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Quasicrystalline phase formation in Al62Cu22.5Fe12.5 and Al55Cu22.5Fe12.5Be7 alloys

Published online by Cambridge University Press:  31 January 2011

S. M. Lee ,
B. H. Kim ,
D. H. Kim  and
W. T. Kim
S. M. Lee*
Affiliation:
Foundry Process Research Team, Korea Institute of Industrial Technology, 472 Kajwa 4-dong, Seo-ku, Inchon, 404-254, Korea
B. H. Kim
Affiliation:
Center for Noncrystalline Materials, Department of Metallurgical Engineering, Yonsei University, 134 Shinchon-dong, Seodaemun-ku, Seoul, 120-749, Korea
D. H. Kim
Affiliation:
Center for Noncrystalline Materials, Department of Metallurgical Engineering, Yonsei University, 134 Shinchon-dong, Seodaemun-ku, Seoul, 120-749, Korea
W. T. Kim
Affiliation:
Center for Noncrystalline Materials, Department of Metallurgical Engineering, Yonsei University, 134 Shinchon-dong, Seodaemun-ku, Seoul, 120-749, Korea
*
a)Address all correspondence to this author. e-mial: smlee@kitech.re.kr
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Abstract

Formation of the icosahedral quasicrystalline phase in conventionally cast Al62Cu25.5Fe12.5 and Al55Cu25.5Fe12.5Be7 alloys were investigated. The icosahedral phase (I-phase) forming ability was greatly improved by partial replacement of Al by 7 at.% Be. The as-cast Al55Cu25.5Fe12.5Be7 alloy consisted of dendritic primary I-phase and interdendritic τ-phase, whereas that of an as-cast Al62Cu25.5Fe12.5 alloy consisted of various phases such as the β-, I-, and τ-phases, together with a small amount of the λ- and η-phases. The kinetic barrier for transformation into single I-phase by heat treatment was greatly reduced in an Al55Cu25.5Fe12.5Be7 alloy. The I-phase in an Al55Cu25.5Fe12.5Be7 alloy has the same face centered icosahedral structure as that in an Al62Cu25.5Fe12.5 alloy and is of high quality without phason strain.

Type
Articles
Information
Journal of Materials Research , Volume 16 , Issue 6 , June 2001 , pp. 1535 - 1540
Copyright
Copyright © Materials Research Society 2001

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