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Formation, microstructure, chemical long-range order, and stability of quasicrystals in Al–Pd–Mn alloys

Published online by Cambridge University Press:  31 January 2011

An-Pang Tsai
Affiliation:
Institute for Materials Research, Tohoku University, 980 Sendai, Japan
Yoshihiko Yokoyama
Affiliation:
Graduate School, Tohoku University, 980 Sendai, Japan
Akihisa Inoue
Affiliation:
Institute for Materials Research, Tohoku University, 980 Sendai, Japan
Tsuyoshi Masumoto
Affiliation:
Institute for Materials Research, Tohoku University, 980 Sendai, Japan
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Abstract

The icosahedral (i-) phases are found over a wide composition range in melt-quenched Al–Pd–Mn alloys. The i-phase has a simple icosahedral lattice in the low Pd content region (Pd <10 at. %) and transforms to a face-centered icosahedral with increasing Pd content (Pd >10 at. %). A decagonal phase with a periodicity of 1.6 nm exists at a low Mn content region. On the basis of the change in diffraction peak intensity, it was presumed that the chemical ordering between Al and Pd exists in a face-centered icosahedral lattice in which Pd and Mn occupy one superlattice site and Al occupies the other one. A dendritic growth morphology in a mixed structure containing i- and fcc Al phases changes to a planar growth morphology in a fully single i-phase. An interpretation of dependence of morphology on composition is given in terms of the interface stability criterion using a metastable i–Al phase diagram.

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Articles
Copyright
Copyright © Materials Research Society 1991

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