Investigation of indentation-, impact- and scratch-induced mechanically affected zones in a copper single crystal
Résumé
Many nanomechanical testings and surface mechanical treatments—burnishing, shot peening...—are based upon contact phenomena such as indentation, impact and scratch loadings. In this paper, the Mechanically Affected Zone (MAZ) induced by these standard contact loadings applied on a single crystal copper is investigated. We assume that the MAZ can be characterized by the lattice misorientation measured using backscattering electron diffraction. With the help of a Finite-Element analysis, it is shown that crystal plasticity theory can estimate with enough accuracy the lattice misorientation pattern. Experimental results highlight that the MAZ size is always related to the residual imprint dimension and its shape depends strongly on the kind of loading.
Mots clés
Indentation
Scratch
Micro-impact
EBSD
Crystal plasticity
Finite-element analysis
Surface mechanical treatment
Lattice misorientation
TRIBOLOGICALLY TRANSFORMED STRUCTURE
CENTERED-CUBIC CRYSTALS
STRESS-STRAIN CURVES
SHOT PEENING PROCESS
RESIDUAL-STRESSES
SURFACE INTEGRITY
HARDENED STEEL
PLASTICITY
METALS
DEFORMATION