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Tensile and fracture properties of NiAl/Ni micro-laminated composites prepared by reaction synthesis

Published online by Cambridge University Press:  01 May 2006

Hee Y. Kim ,
Dong S. Chung ,
M. Enoki  and
Soon H. Hong
Hee Y. Kim
Affiliation:
Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology, Yuseong-gu, Daejeon 305-701, Korea
Dong S. Chung
Affiliation:
Department of Materials, Daegu Polytechnic College, Seo-gu, Daegu 681-280, Korea
M. Enoki
Affiliation:
Department of Materials Engineering, The University of Tokyo, Bunkyo-ku, Tokyo 113-8656, Japan
Soon H. Hong*
Affiliation:
Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology, Yuseong-gu, Daejeon 305-701, Korea
*
a) Address all correspondence to this author. e-mail: [email protected]
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Abstract

The mechanical properties of NiAl/Ni micro-laminated composites with highly gradient microstructure have been investigated. Two types of composites with different gradient microstructures were prepared by reaction synthesis. Intermetallics of type I and type II composites mainly consisted of Al-rich Ni0.45Al0.55 with variable thickness and Ni-rich Ni0.58Al0.42 with similar thickness, respectively. As intermetallic volume fraction increased, yield strength of type II followed the rule-of-mixture well, while that of type I deviated due to the composition variation of intermetallic phases. Fracture toughness of type II was higher than that of type I, and all showed KR curves with upward curvature by large-scale bridging. Even though the relative strength of constituent phases in intermetallic/metal laminates was not constant due to the gradient microstructure, the fracture mode transition showed similar behavior to that of metal/ceramic laminates.

Keywords

Combustion synthesis (SHS)LayeredReactivity
Type
Articles
Information
Journal of Materials Research , Volume 21 , Issue 5 , May 2006 , pp. 1141 - 1149
Copyright
Copyright © Materials Research Society 2006

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