Abstract
Ternary Nb-Ti-Si phase equilibria have been investigated for the metal-rich end of the ternary phase diagram using scanning electron microscopy, XRD, and electron beam microprobe analysis. Microstructural and microchemical observations have been used to define isothermal sections at temperatures of 1500 and 1340 °C. These temperatures delineate regimes defined by liquid-solid reactions. Additional isothermal sections were estimated at 1350,1320, and 1150 °C using these data. A broad range of Nb and Ti compositions were investigated for Si concentrations up to 35.0 %. Alloys containing up to four phases, Nb(Ti)5Si3, Ti(Nb)5Si3, (Nb,Ti)3Si, and (Nb,Ti,Si) were studied. The effect of Ti on the eutectoid reaction, (Nb,Ti)3Si → (Nb,Ti,Si) + Nb(Ti)5Si3 was investigated, as was the effect of Nb on the peritectoid reaction, Ti(Nb)5Si3 + (Nb,Ti,Si) → (Nb,Ti)3Si.
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