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Investigation of NiAl–TiB2in situcomposites

Published online by Cambridge University Press:  31 January 2011

J. T. Guo  and
Z. P. Xing
J. T. Guo
Affiliation:
Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110015, People's Republic of China
Z. P. Xing
Affiliation:
Beijing Institute of Aeronautical Materials, Beijing 100095, People's Republic of China
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Abstract

A hot-pressing aided exothermic synthesis (HPES) technique to fabricate NiAl matrix composites containing 0 and 20 vol.% TiB2 particles was developed. The conversion of mixtures of elements to the product was complete after processing, and TiB2 particles in the matrix were uniformly dispersed. The microstructure and interfaces were very thermally stable. The interfaces between NiAl and TiB2 were atomically flat, sharp, and generally free from interfacial phases. In some cases, however, thin amorphous layers existed at NiAl/TiB2 interfaces. At least three kinds of orientation relationships between TiB2 and NiAl were observed. The compressive yield strengths at room temperature and at 1000 °C of the composite were approximately three times as strong as those of the unreinforced NiAl. The tensile yield strength at 980 °C of the composite was about three times stronger than that of NiAl. The ambient fracture toughness of the composite was slightly greater than that of the monolithic NiAl.

Type
Articles
Information
Journal of Materials Research , Volume 12 , Issue 4 , April 1997 , pp. 1083 - 1090
Copyright
Copyright © Materials Research Society 1997

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