Extrusion formation mechanism on silicon surface under the silica cluster impact studied by molecular dynamics simulation
Extrusion formation mechanism on silicon surface under the silica cluster impact studied by molecular dynamics simulation
复制标题
分子动力学模拟研究硅簇撞击下硅表面挤压形成机制
DOI:
10.1063/1.3021458
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发表时间:
2008-11
影响因子:
3.2
通讯作者:
Guo D
中科院分区:
文献类型:
--
作者:
Luo JB;Lu XC;Chen RL;Guo D
Molecular dynamic simulation is applied in analyzing the deformation of silicon surface under the impact of large silica cluster. The mechanism of such a deformation is largely different from the cases of ion bombardment and indentation. With the impact of large silica cluster, the silicon surface is extruded due to the combinational effects of thermal spread, phase transformation, and crystallographic slip. It is found that thermal spread is the most significant one among these three effects. The extrusions on silicon surface will be in embryo during the impact unloading stage and will grow up during the cluster rebounding stage. Furthermore, the critical impact velocity to induce the formation of extrusions on silicon surface is associated with the incidence angle of the cluster, while it is independent from the size of the cluster. The findings are instructive in optimizing the process parameters for ultraprecision machining of silicon wafer.
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发表时间:
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影响因子:
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