The system Al-Li-Cu has recently been found to form an icosahedral phase (Ball and Lloyd 1985). We have re-examined the phase diagram and X-ray data of Hardy and Silcock (1955). The powder X-ray pattern for their T2 phase can be indexed to an icosahedral structure with a quasilattice parameter of 5°02 Å. Previous work (Cherkashin, Kripyakevich and Oleksiv 1964) shows that the nearby R phase is an isotype of the (Al, Zn) 49Mg32 structure. The T2 phase appears to be a modification of the nearby R phase in close analogy with the relationship observed by Henley and Elser (1986) in Al-Mg-Zn alloys.
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Marcus et al. (1986) studied this question.
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