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Isothermal section of the Al-V-RE (RE = Gd, Ho) ternary systems at 773 K (500°C) was investigated over the whole concentration range by means of X-ray diffraction and scanning electron microscopy equipped with energy dispersive X-ray analysis. The crystal structures of the Al 43 Mo 4 Ho 6 -type ternary compounds Al 43 V 4 RE 6 were determined with Rietveld refinement method. The intermetallic compound Al 43 V 4 Gd 6 belongs to the Space group P6 3 /mcm, with cell parameters of a = b = 1.0996(6) nm, c = 1.7813(9) nm, a = b = 90 deg, c = 120 deg, and volume of unit cell of 1.8658(9) nm 3 . At 773 K (500°C), all the Al-rich ternary alumides, i.e., reported in the literature were not found. Fifteen and 14 ternary phase fields have been identified in the isothermal section of the Al-V-Gd and Al-V-Ho ternary systems, respectively. The solid solubility of V in Al 2 RE 3 , AlRE, and Al 2 RE amounts to approximately 1.0 at. pct to 2.0 at. pct, whereas the solid solubility of Al in V is approximately 39 at. pct.

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Phase equilibria in the title system at 773 K are characterized by powder XRD, SEM, and EDX.