The TiAl-VAL-MAl3 sections of the Al-Ti-V-M (M = Ni, Fe) systems at room temperature have been determined by X-ray diffraction method. (1) The TiAl3-VAl3-NiAl3 pseudoternary system is composed of the e(NiAl3) phase region, d phase region (the d phase is a continuous series of solid solutions formed from the compound TiAl3 with the compound VA13), and ε+δ two-phase region. (2) The TiAl3-VAl3-FeAl3 pseudoternary system is composed of the θ(FeAl3) phase region, δ phase region (the phase is the same as in the TiAl3-VAl3-NiAl3 system), and θ+δ two-phase region. No new phase has been found other then those already encountered in the four corresponding binary systems and the three corresponding ternary systems.
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