Microstructure evolution of as-cast Nb-Ti-C alloys

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 (Nb ss), carbides (Nb 2C, (Nb, Ti)C) and eutectic of Nb ss/MC. Carbides in the Nb-Ti-C alloys change from...

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Bibliographic Details
Published in:Transactions of Nonferrous Metals Society of China 2009-09, Vol.19 (z2), p.s440-s443
Main Authors: WEI, Wen-qing, WANG, Hong-wei, GAO, Zeng-xin, WEI, Zun-jie
Format: Article
Language:English
Subjects:
Alloys
carbide transformation
Carbides
Eutectics
Microstructure
Morphology
Nb-Ti-C alloy
Niobium
Niobium base alloys
niobium solid solution
Titanium
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Summary: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 (Nb ss), carbides (Nb 2C, (Nb, Ti)C) and eutectic of Nb ss/MC. Carbides in the Nb-Ti-C alloys change from Nb 2C to (Nb, Ti)C with the increase of titanium content. Microstructures in the as-cast state include primary plate-like Nb 2C, eutectic of Nb ss/Nb 2C, Nb ss and secondary needle-like Nb 2C in Nb-5Ti-4C alloy, and other microstructures are primary Nb ss, eutectic of Nb ss/(Nb, Ti)C. Morphology of carbides are changed apparently through adding different Ti contents, and morphology of Nb ss changes from the cellular structure to dendrite.
ISSN:1003-6326
DOI:10.1016/S1003-6326(10)60085-4