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To determine the liquid-solid phase equilibria of the Nb-Si-Ti ternary system,Nb-Si-Ti alloys of different compositions are pre-pared. By means of scanning electron microscopy (SEM),X-ray diffraction (XRD) and electron probe microanalysis (EPMA),the phases in the alloys,such as Si-based solutions,Ti(Nb)Si,Ti(Nb)Si2,Nb(Ti)Si2,Ti(Nb)5Si4,Nb(Ti)5Si3,Ti(Nb)5Si3,Nb(Ti)3Si and Nb-based solutions are identified,and the phase evolution is analyzed. As a result,the microstructural and microchemical evidence pro-vides a clear definition of the Nb-Si-Ti liquidus surface projection and indicates that the ternary phase diagram has seven transition reac-tions.
To determine the liquid-solid phase equilibria of the Nb-Si-Ti ternary system, Nb-Si-Ti alloys of different compositions are pre-pared. By means of scanning electron microscopy (SEM), X-ray diffraction such as Si-based solutions, Ti (Nb) Si, Ti (Nb) Si2, Nb (Ti) Si2, Ti (Nb) 5Si4, Nb (Ti) 5Si3, Ti (Nb) 5Si3, Nb (Ti) 3Si and Nb-based solutions are identified, and the phase evolution is analyzed. As a result, the microstructural and microchemical evidence pro-vides a clear definition of the Nb-Si-Ti liquidus surface projection and indicates that the ternary phase diagram has seven transition reac-tions.