Abstract
Phase equilibria in Al–Pt–Rh were studied in the whole compositional range at 1100°C and above 50 and 70at.% Al at 900 and 810°C, respectively. The continuous region of the fcc γ solid solutions extends from the Pt–Rh terminal up to 15at.% Al. At elevated temperatures the isostructural AlRh and high-temperature AlPt β-phases probably form a continuous compositional region. Wide ternary extensions of the phases Al4Pt, Al21Pt8, low-temperature AlPt (μ), Al3Pt5, AlPt2 and AlPt3 were revealed along approximately constant Al concentrations. In contrast, the dissolution of Rh in the Al2Pt phase (β∗) results in a visible decrease of its Al concentration. The Al–Rh C-phase and ε-phase dissolve up to 15 and 18at.%. Pt, respectively. Only the ε6 structural variant was observed at ternary compositions. The formation of the ternary χ-phase (P31c, a=1.2201, c=2.7243nm for Al75.5Pt16.9Rh7.6) was revealed in a compositional region between ∼Al75Pt21.5Rh3.5 and ∼Al76Pt6.5Rh17.5. The other ternary C2-phase (Fm3¯, a=1.5419nm) was revealed around Al69Pt9Rh22.
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