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Direct Observations of Grain Boundary Phenomena during Indentation of Al and Al-Mg Thin Films

Published online by Cambridge University Press:  01 February 2011

W. A. Soer ,
J. Th. M. De Hosson ,
A. M. Minor ,
E. A. Stach  and
J. W. Morris Jr
W. A. Soer
Affiliation:
Dept. of Applied Physics, Netherlands Institute for Metals Research, University of Groningen, Groningen, The Netherlands
J. Th. M. De Hosson
Affiliation:
Dept. of Applied Physics, Netherlands Institute for Metals Research, University of Groningen, Groningen, The Netherlands
A. M. Minor
Affiliation:
Materials Science Division, Lawrence Berkeley National Laboratory, Berkeley, CA, USA
E. A. Stach
Affiliation:
National Center for Electron Microscopy, Lawrence Berkeley National Laboratory, Berkeley, CA, USA
J. W. Morris Jr
Affiliation:
Materials Science Division, Lawrence Berkeley National Laboratory, Berkeley, CA, USA Dept. of Materials Science and Engineering, University of California, Berkeley, CA, USA
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Abstract

The deformation behavior of Al and Al-Mg thin films has been studied with the unique experimental approach of in-situ nanoindentation in a transmission electron microscope. This paper concentrates on the role of solute Mg additions in the transfer of plasticity across grain boundaries. The investigated Al alloys were deposited onto a Si substrate as thin films with a thickness of 200–300 nm and Mg concentrations of 0, 1.1, 1.8, 2.6 and 5.0 wt% Mg. The results show that in the Al-Mg alloys, the solutes effectively pin high-angle grain boundaries, while in pure Al considerable grain boundary motion is observed at room temperature. The mobility of low-angle grain boundaries is however not affected by the presence of Mg. In addition, Mg was observed to affect dislocation dynamics in the matrix.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 795: Symposium U – Thin Films - Stresses and Mechanical Properties X , 2003 , U9.3
Copyright
Copyright © Materials Research Society 2004

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References

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