THE MICROSTRUCTURE OF SPRAY-FORMED TI-6AL-4V/SICF METAL-MATRIX COMPOSITES
Spray-forming is a possible manufacturing route for the fabrication of Ti alloy fibre-reinforced metal-matrix composites (MMCs) because high rates of alloy-droplet cooling on impact with the fibres prevent excessive fibre-matrix reaction. Ti-6Al-4V matrix MMC monotapes containing TiB2-coated SiC fib...
| Main Authors: | , , |
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| Format: | Journal article |
| Language: | English |
| Published: |
1993
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| Summary: | Spray-forming is a possible manufacturing route for the fabrication of Ti alloy fibre-reinforced metal-matrix composites (MMCs) because high rates of alloy-droplet cooling on impact with the fibres prevent excessive fibre-matrix reaction. Ti-6Al-4V matrix MMC monotapes containing TiB2-coated SiC fibres have been manufactured by electric-arc spray-forming, and the key MMC microstructural characteristics in the as-sprayed monotapes have been investigated by optical and scanning electron microscopy. Fibre infiltration increases with decreasing spraying distance, decreasing atomizing gas pressure and increasing arc current, because of higher temperatures in the Ti alloy spray droplets on impact with the fibres. Too much binder in the fibre preform leads to poor fibre-matrix contact, while removing the binder leads to the fibres becoming misaligned during spraying. |
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