M. Doblinger et al., Metastable transformation states of decagonal Al-Co-Ni due to inhibited decomposition - art. no. 134208, PHYS REV B, 6413(13), 2001, pp. 4208
The transformation behavior of high-Co decagonal AI-Co-Ni is studied. Start
ing from stability considerations based on a number of annealing treatments
we check theoretical predictions of the stabilization mechanism and transf
ormation mechanism by phason strain analysis and tiling analysis. The quasi
crystal transforms in the first stages into nanodomain structures and final
ly decomposes into a quasicrystal and a normal crystalline phase. Before de
composition, the material is locked in a disordered state exceeding the per
iodic order allowed for a one-dimensional quasicrystal. This is interpreted
as the maximum periodic order achievable without diffusion. From consideri
ng different reasons for phason strain we conclude that disorder in tilings
related to phase transformations can wrongly be associated with that sugge
sted by the random tiling hypothesis.