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Experimental and Theoretical Investigation of Crystallographic Orientation Dependence of Nanoscratching of Single Crystalline Copper.

Geng Y, Zhang J, Yan Y, Yu B, Geng L, Sun T - PLoS ONE (2015)

Bottom Line: The correlation of microscopic deformation behavior of the material with macroscopically-observed machining results is revealed.Moreover, the influence of crystallographic orientation on the nanoscratching of single crystalline copper is examined.Both experiments and MD simulations demonstrate that the machined surface morphologies in terms of groove depth and surface pile-up exhibit strong crystallographic orientation dependence, because of different geometries of activated slip planes cutting with free surfaces and strain hardening abilities associated with different crystallographic orientations.

View Article: PubMed Central - PubMed

Affiliation: The State Key Laboratory of Robotics and Systems, Robotics Institute, Harbin Institute of Technology, Harbin, Heilongjiang, 150008, P. R. China; Center for Precision Engineering, Harbin Institute of Technology, Harbin, Heilongjiang, 150001, P. R. China.

ABSTRACT
In the present work, we perform experiments and molecular dynamics simulations to elucidate the underlying deformation mechanisms of single crystalline copper under the load-controlled multi-passes nanoscratching using a triangular pyramidal probe. The correlation of microscopic deformation behavior of the material with macroscopically-observed machining results is revealed. Moreover, the influence of crystallographic orientation on the nanoscratching of single crystalline copper is examined. Our simulation results indicate that the plastic deformation of single crystalline Cu under the nanoscratching is exclusively governed by dislocation mechanisms. However, there is no glissile dislocation structure formed due to the probe oscillation under the load-controlled mode. Both experiments and MD simulations demonstrate that the machined surface morphologies in terms of groove depth and surface pile-up exhibit strong crystallographic orientation dependence, because of different geometries of activated slip planes cutting with free surfaces and strain hardening abilities associated with different crystallographic orientations.

No MeSH data available.


Related in: MedlinePlus

MD snapshots of inclined probe after multi-pass nanoscratching of single crystalline Cu samples.Crystallographic orientations of (a) (010), (b) (110) and (c) (111). Atoms are colored according to their atomic displacement magnitudes.
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pone.0131886.g011: MD snapshots of inclined probe after multi-pass nanoscratching of single crystalline Cu samples.Crystallographic orientations of (a) (010), (b) (110) and (c) (111). Atoms are colored according to their atomic displacement magnitudes.

Mentions: Fig 11(A), 11(B) and 11(C) present the inclination of the probe after multi-passes nanoscratching of the Cu(010), Cu(110) and Cu(111), respectively. It is found from Fig 11 that the displacement of the probe for the Cu(010) is significantly larger than the Cu(110) and Cu(111). For the Cu(100), the inclination of the probe is resulted by the lateral displacement of the bottom part and the radial rotation of upper part of the probe. For either the Cu(110) or Cu(111), however, the lateral displacement dominates the inclination of the probe.


Experimental and Theoretical Investigation of Crystallographic Orientation Dependence of Nanoscratching of Single Crystalline Copper.

Geng Y, Zhang J, Yan Y, Yu B, Geng L, Sun T - PLoS ONE (2015)

MD snapshots of inclined probe after multi-pass nanoscratching of single crystalline Cu samples.Crystallographic orientations of (a) (010), (b) (110) and (c) (111). Atoms are colored according to their atomic displacement magnitudes.
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4492598&req=5

pone.0131886.g011: MD snapshots of inclined probe after multi-pass nanoscratching of single crystalline Cu samples.Crystallographic orientations of (a) (010), (b) (110) and (c) (111). Atoms are colored according to their atomic displacement magnitudes.
Mentions: Fig 11(A), 11(B) and 11(C) present the inclination of the probe after multi-passes nanoscratching of the Cu(010), Cu(110) and Cu(111), respectively. It is found from Fig 11 that the displacement of the probe for the Cu(010) is significantly larger than the Cu(110) and Cu(111). For the Cu(100), the inclination of the probe is resulted by the lateral displacement of the bottom part and the radial rotation of upper part of the probe. For either the Cu(110) or Cu(111), however, the lateral displacement dominates the inclination of the probe.

Bottom Line: The correlation of microscopic deformation behavior of the material with macroscopically-observed machining results is revealed.Moreover, the influence of crystallographic orientation on the nanoscratching of single crystalline copper is examined.Both experiments and MD simulations demonstrate that the machined surface morphologies in terms of groove depth and surface pile-up exhibit strong crystallographic orientation dependence, because of different geometries of activated slip planes cutting with free surfaces and strain hardening abilities associated with different crystallographic orientations.

View Article: PubMed Central - PubMed

Affiliation: The State Key Laboratory of Robotics and Systems, Robotics Institute, Harbin Institute of Technology, Harbin, Heilongjiang, 150008, P. R. China; Center for Precision Engineering, Harbin Institute of Technology, Harbin, Heilongjiang, 150001, P. R. China.

ABSTRACT
In the present work, we perform experiments and molecular dynamics simulations to elucidate the underlying deformation mechanisms of single crystalline copper under the load-controlled multi-passes nanoscratching using a triangular pyramidal probe. The correlation of microscopic deformation behavior of the material with macroscopically-observed machining results is revealed. Moreover, the influence of crystallographic orientation on the nanoscratching of single crystalline copper is examined. Our simulation results indicate that the plastic deformation of single crystalline Cu under the nanoscratching is exclusively governed by dislocation mechanisms. However, there is no glissile dislocation structure formed due to the probe oscillation under the load-controlled mode. Both experiments and MD simulations demonstrate that the machined surface morphologies in terms of groove depth and surface pile-up exhibit strong crystallographic orientation dependence, because of different geometries of activated slip planes cutting with free surfaces and strain hardening abilities associated with different crystallographic orientations.

No MeSH data available.


Related in: MedlinePlus