An experimental investigation of the phase relations in the titanium (Ti)-aluminum (Al)-silicon (Si) system was undertaken by differential thermal analysis, x-ray diffraction, metallography, and microprobe analysis. The present measurements when combined with those from an earlier investigation at this laboratory provide data for 56 alloy compositions in the Ti-Al-Si system. The combined results allowed the construction of a solidus projection, a melting diagram including both solidus and liquidus, partial isothermal sections at 1270°C and 1250°C, three isopleths with a constant percentage of one or another component, and a reaction scheme. along the Si-Al side of the ternary system was studied by Kamei et al. [1968Kam] andZakharov et al. [1988Zak]. According to Kamei et al. [1968Kam], two invariant equilibria occur in this part of the system: peritectic L + TiAl 3 ↔ TiSi 2 Al + Al; and eutectic L ↔ TiSi 2 Al + Al + Si. The reaction temperatures were not given. Two peritectic equilibria were reported by [1988Zak]: L
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