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The decagonal quasicrystal formed from an Al–Pd–Mn icosahedral quasicrystal

Published online by Cambridge University Press:  03 March 2011

W. Sun  and
K. Hiraga
W. Sun
Affiliation:
Institute for Materials Research, Tohoku University, Katahira, Aoba-ku, 980-77 Sendai, Japan
K. Hiraga
Affiliation:
Institute for Materials Research, Tohoku University, Katahira, Aoba-ku, 980-77 Sendai, Japan
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Abstract

We present a detailed investigation on the decagonal quasicrystal (D-phase) formed from an Al-Pd-Mn icosahedral quasicrystal (I-phase) through a solid-state phase transformation, including its formation, compositional and crystallographical relationships with the matrix I-phase, growth mode, and structural characteristics. The as-melt-spun Al70Pd20Mn10 alloy contains only I-phase. By annealing at 800 °C, the D-phase is found to grow cpitaxially from the I-phase to establish a D/I two-phase equilibrium with distinctly different composition between them. The D-phase exhibits a stepped growth interface, which consists of a facet plane, formed by sharing the tenfold plane with a fivefold plane of the matrix I-phase, and some ledges across it. The growth of the D-phase into the I-phase proceeds through lateral movement of the ledges along the tenfold plane. High-resolution electron microscopy reveals that the structure of the D-phase is constructed by an aperiodic arrangement of decagonal atom clusters with definite linkages and long-range quasiperiodic correlation.

Type
Articles
Information
Journal of Materials Research , Volume 10 , Issue 5 , May 1995 , pp. 1146 - 1153
Copyright
Copyright © Materials Research Society 1995

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