Abstract
A melt-spun AlMnCrSi alloy with icosahedral quasicrystalline (i-QC) particles in the aluminium (Al) matrix has been investigated. The microstructure has been studied by means of transmission electron microscopy (TEM). Three orientation relationships between the i-QC and Al have been found in this alloy. It is also found that the precipitates have strong coherency relations with the aluminium matrix. High-resolution micrographs show that the i-QC phase locally exhibits large deviations from the ideal icosahedral symmetry, and coherency strain at the interface is observed. Even though there are no generally accepted rules for the description of dislocations in such structures, the appearance of extra planes is sometimes apparent in the strain area.
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