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

Yuan Y, Zhang J, Sun T, Liu C, Geng Y, Yan Y, Jin P - Nanoscale Res Lett (2015)

Bottom Line: 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.It is found that the (010) orientation leads to a better quality of pattern replication of single-crystalline aluminum than the (111) orientation.

View Article: PubMed Central - PubMed

Affiliation: Center for Precision Engineering, Harbin Institute of Technology, Harbin, 150001 People's Republic of China.

ABSTRACT
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.

No MeSH data available.


Related in: MedlinePlus

Direct imprint results of Al(010) and Al(111). (a) Force-moving distance curves. Side views of patterned structures of (b) Al(010) and (c) Al(111).
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Fig6: Direct imprint results of Al(010) and Al(111). (a) Force-moving distance curves. Side views of patterned structures of (b) Al(010) and (c) Al(111).

Mentions: Figure 6a plots variations of the imprint force with moving distance during the direct imprint processes of the two aluminum substrates with different orientations, which demonstrates that the two curves show similar characteristics as described in ‘On the nature of direct imprint mechanisms’ section. However, there are still minor differences existing in the force variations. When the material is undergoing elastic deformation, the (111) orientation shows less compliant response than the (010) orientation because of larger Young’s modulus. The critical force associated with the initiation of plastic deformation is larger for the (111) orientation than that for the (010) orientation, and the corresponding force-drop phenomenon is also more pronounced. It is found from Figure 6 that the (111) orientation has bigger fluctuation of the force than the (010) orientation. Although the (111) orientation has larger maximum force at the largest moving distance, its residual imprint depth is smaller than the (010) orientation.Figure 6


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

Yuan Y, Zhang J, Sun T, Liu C, Geng Y, Yan Y, Jin P - Nanoscale Res Lett (2015)

Direct imprint results of Al(010) and Al(111). (a) Force-moving distance curves. Side views of patterned structures of (b) Al(010) and (c) Al(111).
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4385152&req=5

Fig6: Direct imprint results of Al(010) and Al(111). (a) Force-moving distance curves. Side views of patterned structures of (b) Al(010) and (c) Al(111).
Mentions: Figure 6a plots variations of the imprint force with moving distance during the direct imprint processes of the two aluminum substrates with different orientations, which demonstrates that the two curves show similar characteristics as described in ‘On the nature of direct imprint mechanisms’ section. However, there are still minor differences existing in the force variations. When the material is undergoing elastic deformation, the (111) orientation shows less compliant response than the (010) orientation because of larger Young’s modulus. The critical force associated with the initiation of plastic deformation is larger for the (111) orientation than that for the (010) orientation, and the corresponding force-drop phenomenon is also more pronounced. It is found from Figure 6 that the (111) orientation has bigger fluctuation of the force than the (010) orientation. Although the (111) orientation has larger maximum force at the largest moving distance, its residual imprint depth is smaller than the (010) orientation.Figure 6

Bottom Line: 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.It is found that the (010) orientation leads to a better quality of pattern replication of single-crystalline aluminum than the (111) orientation.

View Article: PubMed Central - PubMed

Affiliation: Center for Precision Engineering, Harbin Institute of Technology, Harbin, 150001 People's Republic of China.

ABSTRACT
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.

No MeSH data available.


Related in: MedlinePlus