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Direct observations of incipient plasticity during nanoindentation of Al

Published online by Cambridge University Press:  03 March 2011

A.M. Minor ,
E.T. Lilleodden ,
E.A. Stach  and
J.W. Morris Jr.
A.M. Minor
Affiliation:
Materials Science Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720
E.T. Lilleodden
Affiliation:
Materials Science Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720
E.A. Stach
Affiliation:
National Center for Electron Microscopy, Lawrence Berkeley National Laboratory, Berkeley, California 94720
J.W. Morris Jr.
Affiliation:
Materials Science Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, and Department of Materials Science and Engineering, University of California, Berkeley, California 94720
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Abstract

The mechanical testing technique for in situ nanoindentation in a transmission electron microscope is described and is shown to provide real-time observations of the mechanisms of plastic deformation that occur during nanoindentation. Here, the importance of this technique was demonstrated on an aluminum thin film deposited on a single-crystalline silicon substrate. Significant results include direct observation of dislocation nucleation, characterization of the dislocation distribution created by indentation, and the observation of indentation-induced grain boundary motion. The observations achieved by this technique provide unique insight into mechanical behavior studied with conventional instrumented nanoindentation techniques and also provide microstructural-level understanding of the mechanics of ultrasmall volumes.

Keywords

NanoindentationDislocationsThin film
Type
Articles
Information
Journal of Materials Research , Volume 19 , Issue 1 , January 2004 , pp. 176 - 182
Copyright
Copyright © Materials Research Society 2004

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