Growth-induced phason strains in icosahedral quasicrystals of Al-Li-Cu

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Abstract
Growth-induced phason strains have been examined by x-ray diffraction in icosahedral quasicrystals of Al-Li-Cu produced by various growth techniques. We find that the amplitudes of peak position shifts indicative of phason strains are about 7 times larger in the melt-spun ribbons as compared with the Bridgman-grown icosahedral crystals and increase logarithmically with growth velocity. The line shapes vary systematically reflecting the growth-induced microstructures. In contrast, the intrinsic peak broadening is very similar for all samples regardless of the growth condition.