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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

Incipient plasticity during the direct imprint of Al(010) and Al(111). Defect structures of (a) Al(010) and (b) Al(111).
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Fig7: Incipient plasticity during the direct imprint of Al(010) and Al(111). Defect structures of (a) Al(010) and (b) Al(111).

Mentions: Figure 7a,b presents the instantaneous defect structures at the onset of plasticity of Al(010) and Al(111), respectively. Dynamic inspection of defect evolution shows that the yielding of each substrate is governed by heterogeneous nucleation of dislocations from the imprinted surface, as the {111} slip planes are activated sequentially. It is seen from Figure 7 that there are three and two slip planes activated at the onset of plasticity of the Al(010) and Al(111) orientations, respectively. Moreover, while the activated slip planes have no preferable directions for different teeth, the slip planes for the (111) orientation is the same, as one is 73° inclined and the other is parallel to the (111) free surface. It is well known that there are four {111} slip planes for dislocation motions in FCC crystals. However, the geometry between individual slip planes and imprinted surfaces is different for different orientations, which consequently leads to different material removal behavior.Figure 7


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)

Incipient plasticity during the direct imprint of Al(010) and Al(111). Defect structures of (a) Al(010) and (b) Al(111).
© Copyright Policy - open-access
Related In: Results  -  Collection

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

Fig7: Incipient plasticity during the direct imprint of Al(010) and Al(111). Defect structures of (a) Al(010) and (b) Al(111).
Mentions: Figure 7a,b presents the instantaneous defect structures at the onset of plasticity of Al(010) and Al(111), respectively. Dynamic inspection of defect evolution shows that the yielding of each substrate is governed by heterogeneous nucleation of dislocations from the imprinted surface, as the {111} slip planes are activated sequentially. It is seen from Figure 7 that there are three and two slip planes activated at the onset of plasticity of the Al(010) and Al(111) orientations, respectively. Moreover, while the activated slip planes have no preferable directions for different teeth, the slip planes for the (111) orientation is the same, as one is 73° inclined and the other is parallel to the (111) free surface. It is well known that there are four {111} slip planes for dislocation motions in FCC crystals. However, the geometry between individual slip planes and imprinted surfaces is different for different orientations, which consequently leads to different material removal behavior.Figure 7

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