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High Temperature Plastic Behaviour of Icosahedral AlCuFe Quasicrystals.

Published online by Cambridge University Press:  17 March 2011

Jan Fikar ,
Joël Bonneville ,
Nadine Baluc  and
Pierre Guyot
Jan Fikar
Affiliation:
Université de Poitiers, LMP, UMR-CNRS 6630, SP2MI, F-86962 Futuroscope Cedex, FRANCE
Joël Bonneville
Affiliation:
Ecole Polytechnique Fédérale de Lausanne, DP, CH-1015 Lausanne, SWITZERLAND
Nadine Baluc
Affiliation:
Fusion Technology, CRPP-EPFL, CH-5232 Villigen PSI, SWITZERLAND
Pierre Guyot
Affiliation:
Institut National Polytechnique de Grenoble, UMR CNRS 5614, LTPCM, F-38042 St Martin d'Hères, FRANCE
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Abstract

Icosahedral AlCuFe poly-quasicrystalline specimens were deformed in constant strain rate compression tests at temperatures ranging between 300K - 1020K. Below nearly 0.7 Tm (Tm is the melting temperature) the specimens were brittle. Above the brittle-to-ductile transition temperature, after the elastic stage the stress-strain curves exhibit a marked yield-point followed by a stage of strain softening only. Transient creep tests were performed at different given stress/strain levels after interrupting the constant strain-rate deformation tests. After the transient tests, the flow strength of the specimens was investigated anew at constant strain rate. The results are interpreted in the framework of a dislocation model, where two effects opposing dislocation movement are considered: firstly, the usual elastic dislocation interaction, yielding a work-hardening contribution, and, secondly, a friction stress specific to the quasiperiodic lattice, leading to a softening effect.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 643: Symposium K – Quasicrystals-Preparation, Properties, and Applications , 2000 , K7.3
Copyright
Copyright © Materials Research Society 2002

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