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Three-dimensional visualization of dislocation-precipitate interactions in a Al–4Mg–0.3Sc alloy using weak-beam dark-field electron tomography

Published online by Cambridge University Press:  01 March 2011

G.S. Liu  and
I.M. Robertson
G.S. Liu
Affiliation:
Department of Materials Science and Engineering, University of Illinois at Urbana−Champaign, Urbana, Illinois 61801
I.M. Robertson*
Affiliation:
Department of Materials Science and Engineering, University of Illinois at Urbana−Champaign, Urbana, Illinois 61801
*
a)Address all correspondence to this author. e-mail: [email protected]
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Abstract

Weak-beam dark-field images of dislocations interacting with particles acquired over a large angular range were used to reconstruct tomograms, which were then used as the basis to construct a three-dimensional (3D) model of the dislocation structure. These capabilities facilitate viewing the dislocation structure from different directions, recovering the information lost in the electron beam direction. Coupling these capabilities and a method to include the specimen coordinate system within them with conventional dislocation analysis enables a full characterization of the dislocation microstructure in three dimensions. This approach is used to understand the 3D nature of the interaction of dislocations and a twist boundary with Al3Sc particles in an Al–Mg–Sc alloy.

Keywords

DislocationsTransmission electron microscopyAl
Type
Articles
Information
Journal of Materials Research , Volume 26 , Issue 4 , 28 February 2011 , pp. 514 - 522
Copyright
Copyright © Materials Research Society 2011

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Footnotes

b)

This author was an editor of this journal during the review and decision stage. For the JMR policy on review and publication of manuscripts authored by editors, please refer to http://www.mrs.org/jmr_policy.

References

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