Abstract
Self-diffusion of 57Co in decagonal Al–Ni–Co single quasicrystals was studied for both principal directions as a function of the temperature by means of the radiotracer method. In combination with serial sectioning, diffusivities were measured over a large temperature range from 732 to 1273K. Below about 1120K diffusion is described by an Arrhenius behaviour along both the periodic and the quasiperiodic directions. The magnitude of the activation enthalpies and pre-exponential factors support a vacancy-type diffusion mechanism. A small anisotropy of diffusion which is temperature-dependent but never exceeds 30% was detected. Above 1120K, a kink in the Arrhenius curve is observed. We attribute this behaviour to a phase transition from the decagonal basic Co-rich phase to an ordered modification.
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