J. Phys. Colloques
Volume 47, Numéro C3, Juillet 1986International Workshop on Aperiodic Crystals
|Page(s)||C3-457 - C3-464|
J. Phys. Colloques 47 (1986) C3-457-C3-464
DECAGONAL PHASEL. BENDERSKY1, 2
1 Center for Materials Research, The Johns Hopkins University, Baltimore, MD 21218, U.S.A.
2 Institute for Materials Science and Engineering, National Bureau of Standards, Gaithersburg, MD 20899, U.S.A.
Studies of phase formation in rapidly solidified Al-Mn alloys (composition range 18-22 at% Mn) show that an icosahedral phase is replaced by another noncrystallographic phase, a decagonal phase. The decagonal phase is another example of quasicrystal forming in Al-transition metal systems. It has a noncrystallographic point group (10/m or 10/mmm) together with long-range orientational and positional order and one-dimensional translational symmetry. The space group P105/m is suggested for the decagonal phase. Similarity and difference of Al-Mn and Al-Pd decagonal phases is discussed.