Phase equilibria and transformations in a Ti-Zr-Si system

The phase equilibria in the titanium-zirconium rich region of the ternary Ti-Zr-Si system have been studied in the temperature range from 1473-1323K, together with microstructures present in the as-cast state. DTA, microscopy, x-ray diffraction (XRD) and chemical analysis by x-ray energy-dispersive...

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Published in:Metallurgical and materials transactions. A, Physical metallurgy and materials science Physical metallurgy and materials science, 1995-02, Vol.26 (2), p.243-257
Main Authors: Salpadoru, N. H., Flower, H. M.
Format: Article
Language:English
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Summary:The phase equilibria in the titanium-zirconium rich region of the ternary Ti-Zr-Si system have been studied in the temperature range from 1473-1323K, together with microstructures present in the as-cast state. DTA, microscopy, x-ray diffraction (XRD) and chemical analysis by x-ray energy-dispersive spectroscopy have been employed. Whereas Ti sub 5 Si sub 3 nucleates heterogeneously and grows rapidly in Ti matrices, Ti sub 3 Si exhibits very slow precipitation kinetics. It also is displaced by (Ti,Zr) sub 5 Si sub 3 and a ternary silicide in ternary and more complex systems, explaining its absence in commercial alloys. Zirconium exhibits substantial solid solubility in Ti sub 5 Si sub 3 in ternary alloys, while Ti exhibits only limited solubility in Zr sub 2 Si, Zr sub 3 Si and Zr sub 5 Si sub 3 . Additionally, a new silicide of general formula (Ti,Zr) sub 2 Si is formed in ternary alloys with a Ti:Zr ratio ranging from 2.26 to 0.68. Isothermal sectins for the Ti-Zr-Si system are presented for temperatures of 1473 and 1323K.
ISSN:1073-5623
1543-1940
DOI:10.1007/BF02664663