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Nb-Ti-C alloys with different Ti contents(4%-16%,mole fraction)were fabricated by vacuum non-consumable arc-melting method.The results indicate that the alloys contain niobium solid solution(Nbss),carbides(Nb2C,(Nb,Ti)C)and eutectic of Nbss/MC.Carbides in the Nb-Ti-C alloys change from Nb2C to(Nb,Ti)C with the increase of titanium content. Microstructures in the as-cast state include primary plate-like Nb2C,eutectic of Nbss/Nb2C,Nbss and secondary needle-like Nb2C in Nb-5Ti-4C alloy,and other microstructures are primary Nbss,eutectic of Nbss/(Nb,Ti)C.Morphology of carbides are changed apparently through adding different Ti contents,and morphology of Nbss changes from the cellular structure to dendrite.
Nb-Ti-C alloys with different Ti contents (4% -16%, mole fractions) were fabricated by vacuum non-consumable arc-melting method. The results indicate that the alloys contain niobium solid solution (Nbss), carbides (Nb, Ti) C) and eutectic of Nbss / MC. Carbides in the Nb-Ti-C alloys change from Nb2C to (Nb, Ti) C with the increase of titanium content. Microstructures in the as-cast state include primary plate -like Nb2C, eutectic of Nbss / Nb2C, Nbss and secondary needle-like Nb2C in Nb-5Ti-4C alloy, and other microstructures are primary Nbss, eutectic of Nbss / (Nb, Ti) adding different Ti contents, and morphology of Nbss changes from the cellular structure to dendrite.