Abstract
Abstract The liquidus projection and the isothermal section at 1 300 °C of the Nb–Si–V ternary system were experimentally studied. Using scanning electron microscopy, electron probe microanalysis and X-ray diffraction, the primary solidification phases and the precipitation paths in each region of the liquidus projection as well as the equilibrium relations of the phases in the isothermal section were determined. Ten primary solidification regions were found in the liquidus projection and eight three-phase equilibrium regions were observed in the isothermal section at 1 300 °C. The compounds βNb5Si3 with V5Si3 and NbSi2 with VSi2 are the phases of the same structure but different compositions and form two linear compounds βNb(V)5Si3 or V(Nb)5Si3 and Nb(V)Si2 or V(Nb)Si2, respectively The ternary linear compound (Nb,V)2Si with the stoichiometry about 2 : 1 of (Nb + V) : Si was found in both the liquidus projection and the isothermal section at 1 300 °C.
Highlights
In the multi-component Nb–Si-based alloy systems, the balance of the mechanical properties such as room temperature toughness, high temperature creep resistance and oxidation resistance can be achieved by adding alloying elements to stabilize intermetallic compounds and by forming Laves phase
The study of the phase equilibria of the Nb–Si–V ternary system is of great practical significance
The information of all the stable binary solid phases in the Nb–Si, the V–Si and the Nb–V binary systems constituting the Nb–Si–V ternary system is summarized in Table 1 [18 – 20]
Summary
In the multi-component Nb–Si-based alloy systems, the balance of the mechanical properties such as room temperature toughness, high temperature creep resistance and oxidation resistance can be achieved by adding alloying elements to stabilize intermetallic compounds and by forming Laves phaseInt. In the multi-component Nb–Si-based alloy systems, the balance of the mechanical properties such as room temperature toughness, high temperature creep resistance and oxidation resistance can be achieved by adding alloying elements to stabilize intermetallic compounds and by forming Laves phase. The bcc solid solution phase Nbss provides room temperature toughness and ductility, and the Nb5Si3 intermetallic compound provides high temperature strength. The Nb–Si binary system includes the solid solution phases bcc(Nb) and Diamond(Si), the intermetallic compounds Nb3Si, aNb5Si3, bNb5Si3, NbSi2 and the liquid phase. The V–Si binary system includes the solid solution phases bcc(V) and Diamond(Si), four stable intermetallic compounds V3Si, V5Si3, V6Si5 [12], VSi2, and the liquid phase. Li et al [17] measured the phase equilibrium relations of the
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