Decagonal and decagonal approximant formation as a function of composition in ternary Al—Co—Cu alloys
- 1 January 1992
- journal article
- research article
- Published by Taylor & Francis in Philosophical Magazine Letters
- Vol. 65 (1) , 55-65
- https://doi.org/10.1080/09500839208215148
Abstract
As-cast alloy ingots of nominal compositions Al65Co20Cu15, A160Co20Cu20, Al65Co15Cu20, and Al70Co15Cu15 were studied with transmission electron microscopy and energy-dispersive X-ray spectroscopy. A compositional variation among the grains, in each alloy, allowed an examination of phase formation as a function of the ternary composition near the nominal compositions. Alloys of composition Al65Co20Cu15, often taken as a stable decagonal phase, instead form a large (about 100 Å) unit-cell crystal phase that approximates the decagonal phase. No decagonal phase forms near this composition. True decagonal phase formation is only observed in a narrow phase field centred near Al65Co15Cu20.Keywords
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