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Growth and structure of Al-Cu-Co single quasi-crystals.

Bogdanowicz W.

Archives of Materials Science

2005

Vol. 26, nr 3

149-194

One- and two-subgrain single quasi-crystals of Al-Cu-Co alloy were obtained by the modification of inclined front crystallization (IFC) method. A model of transition layer has been suggested, which enabled the determination of the quantitative relation between parameters of single quasi-crystals subgrains and components of the inclined front crystallisation angle and the growth rate. On the basis of a transition layer model of two-subgrain single quasicrystals a method was prepared to determine thermal supercooling on the front of decagonal phase growing from the molten phase and its dependence on the growth rate. The mechanism of single quasi-crystals of Al-Cu-Co alloy has been found to change at the growth rate of around 0.25 mm/min. It has been determined that low-angle boundaries generate phasonic defects, which may propagate along a tenfold symmetry axis. The presence of subgrain boundaries in single quai-crystals increases the phasons concetration in them.

Plasticity of quasicrystalline alloys and their crystalline intermetallic approximants.

Urban K., Feuerbacher M., Klein H.

Inżynieria Materiałowa

2001

R. XXII, nr 5

931-934

An overview is given on the microscopic and macroscopic aspects of the plasticity of quasicrystals and their normalcrystalline approximants. Particular emphasis is laid on icosahedral Al-Pd-Mn and xi' Al-Pd-Mn serving as reference materials. Both materials deform involving dislocation mechanisms. However, in the case of xi' Al-Pd-Mn a combination of partial dislocations and shear-fault lines produces a novel type of defect termed metadislocation.