| 李生飞,倪玉山.压头不同晶向下纳米压痕的多尺度研究[J].计算力学学报,2015,32(3):346~352 |
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| 压头不同晶向下纳米压痕的多尺度研究 |
| Effect of indenter's crystalline anisotropy on nanoindentation by multiscale analysis |
| 投稿时间：2014-04-23 修订日期：2014-06-25 |
| DOI：10.7511/jslx201503008 |
| 中文关键词: 纳米压痕 晶体各向异性 失配位错 应力分布 |
| 英文关键词:nanoindentation crystalline anisotropy misfit dislocation stress distribution |
| 基金项目:国家自然科学基金(10576010)资助项目. |
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| 中文摘要: |
| 为了研究压头晶体各向异性对纳米压痕的影响,采用多尺度准连续介质(QC)法模拟了不同晶向Ni压头与Ag薄膜的纳米压痕过程。通过对比不同晶向下压头在薄膜上触发的原子滑移,发现压头的晶向引起的界面失配位错在很大程度上决定薄膜开启初始原子滑移系的难易。然后对比了压头在不同晶向下测得的薄膜纳米硬度,发现其计算值是一样的。最后研究压头表面和压痕表面的正应力和切应力的分布,分析了应力分布与原子滑移系的关系。 |
| 英文摘要: |
| Ni indenter and Ag thin film are used to research the effect of indenter's crystalline anisotropy on nanoindentation by quasicontinuum method.Ni indenter in different crystal direction presses into Ag thin film,respectively.The atomic slips which triggered by different indenter are compared with each other.According to the result,the misfit dislocation is a very important factor to determine emission of atomic slip.The nanohardness of Ag thin film is calculated.The values of Ag hardness we got are the same when the crystal direction of Ni indenter is different.The normal stress and shear stress on the indenter surface is studied and the relationship between these stress and atomic slip in thin film is analyzed. |
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