Abstract
The Al-C, Si-C, and Al-Si-C systems were investigated by metallography, X-ray diffraction, electron microprobe, and thermal analysis. Internally sealed liquidus crucibles were used to determine the solubility of C in Al and Si in the range 1700° to 2150 °C and isothermal sections for the ternary system at 2000° and 2150 °C. The isopleth Al4C3-SiC, determined in the range 1900° to 2300 °C, was found to contain the ternary intermediate phases 2A14C3 · SiC and A14C3 · SiC, which decompose incongruently at 2085° and 2080 °C, respectively. The incongruent decomposition temperature of A14C3 (2156 °C) was confirmed. A phase reported by others with the stoichiometry Al4C3-2SiC was not confirmed. A partial liquidus surface was mapped from the carbon solubility and thermal analysis measurements.
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Oden, L.L., McCune, R.A. Phase equilibria in the Al-Si-C system. Metall Trans A 18, 2005–2014 (1987). https://doi.org/10.1007/BF02647073
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DOI: https://doi.org/10.1007/BF02647073