Abstract
The structure and phase transformations in the Ti–Al–C system were studied by X-ray diffraction, differential thermal analysis, and scanning electron microscopy, including energy-dispersive X-ray spectroscopy and electron backscatter diffraction on samples obtained by arc melting and annealing at high temperatures. The ternary system has a cocrystallization region for the two MAX-phases, N and H. The Ti41.5Al38.5C20 samples contain three phases at all experimental temperatures (from 650 to 1660°C): Ti3AlC2 (N-phase of Ti3SiC2 type), Ti2AlC (H, Cr2AlC type), and binary intermetallic TiAl3 (e, its own crystal type). The morphology of the as-cast alloy and annealed samples (at temperatures above and below the solidus temperature, 1660 and 1250°C, respectively) shows that invariant solidification at 1405°C (solidus temperature) precedes the univariant simultaneous solidification of N- and H-phases, i.e. both MAX-phases separating from the melt.
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