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Constitutive model of quasicrystal plasticity: Strain-rate and temperature dependence

Published online by Cambridge University Press:  01 February 2011

Marc Heggen  and
Michael Feuerbacher
Marc Heggen
Affiliation:
Institut für Festkörperforschung, Forschungszentrum Jülich GmbH, D-52425 Jülich, Germany
Michael Feuerbacher
Affiliation:
Institut für Festkörperforschung, Forschungszentrum Jülich GmbH, D-52425 Jülich, Germany
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Abstract

A constitutive model describing the plasticity of icosahedral quasicrystals [1] was applied to icosahedral Al-Pd-Mn over a wide range of experimental deformation conditions. The model incorporates the evolution of two microstructural parameters: The first, as in crystals, is the dislocation density; the second is a quasicrystal-specific order parameter that accounts for deformation-induced disordering and thermally activated reordering of the quasicrystal structure. Significant strain-rate dependence was found which can be understood by the interactive evolution of these two microstructural parameters. The present work shows that the constitutive model comprehensively describes the features of quasicrystal plasticity over a wide range of experimental conditions.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 805: Symposium LL – Quasicrystals , 2003 , LL5.1
Copyright
Copyright © Materials Research Society 2004

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References

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