Paper number 1142


Sergei T. Mileiko1, Sergei E. Salibekov2, Nicholas V. Petrushin2, Andrew A. Kolchin1, Valerie P. Korzhov1, Vjacheslav M. Kiiko1, and Anatol A. Khvostunkov1

1Solid State Physics Institute of the Russian Academy of Sciences, Chernogolovka Moscow district, 142432 RUSSIA
2Russian Institute of Aviation Materials, 17, Radio str., Moscow, 107005, RUSSIA

Summary Sapphire and alumina-YAG-eutectic fibres produced by the internal crystallisation method are used as reinforcement in a Ni3Al-intermetallic-based matrix. Because of rather unusual form of the reinforcement, special procedures were developed to deal with the fibres including coating and introducing them into the matrix by using pressure infiltration technique. A possibility to improve matrix properties by uni-directional crystallisation of it was also checked. Tensile testing of the composites at a temperature of 1200C shows that oxide fibres produced by the internal crystallisation method (ICM-fibres) have a potentiality to be reinforcement for heat resistant composites. Sapphire fibres with a great scale dependence of the strength introduced into a Ni-based alloy not modified specially to serve as a matrix for the composite cannot contribute their potential strength to the composite strength because of a weak fibre/matrix interface. Occurring a rare-earth-metal oxide as a fibre component yields certainly an increase in the fibre/matrix strength, which determines an essential increase in the composite strength. All the experiments described were conducted on a background of a corresponding theory of composite strength.
Keywords heat-resistant materials, intermetallic matrix composites, oxide fibre, fabrication methods, pressure infiltration, strength, creep rupture, fibre coating.

Theme : Metal Matrix Composites ; Microstructure/Properties Relationship

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