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Abstract
A model for the formation of modulated structures frequently observed in icosahedral alloys of the Al[sbnd]Cu[sbnd]Fe type and representing an intermediate phase at the icosahedral phase-crystalline approximant transition is proposed. An assumption that this structural modulation may be due to a weak decagonality of the icosahedral phase is advanced. In our model, two different types of modulated structure can be distinguished. Such a decagonality originating both from phason strains and from a probable anisotropy of icosahedral shells has been considered.