| 金属纳米膜的局域力学性质 |
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| 引用本文： | 刘斌杰,杨阳阳,林平,齐新,闫雪松.金属纳米膜的局域力学性质[J].材料导报,2012,26(2):150-153. |
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| 作者姓名： | 刘斌杰 杨阳阳 林平 齐新 闫雪松 |
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| 作者单位： | 1. 中国科学院近代物理研究所,兰州730000;中国科学院研究生院,北京100086
2. 中国科学院近代物理研究所,兰州,730000 |
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| 基金项目： | 中科院“战略性先导专项”，国家自然科学基金 |
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| 摘 要： | 应力涨落法是一种研究材料力学性质的有效方法。采用应力涨落法和一种解析方法计算超低温纳米膜的局域弹性常数并分别以Lennard-Jones(L-J)势和紧束缚势二阶矩(TB-SMA)近似为例,比较了两体势与多体势模型的不同。两种方法的结果都表明膜表面软于内部,而多体势(TB-SMA)模型膜中的次外层是最硬的。对比不同温度下应力涨落方法得到的结果,发现随着温度的升高两种势模型的纳米膜都会变软。
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| 关 键 词： | 纳米膜 应力涨落方法 弹性常数 |
Distribution of Local Elastic Constants in Nanofilms of Metals |
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| LIU Binjie
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YANG Yangyang
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LIN Ping
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QI Xin
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YAN Xuesong.Distribution of Local Elastic Constants in Nanofilms of Metals[J].Materials Review,2012,26(2):150-153. |
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| Authors: | LIU Binjie YANG Yangyang LIN Ping QI Xin YAN Xuesong |
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| Affiliation: | 1(1 Institute of Modern Physics,Chinese Academy of Sciences,Lanzhou 730000;2 Graduate School of the Chinese Academyof Sciences,Beijing 100086) |
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| Abstract: | The stress-fluctuation approach provides an useful tool to study the mechanical properties of mate-rials.The stress-fluctuation approach and an analytical method were used to study the distribution of local elastic constants of nanofilms.The L-J and TB-SMA potentials were used as models to investigate the differences between the pair-wise and many-body atomic interaction of nanofilms.Both of simulation and analytical results show that for L-J nanofilms,layers near the free surface are softer than the interior layers,which is in agreement with previous reports,and for TB-SMA nanofilms,the outmost layers are softer,while the secondary outer layers are stiffer than the interior layers.Furthermore,as the temperature increases,both of the L-J and TB-SMA nanofilms are softened by the temperature effect. |
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| Keywords: | nanofilms stress fluctuation approach elastic constants |
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