Predicting diffusion paths and interface motion in γ/γ + β, Ni-Cr-Al diffusion couples

Nesbitt, James A.; Heckel, R. W.

doi:10.1007/bf02647080

Cited by 34 publications

(18 citation statements)

References 10 publications

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“…In that point of view, Al diffuses uphill faster in Cr-rich systems because the Cr concentration gradient was opposite to the one of Pt in Ni-AlCr-Pt systems [14]. The present observations are in accordance with these previous studies [13,14]. Moreover, the EPMA Cr concentration profiles showed a small peak at around 5 μm below the surface (Fig.…”

Section: Chromium Effectsupporting

confidence: 82%

“…A higher uphill Al diffusion was observed for the Ni-12Al-10Cr/electroplated-Pt with an Al surface concentration of 34 at.% after 15 min. Cr has a positive chemical interaction with Al in Ni-Cr-Al systems [13] and increases the Al activity in the substrate. In that point of view, Al diffuses uphill faster in Cr-rich systems because the Cr concentration gradient was opposite to the one of Pt in Ni-AlCr-Pt systems [14].…”

Section: Chromium Effectmentioning

confidence: 99%

“…It also reduces the Al critical content necessary to sustain the growth of the alumina scale, this effect is known as the "thirdelement effect" [11,12]. In 1987, Nesbitt and Heckel reported that Cr has a positive chemical interaction with Al in the Ni-Al-Cr system [13]. In 2005, Hayashi et al showed that the Cr concentration gradient is opposite to the one of Pt during interdiffusion in the Ni-Al-Cr/Ni-Al-Pt couple [14].…”

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: Chromium Effectsupporting

confidence: 82%

Section: Chromium Effectmentioning

confidence: 99%

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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“…Nesbitt and Heckel [19] modeled the β phase depletion due to interdiffusion in γ/γ+β diffusion couples chosen from the NiCrAl system. Taylor et al [5] modeled the oxidation and interdiffusion of Al in NiCrAl alloys.…”

Section: Introductionmentioning

confidence: 99%

Modeling of microstructural evolution and lifetime prediction of MCrAlY coatings on nickel based superalloys during high temperature oxidation

Yuan

Eriksson

Peng

et al. 2013

Surface and Coatings Technology

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MCrAlY coatings are deposited onto superalloys to provide oxidation and corrosion protection at high temperature by the formation of a thermally grown oxide scale. In this project, the oxidation behaviour of a HVOF CoNiCrAlYSi coating on IN792 was studied for both isothermal oxidation (900, 1000 and 1100 °C) and thermal cycling (100-1100 °C). The microstructural evolution of the CoNiCrAlYSi coatings after oxidation was investigated. It was found that the Al-rich β phase is gradually consumed due to two effects: surface oxidation and coating-substrate interdiffusion. Some voids and oxides along the coating-substrate interface, or inside the coating, were considered to play a role in blocking the diffusion of alloying elements. Based on the microstructural observation, an oxidation-diffusion model, considering both surface oxidation and coating-substrate interdiffusion, was developed by using Matlab and DICTRA software to predict the useful life of MCrAlY coatings.A new concept of diffusion blocking is also introduced into the model to give more accurate description on the microstructural evolution. The results from modeling and the experimentally established composition profiles showed good agreement.

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“…Поэтому была построена двумерная модель [52], в которой диффузия в однофазных областях описывается, как и в первой модели, а в случае захода диффузионного пути в двух-фазную область описание ведется с помощью феноменологиче-ских уравнений массопереноса (37), где потоки определяются через двумерные аналоги уравнений (10). В схеме используются эффек-тивные коэффициенты массопереноса, полученные из модели па-раллельного соединения фаз (15). При этом (14).…”

Section: модели двумерной диффузии в тройных системах с 2-фазными облunclassified

Interdiffusion in Ternary Systems with Two-Phase Zones—Approaches and Models

Lyashenko

2003

Usp. Fiz. Met.

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Проанализированы особенности взаимной диффузии в тройных металли-ческих системах. Сложность теоретического и экспериментального ис-следования взаимной диффузии в многокомпонентных системах связана с возможностью формирования двухфазных зон в результате диффузи-онного взаимодействия в сплавах, имеющих двухфазные области на изо-термической диаграмме состояния. Моделирование взаимной диффузии в тройных системах с двухфазными областями делает возможным опи-сать рост двухфазных зон, определить диффузионный путь и проанали-зировать его стабильность. При различных упрощающих приближениях рассмотрены термодинамические и кинетические подходы, позволяющие решить новые проблемы, связанные с добавкой одного или более компо-нентов в бинарную систему. Среди таких проблем наиболее интересными есть: 1) создание самосогласованной модели построения диаграммы со-стояния и диффузионного взаимодействия с возможностью образования двухфазной зоны; 2) выбор диффузионного пути в концентрационном треугольнике; 3) определение критерия формирования двухфазной зоны; 4) исследование морфологии двухфазной зоны в зависимости от началь-ного состава и диффузионных параметров.Проаналізовані особливості взаємної дифузії в потрійних металевих сис-темах. Складність теоретичного і експериментального дослідження взає-мної дифузії в багатокомпонентних сплавах пов'язана з можливістю фо-рмування двофазних зон внаслідок дифузійної взаємодії в системах, що мають двофазні області на ізотермічній діаграмі стану. Моделювання взаємної дифузії в потрійних системах з двофазними областями робить можливим описати ріст двофазних зон, визначити дифузійний шлях і проаналізувати його стійкість. При різних спрощуючих наближеннях розглянуті термодинамічні та кінетичні підходи, що дозволяють вирі- Fiz. Met. 2003, т. 4, сс. 81-122 Îòòèñêè äîñòóïíû íåïîñðåäñòâåííî îò èçäàòåëÿ Ôîòîêîïèðîâàíèå ðàçðåøåíî òîëüêî â ñîîòâåòñòâèè ñ ëèöåíçèåé 2003 ÈÌÔ (Èíñòèòóò ìåòàëëîôèçèêè èì. Ã. Â. Êóðäþìîâà ÍÀÍ Óêðàèíû) Íàïå÷àòàíî â Óêðàèíå.

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Predicting diffusion paths and interface motion in γ/γ + β, Ni-Cr-Al diffusion couples

Cited by 34 publications

References 10 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

Modeling of microstructural evolution and lifetime prediction of MCrAlY coatings on nickel based superalloys during high temperature oxidation

Interdiffusion in Ternary Systems with Two-Phase Zones—Approaches and Models

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