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The microstructure of spray‐formed Ti‐6Al‐4V/SiC f metal‐matrix composites
Author(s) -
ZHAO Y. Y.,
GRANT P. S.,
CANTOR B.
Publication year - 1993
Publication title -
journal of microscopy
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.569
H-Index - 111
eISSN - 1365-2818
pISSN - 0022-2720
DOI - 10.1111/j.1365-2818.1993.tb03303.x
Subject(s) - materials science , microstructure , composite material , alloy , scanning electron microscope , spray forming , fabrication , optical microscope , matrix (chemical analysis) , titanium alloy , metal , metallurgy , medicine , alternative medicine , pathology
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 TiB 2 ‐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.