Aluminium-based quasicrystals have properties of great interest for many applications, e.g. hard coatings^[1], but are rather difficult to produce in large quantities, as they are stable only within a narrow composition domain^{[2, 3]}.
Alloy powder with nominal composition Al₆₇Cu₂₃Fe₁₀ was prepared by ball-milling of elemental metallic powders. The as-milled powder consists mainly of a nanocrystalline Al(Cu,Fe) solid solution.
The structural phase transitions upon heating under different pressures were investigated by in-situ X-ray diffraction at the F2.1 beamline of DESY-HASYLAB (Hamburg, Germany)^[4], in order to establish a PRESSURE-TEMPERATURE phase diagram. A single-phase quasicrystalline powder was obtained after a sequence of phase transitions taking place at temperatures between 250-300C and 700-800C, with phase transition temperatures varying with pressure. The quasicrystalline phase was shown to be stable after quenching under pressure.

References:
[1] S.M. Lee, E. Fleury, J.S. Kim, Y.C. Kim, D.H. Kim, W.T. Kim, H.S. Ahn, Potential industrial applications of Al-based quasicrystals: plasma-sprayed vs. HVOF sprayed coatings, Material Research Society Symposium Proceedings 643 (2001)
[2] M. Quiquandon, A. Quivy, J. Devaud, F. Faudot, S. Lefebvre, M. Bessire, Y. Calvayrac, Quasicrystal and approximant structures in the Al-Cu-Fe system, Journal of Physics: Condensed Matter 8 (1996) 2487-2512
[3] S.D. Kaloshkin, V.V. Tcherdyntsev, A.I. Salimon, I.A. Tomilin, T. Spataru, G. Principi, Mössbauer and X-ray diffraction study of the phase and structure transformations during annealing of mechanically alloyed Al65Cu23Fe12, Hyperfine Interactions 139/140 (2002) 399-405.
[4] F. Turquier, V.D. Cojocaru, R. Nicula, M.Stir, C. Lathe, E.Burkel, Pressure-assisted synthesis of Al-Cu-Fe quasicrystals, HASYLAB Annual Report 2003.

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