α-NiPt(Al) and phase equilibria in the Ni–Al–Pt system at 1150 °C

Hayashi, Shigenari; Ford, S.I.; Young, David J.; Sordelet, D.J.; Besser, M.F.; Gleeson, Brian

doi:10.1016/j.actamat.2005.03.046

Cited by 105 publications

(60 citation statements)

References 16 publications

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“…A composition gradient is observed from the surface through the coating thickness moving to the B2 + L12 region as it approaches the IDZ boundary [10]. The crystal structure from the surface of the as-received and heat-treated samples was verified by XRD (see Figure 2).…”

Section: Discussionmentioning

confidence: 90%

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Study of the Isothermal Oxidation Process and Phase Transformations in B2-(Ni,Pt)Al/RENE-N5 System

Cáceres-Díaz

Alvarado-Orozco

Ruiz-Luna

et al. 2016

Metals

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Changes in composition, crystal structure and phase transformations of B2-(Ni,Pt)Al coatings upon isothermal oxidation experiments (natural and scale free oxidation) at 1100 • C, as a function of time beyond their martensitic transformation, are reported. Specifically, the analysis of lattice parameter and composition are performed to identify changes in the B2-(Ni,Pt)Al phase upon the chemically-driven L1 0 -(Ni,Pt)Al and L1 2 -(Ni,Pt) 3 Al transformations. The B2-(Ni,Pt)Al phase was found to disorder and transform the martensite during the heat treatments for both oxidation experiments at approximately 36.3 and 40.9 at. % of Al, 47.7 and 42.9 at. % of Ni, 6.2 and 8.5 at. % of Pt, 4.2 and 2.9 at. % of Cr and 4.4 and 3.8 at. % of Co. The lattice constant and the long-range order parameter of the B2-(Ni,Pt)Al phase decreased linearly as a function of the elemental content irrespective of the nature of the oxidation experiments.

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Section: Discussionmentioning

confidence: 90%

“…Additionally, the Al-Ni-Pt phase diagram reported by Hayashi et al [10] proposes an extended region where the martensitic transformation may occur. Additions of 20 at.…”

Section: Discussionmentioning

confidence: 99%

Study of the Isothermal Oxidation Process and Phase Transformations in B2-(Ni,Pt)Al/RENE-N5 System

Cáceres-Díaz

Alvarado-Orozco

Ruiz-Luna

et al. 2016

Metals

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“…Furthermore, it can be assumed on the basis of the NiAlPt ternary phase diagram that simple addition of Pt to the Ni-based superalloy increased the volume fraction of the £ phase. 23) A TCP phase did not form in the £ phase, which has a high solubility limit, but it did form in the £A phase, which has a low solubility limit. 9) On the basis of these results, it can be assumed that it is unlikely that the presence of Pt promoted SRZ formation.…”

Section: ¹1mentioning

confidence: 99%

Effect of Thermal History on Microstructural Changes in Aluminized Nickel-Based Single-Crystal Superalloy

2013

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The effect of the thermal history on microstructural changes in aluminized and Pt-aluminized Ni-based single-crystal superalloys was investigated. The superalloy substrates were first electropolished to get rid of the residual surface strain. Then, Pt was electrodeposited and vacuum annealing was conducted for some of the substrates, and aluminized and Pt-aluminized specimens were prepared using the conventional aluminizing process. It was found that in the aluminized specimens, voids were formed in the vicinity of the substrate/coating interfaces during thermal cyclic heating, whereas secondary diffusion zones (SDZ) were formed by isothermal heating. These different microstructural changes of the aluminized specimens can be explained by the kinetics of diffusion between the coating layer and the substrate during the heating/cooling processes. In the Pt-aluminized specimen, on the other hand, secondary reaction zone (SRZ) formation was observed after both thermal cyclic and isothermal treatments. These results can be explained by the polycrystallization of the substrate surface during the annealing process, which promotes interdiffusion, resulting in the formation of an SRZ.

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“…For instance, an irreversible transformation of b-(Ni,Pt)Al to c'-Ni 3 Al can occur due to the depletion of Al [14]. Since the Pt solubility limit is lower in Ni 3 Al (*32 at.%) than in b-NiAl (*42 at.%) [15], Pt may precipitate out of the Ni 3 Al at high temperatures and the resulting Ni 3 Al has an effect on Pt diffusion.…”

Section: Introductionmentioning

confidence: 99%

Diffusion behaviour of Pt in platinum aluminide coatings during thermal cycles

Chen

Yang

et al. 2017

International Journal of Materials Research

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Two-phase PtAl 2 +b-(Ni,Pt)Al and single-phase b-(Ni,Pt)Al coatings were fabricated on DD5 Ni-based superalloy and pure Ni substrates. A coating/pure Ni substrate system was studied to determine the diffusion behaviour of Pt in the Ni-Al-Pt ternary system. The evolutions of morphology, phases and component concentration during thermal cycles were analysed. It was found that there is a phase shift from PtAl 2 to b* in the two-phase coating, and Kirkendall porosity was observed in the single-phase coating. Our results further indicated that there are two different diffusion paths of Pt in the Ni-Al-Pt system.

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α-NiPt(Al) and phase equilibria in the Ni–Al–Pt system at 1150 °C

Cited by 105 publications

References 16 publications

Study of the Isothermal Oxidation Process and Phase Transformations in B2-(Ni,Pt)Al/RENE-N5 System

Study of the Isothermal Oxidation Process and Phase Transformations in B2-(Ni,Pt)Al/RENE-N5 System

Effect of Thermal History on Microstructural Changes in Aluminized Nickel-Based Single-Crystal Superalloy

Diffusion behaviour of Pt in platinum aluminide coatings during thermal cycles

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