Abstract
The solid state phase equilibria of the Al–Cr–Ho ternary system at 500°C were experimentally investigated. The phase relations at 500°C are governed by 14 three-phase regions, 29 two-phase regions and 15 single-phase regions. The existences of 10 binary compounds and 2 ternary phases have been confirmed. Al11Cr2, Al11Cr4 and Al17Ho2 were not found at 500°C. Crystal structures of Al9Cr4 and Al8Cr4Ho were determined by the Rietveld X-ray powder data refinement. Al9Cr4 was found to exhibit cubic structure with space group I4̄3m (no. 217) and lattice parameters a=0.9107(5)nm. Al8Cr4Ho crystallizes in ThMn12 structure type with space group I4/mmm (no. 139) and lattice parameters a=0.8909(4)nm, c=0.5120(5)nm. It is concluded that the obtained Al4Cr phase in this work should be μ-Al4Cr by comparing with XRD pattern of the hexagonal μ-Al4Mn compound.
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