Abstract
Nb–Ti–Si based alloys are considered as candidates of next-generation high temperature materials (i.e., working temperature >1200°C). Boron has a beneficial effect in enhancing the oxidation resistance and reducing the anisotropy ratio ac/aa of the T2 phase in the Nb–Si alloys. The liquid–solid multiphase equilibria in the Nb–Ti–Si alloys with B additions have been investigated via an approach of integrating thermodynamic modeling with designed experiments. The present study suggests that Ti and Si additions increase the stability of Nb3B2, and the primary region of Nb3B2 will appear in the Nb–Ti–Si–B quaternary, while there is no primary solidification region of Nb3B2 in the constitute binaries and ternaries. The proposed liquidus surface of the Nb-rich Nb–Ti–Si–B system is associated with eight primary solidification regions of Nbss, T2, T1, D88, (Nb,Ti)3Si, NbB, TiB and Nb3B2. The direct eutectic solidification occurs between Nbss and T2 in the Nb-rich region in the Nb–Ti–Si–B liquidus projection, which could provide new opportunities for alloy design based on the Nb–Ti–Si–B system.
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