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Precipitation of icosahedral quasicrystalline phase in Hf69.5Al7.5Ni11Cu12 metallic glass

Published online by Cambridge University Press:  31 January 2011

Chunfei Li  and
Akihisa Inoue
Chunfei Li*
Affiliation:
Inoue Superliquid Glass Project, ERATO, JST, Sendai 982-0807, Japan
Akihisa Inoue
Affiliation:
Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan
*
a)Address all correspondence to this author.li@sendai.jst.go.jp
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Abstract

A Hf69.5Al7.5Ni11Cu12 metallic glass was prepared by a single roller melt-spinning method, and the crystallization process was studied by x-ray diffraction, differential scanning calorimetry, and transmission electron microscopy. The metallic glass crystallizes through three exothermic reactions. The low-temperature exothermic reaction corresponded to the precipitation of an icosahedral quasicrystalline phase. Further annealing at higher temperature led to the decomposition of the icosahedral quasicrystalline phase to other stable crystalline phases, indicating that the precipitated icosahedral quasicrystalline phase was in a metastable state. The crystallization process of the present alloy was compared with that of other Hf–Al–Ni–Cu alloys, and the reason for the precipitation of the icosahedral quasicrystalline phase was discussed.

Type
Articles
Information
Journal of Materials Research , Volume 16 , Issue 4 , April 2001 , pp. 1190 - 1194
Copyright
Copyright © Materials Research Society 2001

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References

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