Atom probe tomography of secondary γ′ precipitation in a single crystal Ni-based superalloy after isothermal aging at 1100°C

Tan, Xipeng; Mangelinck, Dominique; Perrin-Pellegrino, Carine; Rougier, Luc; Gandin, Charles‐André; Jacot, Arthur Paul; Ponsen, Damien; Jaquet, Virginie

doi:10.1016/j.jallcom.2014.05.132

Cited by 36 publications

(9 citation statements)

References 27 publications

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“…However, a previous study comparing experimental compositions from APT to equilibrium predictions by ThermoCalc did not find the Mo content in the γ′ to be as high as the present study. [46] It has been shown previously that the composition of γ′ precipitates is dependent on size within the range of 5 nm to 3 μm. [25] In the present study, no link was found between the size of the γ′ precipitates within each size distribution and the composition.…”

Section: B Precipitate Compositionmentioning

confidence: 94%

“…For example, it has been shown that a sharper interface results from slower cooling rates in AM1. [46] The relative magnitudes of the interfacial width differ for each element, with the faster diffusing species, Al and Ti, exhibiting narrower interfaces than those that diffuse more slowly. This is particularly notable for Mo, which displays the widest interface despite having the smallest difference in concentration between the γ and γ′ phases.…”

Section: B Precipitate Compositionmentioning

confidence: 99%

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Gamma Prime Precipitate Evolution During Aging of a Model Nickel-Based Superalloy

Goodfellow

Galindo-Nava

Christofidou

et al. 2017

Metall Mater Trans A

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The microstructural stability of nickel-based superalloys is critical for maintaining alloy performance during service in gas turbine engines. In this study, the precipitate evolution in a model polycrystalline Ni-based superalloy during aging to 1000 hours has been studied via transmission electron microscopy, atom probe tomography, and neutron diffraction. Variations in phase composition and precipitate morphology, size, and volume fraction were observed during aging, while the constrained lattice misfit remained constant at approximately zero. The experimental composition of the γ matrix phase was consistent with thermodynamic equilibrium predictions, while significant differences were identified between the experimental and predicted results from the γ′ phase. These results have implications for the evolution of mechanical properties in service and their prediction using modeling methods.

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Section: B Precipitate Compositionmentioning

confidence: 94%

Section: B Precipitate Compositionmentioning

confidence: 99%

Gamma Prime Precipitate Evolution During Aging of a Model Nickel-Based Superalloy

Goodfellow

Galindo-Nava

Christofidou

et al. 2017

Metall Mater Trans A

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“…The high spatial resolution and 3D analysis also allows detailed investigation of nanoscale tertiary c¢ precipitates, as well as c-c¢ interfaces. [26] …”

Section: Introductionmentioning

confidence: 99%

Characterization of Phase Chemistry and Partitioning in a Family of High-Strength Nickel-Based Superalloys

Lapington

Crudden

Reed

et al. 2018

Metall Mater Trans A

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A family of novel polycrystalline Ni-based superalloys with varying Ti:Nb ratios has been created using computational alloy design techniques, and subsequently characterized using atom probe tomography and electron microscopy. Phase chemistry, elemental partitioning, and c¢ character have been analyzed and compared with thermodynamic predictions created using Thermo-Calc. Phase compositions and c¢ volume fraction were found to compare favorably with the thermodynamically predicted values, while predicted partitioning behavior for Ti, Nb, Cr, and Co tended to overestimate c¢ preference over the c matrix, often with opposing trends vs Nb concentration.

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“…Hence, the partially ordered diffuse interface is a diffusion bottleneck. The width of this structurally diffuse region depends on the precipitate size [31] and, as documented by atom probe tomography (APT), the rate of cooling after aging [33] and the isothermal aging time [34,35]. A temperature and composition dependency of the interface width has been reported recently [36].…”

Section: Resultsmentioning

confidence: 99%

Fine Precipitates in Nickel Base Superalloys

Balikci

Altincekic

2019

J. Mater. Sci. Technol. Res.

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Presence of fine, secondary/tertiary precipitates in superalloys improves especially the creep-fatigue properties of these alloys. It is conveniently accepted that the fine precipitates form non-isothermally, for example, during cooling from an aging temperature or isothermally during a secondary, lower temperature aging. In the current study, several single-aging treatments were conducted to assess the formation of the fine precipitates in the polycrystalline, nickel-base superalloy IN738LC. The agings were carried out stress-free at 950 o C, 1050 o C, 1120 o C, and 1140 o C for various times. Stressed agings at 950 o C and 1050 o C were also conducted. A time-dependent isothermal formation of the fine precipitates was observed. The formation time decreased as the aging temperature increased. It is suggested that dissolution of some coarse precipitates, evolution of the precipitate-matrix interface toward a fully faceted one, and increased matrix channel width saturate the channels and control the formation of the fine precipitates.

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Atom probe tomography of secondary γ′ precipitation in a single crystal Ni-based superalloy after isothermal aging at 1100°C

Cited by 36 publications

References 27 publications

Gamma Prime Precipitate Evolution During Aging of a Model Nickel-Based Superalloy

Gamma Prime Precipitate Evolution During Aging of a Model Nickel-Based Superalloy

Characterization of Phase Chemistry and Partitioning in a Family of High-Strength Nickel-Based Superalloys

Fine Precipitates in Nickel Base Superalloys

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