Pop-in phenomenon during nanoindentation in MgO

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 fo...

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Veröffentlicht in:	European physical journal. Applied physics 1999-09, Vol.8 (2), p.123-128
Hauptverfasser:	Tromas, C., Colin, J., Coupeau, C., Girard, J. C., Woirgard, J., Grilhé, J.
Format:	Artikel
Sprache:	eng
Schlagworte:	61.72.Hh 62.20.Fe 68.35.Gy Condensed matter: structure, mechanical and thermal properties Deformation and plasticity (including yield, ductility, and superplasticity) Exact sciences and technology Mechanical and acoustical properties of condensed matter Mechanical properties of solids Physics
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Beschreibung
Zusammenfassung:	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.
ISSN:	1286-0042 1286-0050
DOI:	10.1051/epjap:1999237