Interdisziplinäres Zentrum für Materialwissenschaften
  Publikationen [suche]   
Organisation
Aktivitäten
Kontakt
Angebote für Studenten
Bereiche im
      Nanotechnikum
Martin-Luther-Universität
Interdisziplinäres Zentrum für Materialwissenschaften
Nanotechnikum Weinberg
Heinrich-Damerow-Str. 4,
D-06120 Halle, Germany
Tel.: +49 345 55 28471
Telefax:+49 345 55 27390 email: info@cmat.uni-halle.de
[Veröffentlichungen] [Graduierungsarbeiten] [Berichte] [Poster]
Abstracts

D. Lorenz, A. Zeckzer, U. Hilpert, P. Grau, H. Johansen, H. S. Leipner
Pop-in effect as homogeneous nucleation of dislocations during nanoindentation
Virt. J. Nanoscale Sci. Technol. 7, 20 (2003),

Using advanced depth-sensitive hardness measurements, the homogenous nucleation of dislocations has been observed in dislocation-free single crystals. This process is related to a sudden displacement jump in the force-displacement curve. The mechanical stress for the set-in of this pop-in effect has been estimated with the Hertzian elastic contact theory. Experimental results of dislocation loop nucleation show good agreement with the continuum theory of dislocations. Electron microscopy provides a direct proof of dislocation nucleation during nanoindentation. PACS: 61.72.Lk, 81.40.Lm

Keywords: dislocations; sources; indentation; deformation; gallium arsenide; hardness; loops
Virtual J. Nanoscale Sci. Technol.

Impressum Copyright © Center of Materials Science, Halle, Germany. All rights reserved.