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Nanotechnikum |
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Martin-Luther-Universität
Interdisziplinäres Zentrum für Materialwissenschaften
Nanotechnikum Weinberg
Heinrich-Damerow-Str. 4, D-06120 Halle, Germany
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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.
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