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Observation and analysis of extended dislocations in an Al–Pd–Mn icosahedral quasicrystal by transmission electron microscopy

Published online by Cambridge University Press:  03 March 2011

Jianglin Feng ,
Renhui Wang  and
Mingxing Dai
Jianglin Feng
Affiliation:
Department of Physics, Wuhan University, 430072 Wuhan, and Beijing Laboratory of Electron Microscopy, Chinese Academy of Sciences, 100080 Beijing, P.O. Box 2724, People's Republic of China
Renhui Wang
Affiliation:
Department of Physics, Wuhan University, 430072 Wuhan, and Beijing Laboratory of Electron Microscopy, Chinese Academy of Sciences, 100080 Beijing, P.O. Box 2724, People's Republic of China
Mingxing Dai
Affiliation:
Department of Physics, Wuhan University, 430072 Wuhan, and Beijing Laboratory of Electron Microscopy, Chinese Academy of Sciences, 100080 Beijing, P.O. Box 2724, People's Republic of China
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Abstract

Extended dislocations including partial dislocations and a stacking fault in Al70Pd20Mn10 icosahedral quasicrystal have been observed and identified for the first time. The diffraction contrast and defocus convergent-beam electron diffraction experiments show that the dissociation of the extended dislocations is of the form 1/2<1 −2 0 0 −2 1> → 1/4<1 −3 1 −1 −1 1>+ 1/4<1 −1 −1 1 −xs3 1> with a stacking fault between these two partial dislocations. For the partial dislocations, the Burgers vector components in physical space bpart are along different fivefold axes with a magnitude of 0.17 nm, which is about one seventh of that in complementary space. For the perfect dislocation, the Burgers vector component in physical subspace bperf is along a twofold axis with a magnitude of 0.183 nm, which is about an eleventh of that in complementary space.

Type
Articles
Information
Journal of Materials Research , Volume 10 , Issue 11 , November 1995 , pp. 2742 - 2748
Copyright
Copyright © Materials Research Society 1995

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References

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