双层金属纳米板界面能密度的尺寸效应

发布时间：2018-04-28 13:56

本文选题：双材料金属界面 + 分子动力学　；参考：《力学学报》2017年05期

【摘要】：界面能密度是表征纳米复合材料与结构界面力学性质的重要物理量.采用分子动力学方法计算了不同面心立方金属晶体构成的双材料纳米薄板结构的界面能密度,分析了界面晶格结构形貌变化及界面效应对原子势能的影响.结果表明:双材料纳米薄板界面具有周期性褶皱状疏密相间的晶格结构形貌,界面上原子势能亦呈现周期性分布特性,而靠近界面的两侧原子势能与板内原子势能具有明显差异.拉格朗日界面能密度和欧拉界面能密度均随双层薄板厚度的增加而增加,最终趋向于块体双材料结构的界面能密度.
[Abstract]:Interfacial energy density is an important physical quantity to characterize the mechanical properties of nanocomposites and structural interfaces. The interfacial energy density of bimaterial nanocrystalline thin plates composed of different face-centered cubic metal crystals was calculated by molecular dynamics method. The morphology of interfacial lattice and the effect of interfacial effect on atomic potential energy were analyzed. The results show that the interface of bimaterial nanocrystalline thin plate has the lattice structure morphology with periodic folded and dense phases, and the potential energy of atoms on the interface also exhibits periodic distribution. However, the atomic potential energy near the interface is obviously different from that of the intraplate atom. Both Lagrange interface energy density and Euler interface energy density increase with the increase of the thickness of the bilayer thin plate, and eventually tend to the interfacial energy density of the bulk bimaterial structure.
【作者单位】：中国科学院力学研究所非线性力学国家重点实验室;中国科学院大学工程科学学院;北京理工大学先进结构技术研究院轻量化多功能复合材料与结构北京市重点实验室;北京理工大学北京电动车辆协同创新中心;
【基金】：国家自然科学基金(11372317,11532013,11402270) 北京理工大学科研创新计划资助项目
【分类号】：TB383.1

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