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Metadislocations: The case of pure glide

Published online by Cambridge University Press:  15 January 2013

Marc Heggen  and
Michael Feuerbacher
Marc Heggen
Affiliation:
Forschungszentrum Jülich GmbH, 52425 Jülich, Germany
Michael Feuerbacher
Affiliation:
Forschungszentrum Jülich GmbH, 52425 Jülich, Germany
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Abstract

Metadislocations are highly complex and pivotal defects mediating plastic deformation in complex metallic alloys. Here, we review recent results on the structure of metadislocations in the phases T-Al-Mn-Pd, T-Al-Mn-Fe and o-Al13Co4. In these materials, metadislocation motion is of particular interest as it takes place by pure glide in contrast to most other complex metallic alloys. Recently, novel metadislocations were found in the T-phase [1]. They have Burgers vectors ${\rm{\vec b}} = \pm \tau ^{ - n} c\left( {\matrix{ 0 & 0 & 1 \cr } } \right)$ (n = 2, 3, 4) and are associated to two, four and six planar defects, respectively. The type of planar defect depends on the deformation geometry. Metadislocation glide creates (1 0 0) stacking faults and climb creates (0 0 1) phason planes. Metadislocation glide was observed in the o-Al13Co4 phase, as well [2]. The close structural relation of metadislocations in the phases T-Al-Mn-Pd, T-Al-Mn-Fe, Al13Co4 and ε6-Al-Pd-Mn is discussed.

Keywords

quasicrystaltransmission electron microscopy (TEM)defects
Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1517: Symposium KK – Complex Metallic Alloys , 2013 , mrsf12-1517-kk04-01
Copyright
Copyright © Materials Research Society 2013

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