Abstract
In this paper, we investigate the residual deformation field in the vicinity of nanoscratch tests using two orientations of a Berkovich tip on an (001) Cu single crystal. We compare the deformation with that from indentation, in an attempt to understand the mechanisms of deformation in tangential sliding. The lattice rotation fields are mapped experimentally using high-resolution electron backscatter diffraction (HR-EBSD) on cross-sections prepared using focused ion beam (FIB). A physically-based crystal plasticity finite element model (CPFEM) is used to simulate the lattice rotation fields, and provide insight into the 3D rotation field surrounding a nano-scratch experiment, as it transitions from an initial static indentation to a steady-state scratch. The CPFEM simulations capture the experimental rotation fields with good fidelity, and show how the rotations about the scratch direction are reversed as the indenter moves away from the initial indentation.
Highlights
The extensive development of nanomechanical testing instruments has expanded the capabilities of nanoscale measurement beyond basic indentation hardness
We investigate the residual deformation field in the vicinity of nanoscratch tests using two orientations of a Berkovich tip on an (001) Cu single crystal
In order to interpret the differences measured in indentation and scratch hardness, it is important to develop a deeper understanding of the mechanics of nanoscratch formation
Summary
The extensive development of nanomechanical testing instruments has expanded the capabilities of nanoscale measurement beyond basic indentation hardness. By further incorporating the lateral force into the measurement, it is possible to obtain a scratch hardness measurement that is in closer agreement to the indentation hardness, on isotropic materials [21, 22]. This is not applicable to all Preprint submitted to Acta Materialia material classes, metallic samples that exhibit work hardening and anisotropy, as shown in [23, 24]. In order to interpret the differences measured in indentation and scratch hardness, it is important to develop a deeper understanding of the mechanics of nanoscratch formation
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