Abstract
Abstract T2 phase within αAlTe2 eutectic dendrites in chill-cast Al—15 wt% Li—6 wt% Cu alloy exhibits distortion from the ideal icosahedral pattern consistent with formation of growth twins with a common fivefold axis. Similar displacements are observed for primary T2 in Al—Li—Cu and for icosahedral phases in rapidly solidified Al—Mn and Al—Fe—Cu. The correlated nature of the observed reciprocal lattice displacements and the long range lattice displacements suggest that the defects are a true reflection of the state of the material rather than an artefact generated by specimen preparation.
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