Abstract
Plastic deformation of icosahedral AlCuFe has been studied by compression tests for temperatures ranging from room temperature to 750°C. Whereas at room temperature no ducibility is observed, the samples can be homogeneously deformed up to 130% at high temperatures with no final hardening stage. SEM observations reveal, at the ultimate stage of deformation, a vein pattern similar to the observed in amorphous metals but without slip bands or shear bands. Stress relaxation measurements shows to different regimes at low and high temperatures with a transition at 660°C. It is concluded from these experiments that dislocations are probably not responsible for the plastic deformation of icosahedral quasicrystals.
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