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Low Temperature Plastic Behaviour of Icosahedral AlCuFe Quasicrystals

Published online by Cambridge University Press:  17 March 2011

Jan Fikar ,
Joël Bonneville ,
Jacques Rabier ,
Nadine Baluc ,
Anne Proult ,
Patrick Cordier  and
Iona Stretton
Jan Fikar
Affiliation:
Ecole Polytechnique Fédérale de Lausanne, DP, CH-1015 Lausanne, SWITZERLAND
Joël Bonneville
Affiliation:
Université de Poitiers, LMP, UMR-CNRS 6630, SP2MI, BP 30179 F-86962 Chasseneuil Futuroscope Cedex, FRANCE
Jacques Rabier
Affiliation:
Université de Poitiers, LMP, UMR-CNRS 6630, SP2MI, BP 30179 F-86962 Chasseneuil Futuroscope Cedex, FRANCE
Nadine Baluc
Affiliation:
Fusion Technology Materials, CRPP - EPFL CH - 5232 Villigen PSI, SWITZERLAND
Anne Proult
Affiliation:
Université de Poitiers, LMP, UMR-CNRS 6630, SP2MI, BP 30179 F-86962 Chasseneuil Futuroscope Cedex, FRANCE
Patrick Cordier
Affiliation:
Université des Sciences et Techniques de Lille, LSPEA, ESA CNRS 8008, Bât. C6 F-59655 Villeneuve d'Ascq Cedex, FRANCE
Iona Stretton
Affiliation:
Bayerisches Geoinstitut (BGI), Universität Bayreuth D -95440, GERMANY
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Abstract

The mechanism by which dislocations move in the icosahedral quasicrystalline structure, i.e., glide or climb, is still an open question. In order to check whether pure dislocation glide occurs in this quasi-periodic structure, low temperature deformation tests have been performed under confining pressure conditions. These experimental techniques, which superimpose a shear stress on an isostatic component, enable the brittle-to-ductile transition temperature to be shifted to temperatures at which diffusion processes can be assumed to be negligible. Such techniques have been applied to deform plastically AlCuFe poly-quasicrystals at low and intermediate temperatures, using both gas and solid-confining media. Mechanical data as well as microstructural observations associated with this low temperature deformation range are reported. The first results provide new insights into the deformation mechanisms that control plasticity in the icosahedral quasicrystalline phase.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 643: Symposium K – Quasicrystals-Preparation, Properties, and Applications , 2000 , K7.4
Copyright
Copyright © Materials Research Society 2002

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