Al-Cu-Co single quasicrystals obtained by the method of inclined front crystallisation

An AI-Cu-Co alloy was obtained by the inclined front of crystallisation method (IFC). During crystallisation the alloy delaminated into three layers, two of which were single decagonal quasicrystals of different orientations and the third one was a mixture of two phases. The first quasicrystalline layer was formed in a peritectic reaction of an earlier created single crystalline layer of an approximant (phase of the B2 structure), the second - grew directly from liquid. With the use of Xray topography it was found that the (00001) planes of both quasicrystals are rotated of about 10 against each other.