Liquidus surface projection and vertical sections of the phase diagram for the Mo–Mo5SiB2–TiC pseudo-ternary system

TiC-reinforced Mo–Si–B alloys (designated as MoSiBTiC alloys) exhibit great potential for application in the aerospace industry, due to their high melting point, moderate density and attractive high-temperature strength and creep resistance. Nevertheless, further material design and industrialization requires more systematic understanding of the phase diagram and solidification paths of Mo–Mo 5 SiB 2 –TiC pseudo-ternary system. In this study, an advanced ultra-high temperature thermal analysis method employing blackbody radiation and an electromagnetic levitation technique for in situ observation of the solidification process, were utilized to experimentally investigate the solidification process and reaction temperature of alloys in the vicinity of the Mo–Mo 5 SiB 2 –TiC ternary eutectic point. On the basis of the experimental results, three vertical sections of phase diagram at 9 mol% Mo 5 SiB 2 , 10 mol% TiC, and 70 mol% Mo ss isopleths in the Mo–Mo 5 SiB 2 –TiC pseudo-ternary system were established. The liquidus surface projection on the Mo–Mo 5 SiB 2 –TiC system has also been reconstructed, with the addition of a new Mo 2 B primary phase region and a larger Mo 5 SiB 2 primary phase region than previously reported. • The solidification path of the Mo–Mo 5 SiB 2 –TiC pseudo-ternary system was studied. • Ultra-high temperature thermal analysis and electromagnetic levitation were used. • Three vertical sections of the phase diagram for Mo–Mo 5 SiB 2 –TiC were established. • The liquidus surface projection was reconstructed with a new Mo 2 B primary region.