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Cocrystallization of Max-Phases in the Ti–Al–C System

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Powder Metallurgy and Metal Ceramics Aims and scope

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 (ε, 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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Notes

  1. * Sc2O3 crucibles, 20 °C/min heating and cooling rate.

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Authors and Affiliations

  1. Frantsevich Institute for Problems of Materials Science, National Academy of Sciences of Ukraine, Kiev, Ukraine

    S. V. Sleptsov, A. A. Bondar, V. M. Petyukh, O. I. Dovbenko & T. Ya. Velikanova

  2. ACCESS e.V., Aachen, Germany

    V. T. Witusiewicz & U. Hecht

  3. Research Center of RWTH Aachen University, Aachen, Germany

    B. Hallstedt

Authors
  1. S. V. Sleptsov
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  2. A. A. Bondar
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  3. V. T. Witusiewicz
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  4. U. Hecht
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  5. B. Hallstedt
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  6. V. M. Petyukh
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  7. O. I. Dovbenko
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  8. T. Ya. Velikanova
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Correspondence to A. A. Bondar.

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Translated from Poroshkovaya Metallurgiya, Vol. 54, Nos. 7–8 (504), pp. 111–124, 2015.

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Sleptsov, S.V., Bondar, A.A., Witusiewicz, V.T. et al. Cocrystallization of Max-Phases in the Ti–Al–C System. Powder Metall Met Ceram 54, 471–481 (2015). https://doi.org/10.1007/s11106-015-9738-z

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  • DOI: https://doi.org/10.1007/s11106-015-9738-z

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