A study of the Al-rich part of the Al–Ni–Pt alloy system

Abstract

a b s t r a c tThe Al-Ni-Pt phase diagram was studied in the compositional region from 50 to 100 at.% Al. Isothermal sections were determined at 1000, 900 and 790 • C. At 1000 • C the Al 2 Pt phase was found to extend up to ∼Al 53 Ni 23 Pt 24 composition, separating the (Al 3 Pt 2 ) and (Al 3 Ni 2 ) phase fields. Two ternary structures were revealed. The one forming between ∼Al 75 Ni 3 Pt 22 and Al 75 Ni 9 Pt 16 is rhombohedral isostructural to Al 28 Ir 9 and the other forming between ∼Al 73 Ni 8 Pt 19 and Al 72.5 Ni 18 Pt 9.5 has an orthorhombic 6 structure typical of Al-Pd and Al-Rh.

Influence of the superalloy substrate in the synthesis of the Pt-modified aluminide bond coat made by slurry

“…Note that no Pt x Al y appeared after annealing of Pt, in agreement with the observations of Ford et al in TMS-82 [26] but in contrast with what is observed in CMSX-4 annealed at 1050°C [4,13]. Indeed, for Pt x Al y to form, significant Al contents are requiredat least at very local scale - [27] and this depends on the initial Al con- 247LC than in the SX CMSX-4) and on the annealing conditions. Even so, the uphill diffusion of Al of 22 at.% observed in a 7-μm Pt-plated René N5 after annealing was insufficient to observe the formation of Pt x Al y [28].…”

“…Further to the major Al inward diffusion to form the Ni 2 Al 3 phase at this intermediate temperature [19], Ni outward diffusion could also occur [31] since the PtAl 2 peaks shifted to greater diffraction angles compared to pure PtAl 2 . Still, the greater thermodynamic stability of PtAl 2 than that of Ni 2 Al 3 underlined by Grushko et al at 790°C [27] indicates that PtAl 2 can easily dissolve Ni and still maintain its phase stability in this temperature range.…”

Machine Learning to Predict Quasicrystals from Chemical Compositions

“…We verified the validity of the predicted phase diagrams based on the experimental stable quasicrystal and approximant phase regions of the 30 systems that were extracted from the literature. [ 34–58 ] We found 198 papers published by Prof. Grushko's group, which include ternary phase diagrams of Al–transition elements encompassing 64 unique alloy systems. Excluding the systems containing the 80 stable quasicrystal and 78 approximant compositions used for training, the remaining 30 systems were used for performance evaluation.…”

Thermodynamic remodeling of the Al–Pt system towards an assessment of the Al–Ni–Pt system

“…Since the publication of the previous Al-Pt description [1], Grushko et al [16,17,46,47,49] has performed a series of extensive experiments with regards to the Al-Pt and Al-Ni-Pt systems in order to rectify some of the disagreements present in the literature. These include the stability of B2 [46] and Al-rich intermetallics in the Al-Pt binary system [47].…”