Constitution of alloys and phase diagram of the Al–Ti–Rh system. IV. Melting diagram of the Ti–TiRh–AlRh–Al partial system

Based on constitution of the solidus surface of the Ti–TiRh–AlRh–Al partial system and on metallography, X-ray diffraction, electronic microprobe, and differential thermal analyses of its ascast alloys, the liquidus surface projection of the system is constructed onto the concentration triangle for the first time and the processes occurring in the crystallization of its alloys are studied. This has given an opportunity to construct the melting diagram of the Ti–TiRh–AlRh–Al partial system for the first time. Its liquidus surface is completed with 13 surfaces of primary crystallization of solid solutions based on components and phases based on binary and ternary compounds. In the Ti–TiRh–AlRh–Al partial system, there are 13 invariant four-phase equilibria involving liquid as well as nine invariant three-phase equilibria, eight of them being eutectic and one peritectic.