A series of alloys (Al60Mn11Ni4, Al76Mn15.5Cu8.5, Al65Mn15Cu20, Al24Mn5Zn and Al12Mn2.9Zn) have been prepared in as-cast and rapidly solidified conditions. The occurrence of icosahedral and decagonal quasi-crystalline phases as well as rational approximants to the decagonal phase has been established by electron microscopy. This comparative study highlights the similarities and differences among the closely related crystalline phases serving as rational approximants to the decagonal phase in the three systems AlMnNi, AlMnCu and AlMnZn. Structural features as well as the propensity for twinning of the crystals have been characterized. © 1994.
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