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Plastic Deformation of Approximants: Dislocations vs. Phason Lines

Published online by Cambridge University Press:  10 February 2011

H. Klein ,
M. Feuerbacher ,
P. Schall  and
K. Urban
H. Klein
Affiliation:
IFF/IMF, Forschungszentrum Jilich, 52425 J¨lich, Germany
M. Feuerbacher
Affiliation:
IFF/IMF, Forschungszentrum Jilich, 52425 J¨lich, Germany
P. Schall
Affiliation:
IFF/IMF, Forschungszentrum Jilich, 52425 J¨lich, Germany
K. Urban
Affiliation:
IFF/IMF, Forschungszentrum Jilich, 52425 J¨lich, Germany
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Abstract

Deformation experiments were performed on single crystals of the ξ-AIPdMn approximant in bending geometry at high temperature. Two different mechanisms of plastic deformation are shown to exist in this phase: one based on dislocations and another novel mechanism based on the motion of phason lines. Burgers vector and line directions of dislocations were determined. Phason lines are shown to build a periodic lattice. The interaction of a dislocation with the phason line lattice results in dislocations on another length scale. This meta-dislocation in the periodic phason line lattice has a Burgers vector of magnitude 165 Å. The relative importance of phason lines and dislocations for the plastic deformation is discussed as a function of the orientation of the sample with respect to the bending geometry.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 553: Symposium LL – Quasicrystals , 1998 , 325
Copyright
Copyright © Materials Research Society 1999

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References

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