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Formation of Al3Ni Nanofibers in an Al-Based Metal Matrix Composite Fabricated by Reaction Sintering

Published online by Cambridge University Press:  03 March 2011

Peng Yu ,
Cheng-Ji Deng ,
Nan-Gang Ma  and
Dickon H.L. Ng
Peng Yu
Affiliation:
Department of Physics, The Chinese University of Hong Kong, Shatin, Hong Kong, China
Cheng-Ji Deng
Affiliation:
Department of Physics, The Chinese University of Hong Kong, Shatin, Hong Kong, China
Nan-Gang Ma
Affiliation:
Department of Physics, The Chinese University of Hong Kong, Shatin, Hong Kong, China
Dickon H.L. Ng
Affiliation:
Department of Physics, The Chinese University of Hong Kong, Shatin, Hong Kong, China
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Abstract

We developed an Al2O3 and Al3Ni intermetallic reinforced Al-based metal matrix composite by sintering an Al-20 wt% NiO powder compact at 1000 °C. Differential thermal analysis showed that a two-step reaction took place between Al and NiO in the temperature range 600–650 °C. The initial stage was a solid-state reaction, but it was soon paused by the newly formed Al2O3 and Al3Ni phases that separated the Al and NiO grains. A liquid–solid reaction was later resumed as the temperature was increased above the eutectic temperature of Al–Al3Ni at 640 °C when molten Al–Ni appeared. When the molten sample was quenched to room temperature, a two-phase Al–Al3Ni eutectic was found in the sample. In comparison with the air-quenched and the oil-quenched samples, the sizes of proeutectic Al3Ni grains and Al–Al3Ni eutectic phases in the salt-solution-quenched sample were much finer. The eutectic contained Al3Ni nanofibers with a diameter of approximately 50 nm. A reaction model of Al and NiO was proposed. A thermodynamic model was also proposed to describe the formation of the composite.

Keywords

AluminumNickelNano-eutectic
Type
Articles
Information
Journal of Materials Research , Volume 19 , Issue 4 , April 2004 , pp. 1187 - 1196
Copyright
Copyright © Materials Research Society 2004

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