Observation and modeling of α-NiPtAl and Kirkendall void formations during interdiffusion of a Pt coating with a γ-(Ni-13Al) alloy at high temperature

Audigié, Pauline; Put, Aurélie Rouaix-Vande; Malié, André; Bilhé, Pascal; Hamadi, Sarah; Monceau, Daniel

doi:10.1016/j.surfcoat.2014.08.083

Cited by 21 publications

(21 citation statements)

References 32 publications

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“…2 exhibit X-ray diffraction patterns and backscattered electron (BSE) images of cross-sections of the Ni-12Al-10Cr/ electroplated-Pt system annealed 1 min, 15 min and 60 min at 1100°C under argon. Similar phases than the ones of the Ni-Al-Pt ternary system [5] were observed whatever the duration of the heat treatment was.…”

Section: Materials and Experimentssupporting

confidence: 67%

“…The lattice parameter "a" of the two phases was similar (0.3878 nm and 0.3865 nm for α 1 and α 2 respectively) whereas their lattice parameter "c" differed (0.3586 nm and 0.3635 nm for α 1 and α 2 respectively). As reported in the Ni-Al-Pt system, α-NiPtAl formation was caused by the rapid diffusion toward the surface of Ni and Al [5,28], the uphill Al diffusion being favoured by the decrease in Al activity due to Pt [3].…”

Section: Chromium Effectmentioning

confidence: 67%

“…The fluxes were written as generalized Fick's laws using cross-term diffusion coefficients. More details about the model are given in a previous publication [5]. Fig.…”

Section: Materials and Experimentsmentioning

confidence: 99%

“…Full interpretation of the Pt effect is partly hindered by the effect of the other alloying elements. In that respect, the effect of Pt during fabrication was analysed in a preliminary study [5] by performing interdiffusion experiments at 1100°C between a Pt coating and an Alrich γ-Ni model alloy. In this previous work, the rapid formation and dissolution of the α-NiPtAl phase was evidenced.…”

Section: Introductionmentioning

confidence: 99%

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Chromium and iridium effects on the short-term interdiffusion behaviour between Pt rich γ-γ′ bond-coatings and a Ni-Al-Cr alloy

Audigié

Put

Murakami

et al. 2017

Surface and Coatings Technology

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To cite this version:Pauline Audigié, Aurélie Rouaix-Vande Put, Hideyuki Murakami, Daniel Monceau. Chromium and iridium effects on the short-term interdiffusion behaviour between Pt rich γ-γ' bond-coatings and a Ni-Al-Cr alloy. Surface and Coatings Technology, Elsevier, 2017, 309, pp.258-265. 10.1016/j.surfcoat.2016 Open Archive TOULOUSE Archive Ouverte (OATAO) OATAO is an open access repository that collects the work of Toulouse researchers and makes it freely available over the web where possible. Al and with Cr in such a way that Pt decreased their activities. According to the diffusion coefficient values, Pt had a greater influence on the Al activity than on the Cr one. Similarly, 2 μm of Pt and 3 μm of Pt-25Ir were deposited by electroplating on the same model alloy to investigate the effect of Ir. Heat treatments were performed in the same conditions as for Cr. Iridium slowed down the interdiffusion when compared with systems with Pt only. Iridium diffused slower toward the substrate than Pt and a lower Pt + Ir flux toward the substrate was found.As voids formed at the interdiffusion zone/substrate interface due to Kirkendall effect, this lower inward Pt + Ir flux resulted in a lower outward vacancy flux and then Ir reduced Kirkendall voids formation. Moreover, Ir decreased the Pt effect on Al activity by dilution or even gave an opposite contribution to the Pt one. This reduced the uphill diffusion of Al, delaying the α-NiPtAl phase formation. Diffusion paths of each model system were also identified after 15 min at 1100°C and all highlighted the α-NiPtAl phase formation and its aptitude to be used in TBC systems.

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Section: Materials and Experimentssupporting

confidence: 67%

Section: Chromium Effectmentioning

confidence: 67%

“…The fluxes were written as generalized Fick's laws using cross-term diffusion coefficients. More details about the model are given in a previous publication [5]. Fig.…”

Section: Materials and Experimentsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Chromium and iridium effects on the short-term interdiffusion behaviour between Pt rich γ-γ′ bond-coatings and a Ni-Al-Cr alloy

Audigié

Put

Murakami

et al. 2017

Surface and Coatings Technology

Self Cite

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“…Second, the diffusion of Ni from the substrate to the outer layer is weak and the replenishment of Ni is not sufficient. Audigié et al suggested that the void location corresponds to the Al depletion zone (or the Pt diffusion front) [29]. However, no voids were observed in the two-phase coating.…”

Section: Discussionmentioning

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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Mechanical and oxidation resistance of remanufactured NiCoCrAlYTa coating deposited via arc ion plating

et al. 2022

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Observation and modeling of α-NiPtAl and Kirkendall void formations during interdiffusion of a Pt coating with a γ-(Ni-13Al) alloy at high temperature

Abstract: OATAO is an open access repository that collects the work of Toulouse researchers and makes it freely available over the web where possible.

Cited by 21 publications

References 32 publications

Chromium and iridium effects on the short-term interdiffusion behaviour between Pt rich γ-γ′ bond-coatings and a Ni-Al-Cr alloy

Chromium and iridium effects on the short-term interdiffusion behaviour between Pt rich γ-γ′ bond-coatings and a Ni-Al-Cr alloy

Diffusion behaviour of Pt in platinum aluminide coatings during thermal cycles

Mechanical and oxidation resistance of remanufactured NiCoCrAlYTa coating deposited via arc ion plating

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