Crystallographic orientation-dependent pattern replication in direct imprint of aluminum nanostructures

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• 作者：Ying Yuan (1)
  Junjie Zhang (1)
  Tao Sun (1)
  Cong Liu (2)
  Yanquan Geng (1)
  Yongda Yan (1)
  Peng Jin (2)
  
  1. Center for Precision Engineering ; Harbin Institute of Technology ; Harbin ; 150001 ; People鈥檚 Republic of China
  2. Center of Ultra-precision Optoelectronic Engineering ; Harbin Institute of Technology ; Harbin ; 150001 ; People鈥檚 Republic of China
  
• 关键词：Direct imprint ; Single ; crystalline aluminum ; Crystallographic orientation ; Nanoindentation ; Molecular dynamics
• 刊名：Nanoscale Research Letters
• 出版年：2015
• 出版时间：December 2015
• 年：2015
• 卷：10
• 期：1
• 全文大小：1,908 KB
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• 刊物主题：Nanotechnology; Nanotechnology and Microengineering; Nanoscale Science and Technology; Nanochemistry; Molecular Medicine;
• 出版者：Springer US
• ISSN：1556-276X

文摘

In the present work, we perform molecular dynamics simulations corroborated by experimental validations to elucidate the underlying deformation mechanisms of single-crystalline aluminum under direct imprint using a rigid silicon master. We investigate the influence of crystallographic orientation on the microscopic deformation behavior of the substrate materials and its correlation with the macroscopic pattern replications. Furthermore, the surface mechanical properties of the patterned structures are qualitatively characterized by nanoindentation tests. Our results reveal that dislocation slip and deformation twinning are two primary plastic deformation modes of single-crystalline aluminum under the direct imprint. However, both the competition between the individual deformation mechanisms and the geometry between activated dislocation slip systems and imprinted surface vary with surface orientation, which in turn leads to a strong crystallographic orientation dependence of the pattern replications. It is found that the (010) orientation leads to a better quality of pattern replication of single-crystalline aluminum than the (111) orientation.