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Microstructure and mechanical properties of NiAl/Al2O3 composites

Published online by Cambridge University Press:  26 July 2012

Chii-Shyang Hwang  and
Tien-Jui Liu
Chii-Shyang Hwang
Affiliation:
Department of Materials Science and Engineering, National Cheng-Kung University, Tainan, Taiwan, Republic of China
Tien-Jui Liu
Affiliation:
Department of Materials Science and Engineering, National Cheng-Kung University, Tainan, Taiwan, Republic of China
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Extract

To improve mechanical properties of NiAl, a method for making NiAl matrix composites containing oxide ceramics is introduced. The method involves oxidation of NiAl powder in air to form a thin and uniform oxide scale, mainly Al2O3, on the NiAl particles. The Al2O3 contents increase with increasing oxidation temperature. The NiAl/Al2O3 composites are then formed by hot-pressing the oxidized NiAl powder under vacuum atmosphere. Al2O3 inhibits the grain growth of NiAl during the hot-pressing. The residual stress and the Ni-rich NiAl composition exist in the hot-pressed NiAl/Al2O3 composites. Strength and toughness data on NiAl/Al2O3 composites indicate that the use of oxidation of NiAl powder is a viable technique for improving these properties over that of monolithic NiAl.

Type
Articles
Information
Journal of Materials Research , Volume 14 , Issue 1 , January 1999 , pp. 75 - 82
Copyright
Copyright © Materials Research Society 1999

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