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Discussion of “On the free energy of formation of TiC and Al4C3”

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  • Physical Chemistry
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Abstract

Several years ago, Banerji and Reif[1] reported some very interesting studies on a process to react Ti and C in molten Al to form particles of TiC. The process was used to prepare a master alloy with a fine dispersion of TiC to inoculate Al for grain refinement. Approximately 2 wt pct of preheated graphite particles were stirred into the Al-5 to 10 pct Ti melts. The authors explained that the melts needed to be superheated above 1000 °C to avoid the undesirable formation of A14C3 and Ti3AlC at the TiC/melt interface. Their explanation for this phenomenon was based on thermodynamics. They observed that the standard free energy of formation curves for AI4C3 and TiC cross near 1175 °C, with A14C3 having the lower free energy of formation below this temperature. There are several aspects of this work which merit further discussion.

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References

  1. A. Banerji and W. Reif:Metall. Trans. A, 1986, vol. 17A, pp. 2127–37.

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  2. T. Rosenqvist:Principles of Extractive Metallurgy, 2nd ed., McGraw-Hill, Inc., New York, NY, 1983, p. 492.

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  3. D. Lloyd and B. Chamberlain: inCast Reinforced Metal Com-posites, S. Fishman and A. Dhingra, eds., ASM, Metals Park, OH, 1988, pp. 263–69.

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  4. J. L. Murray:Binary Alloy Phase Diagrams, T. B. Massalski, ed., ASM, Metals Park, OH, 1986, p. 175.

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Authors and Affiliations

  1. Department of Materials Science and Engineering, Materials Research Center, Northwestern University, 60208-3108, Evanston, IL

    M. E. Fine (Professor Emeritus)

  2. Research and Development Center, Ryobi Limited, 5-2-8 Toshima, Kita-ku, 114, Tokyo, Japan

    J. G. Conley (Staff Scientist)

Authors
  1. M. E. Fine
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  2. J. G. Conley
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Fine, M.E., Conley, J.G. Discussion of “On the free energy of formation of TiC and Al4C3”. Metall Trans A 21, 2609–2610 (1990). https://doi.org/10.1007/BF02647010

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  • DOI: https://doi.org/10.1007/BF02647010

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