Dislocation Mechanisms and Plasticity of Quasicrystals: TEM Observations in Icosahedral AlPdMn

Daniel Caillard

doi:10.4028/www.scientific.net/MSF.509.49

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Microstructure and Self-Affine Fracture Surface Parameters in Steel
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Dislocation Mechanisms and Plasticity of Quasicrystals: TEM Observations in Icosahedral AlPdMn
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HomeMaterials Science ForumMaterials Science Forum Vol. 509Dislocation Mechanisms and Plasticity of...

Dislocation Mechanisms and Plasticity of Quasicrystals: TEM Observations in Icosahedral AlPdMn

Abstract:

Quasicrystals can deform Plastically at high temperatures by the movement of dislocations like in crystals. Little is known, however, on the mechanisms that control dislocation movements in these structures. In a first part, the crystallography of quasicrystals is introduced as the projection, in the physical space, of a periodic structure in a hyperspace with more than three dimensions (6 in the case of icosahedral structures). The main properties of dislocations are defined in the physical space and in the six-dimensional space. New results are then presented, showing that dislocation movements may have a large component of climb, in contrast with all existing models that are based on glide processes only. Dislocation movements in two-fold and five-fold planes are compared and discussed in connection with macroscopic mechanical properties.

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Materials Science Forum (Volume 509)

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49-56

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.509.49

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Online since:

March 2006

Authors:

Daniel Caillard

Keywords:

Al-Pd-Mn Alloys, Dislocation, Plasticity, Quasicrystal, TEM

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