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Dislocation Dynamics in Icosahedral Al-Pd-Mn Single Quasicrystals

Published online by Cambridge University Press:  17 March 2011

Ulrich Messerschmidt ,
Martin Bartsch ,
Bert Geyer ,
Lars Ledig ,
Michael Feuerbacher ,
Markus Wollgarten  and
Knut Urban
Ulrich Messerschmidt
Affiliation:
Max-Planck-Institut für Mikrostrukturphysik, Weinberg 2, Halle(Saale), D-06120, Germany
Martin Bartsch
Affiliation:
Max-Planck-Institut für Mikrostrukturphysik, Weinberg 2, Halle(Saale), D-06120, Germany
Bert Geyer
Affiliation:
Max-Planck-Institut für Mikrostrukturphysik, Weinberg 2, Halle(Saale), D-06120, Germany
Lars Ledig
Affiliation:
Max-Planck-Institut für Mikrostrukturphysik, Weinberg 2, Halle(Saale), D-06120, Germany
Michael Feuerbacher
Affiliation:
Institut für Festkörperforschung, Forschungszentrum Jülich, Jülich, D-52425, Germany
Markus Wollgarten
Affiliation:
Institut für Festkörperforschung, Forschungszentrum Jülich, Jülich, D-52425, Germany
Knut Urban
Affiliation:
Institut für Festkörperforschung, Forschungszentrum Jülich, Jülich, D-52425, Germany
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Abstract

The paper reviews results from in situ straining experiments on Al-Pd-Mn single quasicrystals in a high-voltage electron microscope. Slip planes were determined from the orientation and width of slip traces. Dislocations are generated by a specific cross slip mechanism. On some slip traces, dislocations move at two distinctly different velocities. A stress exponent was determined on a single dislocation by observing its displacement under decreasing load. The in situexperiments reveal the behaviour of individual dislocations in a temperature range where the deformation of bulk specimens is strongly affected by recovery.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 643: Symposium K – Quasicrystals-Preparation, Properties, and Applications , 2000 , K6.5
Copyright
Copyright © Materials Research Society 2002

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References

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