接触的拉伸强度。 （001）和（111）表面之间的相应接触以及不规则（001）表面之间的接触都被认为在较大的粗糙尺寸范围内。在周期性的闭合和打开过程中，首次形成接触的新鲜粗糙物会出现明显的塑性变形；这导致在前几个循环中有效接触面积的减小，此后，无论是接触尺寸还是断开触点所需的拔出力都达到了稳定状态。相应表面的情况也是如此[H. Kim和A. Strachan，物理学。牧师104，215504（2010）]，在不相称的接触中形成的金属桥的强度表现出强烈的尺寸效应；它们的强度随着尺寸的减小而增加，直至长度达到〜5 nm，在此之下观察到强度减弱。相称的联系比不相称的联系导致更牢固的桥梁，但仅在最初的关闭事件期间才发生。在达到稳定状态后，相称和不相称（001）的表面会导致强度相似的桥。

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  • 来源
    《Physical review》 |2011年第2期|p.024108.1-024108.7|共7页
  • 作者

    Hojin Kim; Alejandro Strachan;

  • 作者单位

    School of Materials Engineering and Birck Nanotechnology Center, Purdue University, West Lafayette, Indiana 47907, USA;

    School of Materials Engineering and Birck Nanotechnology Center, Purdue University, West Lafayette, Indiana 47907, USA;

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  • 正文语种 eng
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  • 关键词

    nanocontacts;

    机译：纳米接触;

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