https://doi.org/10.1051/epjap:1999237
Pop-in phenomenon during nanoindentation in MgO
Laboratoire de Métallurgie Physique (UMR 6630 du CNRS), Université de Poitiers, UFR Sciences,
bâtiment SP2MI-Bd 3, Téléport 2,
B.P. 179, 86960 Futuroscope Cedex, France
Corresponding author: Christophe.tromas@lmp.univ-poitiers.fr
Received:
21
January
1999
Revised:
2
September
1999
Accepted:
2
September
1999
Published online: 15 September 1999
During nanoindentation of MgO, a pop-in phenomenon has been observed, that is, an abrupt increase in penetration depth at a critical load. Atomic force microscopy investigations have been performed to characterise the dislocation structure in the vicinity of the indented area. The pop-in has been found to be the first stage of plastic deformation during nanoindentation. This phenomenon is ascribed to the nucleation and further propagation of interstitial loops of dislocations beneath the indenter. A three-dimensional model for a flat ended indenter is developed.
PACS: 62.20.Fe – Deformation and plasticity (including yield, ductility, and superplasticity) / 61.72.Hh – Indirect evidence of dislocations and other defects (resistivity, slip, creep, strains, internal friction, EPR, NMR, etc.) / 68.35.Gy – Mechanical and acoustical properties; adhesion
© EDP Sciences, 1999
