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| Journal Article | FZJ-2014-06421 |
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2014
Elsevier
Lausanne
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Please use a persistent id in citations: doi:10.1016/j.jallcom.2014.01.114
Abstract: Phase equilibria in the Al–Ni–Pt alloy system were specified. The total compositional region of the ternary phase diagram can coarsely be divided into three peculiar subregions. Above ∼70 at.% Al this alloy system is characterized by the formation of complex binary and ternary phases. Between ∼40 and 70 at.% Al the structures based on the CsCl-type configuration dominate, while below ∼40 at.% Al the structures are based on the FCC (Ni, Pt) solid solution. The high-Al subregion was completed with the recently revealed binary high-temperature “Al3Pt” ξ-phase (Bmmb (No. 63), a = 1.9718, b = 1.6228, c = 1.4266 nm), which was found to extend up to 1.6 at.% Ni. In the medium-Al subregion the ternary extension of the Al2Pt phase (β*) separates the compositional regions extending from Al3Ni2 and Al3Pt2. At 900–1100 °C no complete separation was revealed between the compositional fields of the β-phase and β*. With decreasing temperature the total β + β* field shrinks around the compositional lines Al2Pt–Al2NiPt and AlNi–Al2NiPt. In the low-Al subregion the low-Ni limit of the γ♦-phase region, probably extending at low temperatures from Al3Ni5, was found to be below 4 at.%.
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