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Precipitation of icosahedral phase from amorphous Zr65Cu17.5−xAl7.5Ni10Agx (x = 0, 5) alloys

Published online by Cambridge University Press:  31 January 2011

J. K. Lee ,
G. Choi ,
W. T. Kim  and
D. H. Kim
J. K. Lee
Affiliation:
Center for Noncrystalline Materials, Department of Metallurgical Engineering, Yonsei University, 134 Shinchon-dong, Seoul, 120-749, Korea
G. Choi
Affiliation:
Center for Noncrystalline Materials, Department of Metallurgical Engineering, Yonsei University, 134 Shinchon-dong, Seoul, 120-749, Korea
W. T. Kim
Affiliation:
Department of Physics, Chongju University, 36 Naedok Dong, Chongju 360-764, Korea
D. H. Kim
Affiliation:
Center for Noncrystalline Materials, Department of Metallurgical Engineering, Yonsei University, 134 Shinchon-dong, Seoul, 120-749, Korea
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Abstract

Crystallization behavior of amorphous Zr65Cu17.5−xAl7.5Ni10Agx (x = 0, 5) alloys prepared by melt spinning and injection casting techniques has been studied using differential scanning calorimetry, x-ray diffractometry, and transmission electron microscopy. Ag addition changes crystallization sequence of the amorphous phase. The amorphous Zr65Cu17.5Al7.5Ni10 alloy crystallizes via simultaneous precipitation of icosahedral phase and NiZr2 phase in the first crystallization step whereas that in Zr65Cu12.5Al7.5Ni10Ag5 alloy crystallizes via precipitation of only icosahedral the phase. Partial replacement of Cu by Ag in Zr65Cu17.5Al7.5Ni10 alloy stabilized the icosahedral phase relative to competing intermetallic phases resulting in suppression of the precipitation of the NiZr2 phase, enhancement of the precipitation of icosahedral phase, and reduction of undercooled liquid range. Crystallization behavior of the amorphous Zr65Cu12.5Al7.5Ni10Ag5 alloy is not affected by cooling rate during solidification. Johnson–Mehl–Avrami analysis of isothermal transformation data suggests that the formation of the quasicrystalline phase is not entirely polymorphic in nature and may involve partitioning of the solute at later state.

Type
Articles
Information
Journal of Materials Research , Volume 16 , Issue 5 , May 2001 , pp. 1311 - 1317
Copyright
Copyright © Materials Research Society 2001

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