Journal
PLOS ONE
Volume 10, Issue 7, Pages -Publisher
PUBLIC LIBRARY SCIENCE
DOI: 10.1371/journal.pone.0131886
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Funding
- National Natural Science Foundation of China [51222504, 51275114, 51405106]
- Author of National Excellent Doctoral Dissertation of PR China [201031]
- Program for New Century Excellent Talents in University [NCET-11-0812]
- China Postdoctoral Science Foundation [2012M511463, 2013T60358]
- Heilongjiang Postdoctoral Fund [LBH-Z11143]
- National Program for Support of Top-notch Young Professors
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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.
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