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@ARTICLE{Roy:910734,
      author       = {Roy, Shyamal and Wille, Sönke and Mordehai, Dan and
                      Volkert, Cynthia A.},
      title        = {{I}nvestigating {N}anoscale {C}ontact {U}sing {AFM}-{B}ased
                      {I}ndentation and {M}olecular {D}ynamics {S}imulations},
      journal      = {Metals},
      volume       = {12},
      number       = {3},
      issn         = {2075-4701},
      address      = {Basel},
      publisher    = {MDPI},
      reportid     = {FZJ-2022-04104},
      pages        = {489 -},
      year         = {2022},
      abstract     = {In this work we study nanocontact plasticity in Au thin
                      films using an atomic force microscope based indentation
                      method with the goal of relating the changes in surface
                      morphology to the dislocations created by deformation. This
                      provides a rigorous test of our understanding of deformation
                      and dislocation mechanisms in small volumes. A series of
                      indentation experiments with increasing maximum load was
                      performed. Distinct elastic and plastic regimes were
                      identified in the force-displacement curves, and the
                      corresponding residual imprints were measured. Transmission
                      electron microscope based measured dislocation densities
                      appear to be smaller than the densities expected from the
                      measured residual indents. With the help of molecular
                      dynamics simulations we show that dislocation nucleation and
                      glide alone fail to explain the low dislocation density.
                      Increasing the temperature of the simulations accelerates
                      the rate of thermally activated processes and promotes
                      motion and annihilation of dislocations under the indent
                      while transferring material to the upper surface;
                      dislocation density decreases in the plastic zone and
                      material piles up around the indent. Finally, we discuss why
                      a significant number of cross-slip events is expected
                      beneath the indent under experimental conditions and the
                      implications of this for work hardening during wear.},
      cin          = {IAS-9},
      ddc          = {530},
      cid          = {I:(DE-Juel1)IAS-9-20201008},
      pnm          = {899 - ohne Topic (POF4-899)},
      pid          = {G:(DE-HGF)POF4-899},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000774163500001},
      doi          = {10.3390/met12030489},
      url          = {https://juser.fz-juelich.de/record/910734},
}