Rôle of elastic inhomogeneity in the development of cuboidal microstructures in Ni-based superalloys

Cottura, Maeva; Bouar, Y. Le; Appolaire, Benoît; Finel, A.

doi:10.1016/j.actamat.2015.04.034

Cited by 53 publications

(28 citation statements)

References 38 publications

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“…The inhomogeneous and anisotropic elastic constants have been retrieved from [46], where it has been shown that a large inhomogeneity of the shear modulus C = (C 11 − C 12 )/2 is required to generate well-aligned cuboidal precipitates with aspect ratios close to the experimental observations of AM1…”

Section: Physical Properties and Phase Field Parametersmentioning

confidence: 96%

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Coupling the Phase Field Method for diffusive transformations with dislocation density-based crystal plasticity: Application to Ni-based superalloys

Cottura

Appolaire

Finel

et al. 2016

Journal of the Mechanics and Physics of Solids

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Section: Physical Properties and Phase Field Parametersmentioning

confidence: 96%

“…The 2.3×2.3 µm 2 periodic box is discretized with 1024 2 nodes. It has been shown that such discretisation is sufficient to correctly describe the microstructure evolution [59,46]. Starting from an initial disordered γ phase, the alloy is aged during 16 h at 950 • C. The resulting microstructure (Fig.…”

Section: Rafting Of Ni-based Superalloys During Creepmentioning

confidence: 99%

Coupling the Phase Field Method for diffusive transformations with dislocation density-based crystal plasticity: Application to Ni-based superalloys

Cottura

Appolaire

Finel

et al. 2016

Journal of the Mechanics and Physics of Solids

Self Cite

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“…This result indicates that the morphological change might strongly depend on the particle size and is less related to the magnitude or sign of lattice mis t. Moreover, the absolute value of lattice mis t is small ( 0.1%) at high temperature in the alloy. This result might support another dominant factor such as local segregation 37) , elastic constant inhomogeneity [38][39][40] , volume fraction of precipitates, or interfacial energy.…”

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confidence: 89%

Morphology Evolution of γ′ Precipitates during Isothermal Exposure in Wrought Ni-Based Superalloy Inconel X-750

2017

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The morphological evolution of γ ′ precipitates and lattice mis t with isothermal aging were closely investigated in wrought Ni-based superalloy Inconel X-750. The γ ′ morphology dramatically changes in terms of shape, distribution, coalescence and coherency at the γ/γ ′ interface. These processes and their dependence on temperature are summarized as a γ ′ morphology map together with a time-temperature-precipitation (TTP) diagram through quantifying relevant morphological parameters. The lattice mis t was measured by X-ray diffraction and is positive; it decreases from 0.6% at room temperature to 0.1% at the aging temperature. These results suggest that the morphological changes of the γ ′ precipitates are attributable to very low lattice mis t, the interaction of the elastic eld, the volume fraction of the precipitates and incoherence in γ/γ ′ interface.

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“…In this article, we focus on the systematic analysis of the interplay of elastic contributions and the complex interdiffusion on coarsening kinetics. Furthermore, the studies [25][26][27][28] have shown that the elastic inhomogeneity formulation as used in this work is a good first description of the influence of the micro-mechanics on the coarsening kinetics in Ni-base superalloys.…”

Section: Kinetic Equationsmentioning

confidence: 99%

Phase‐Field Study of Anisotropic γ′‐Coarsening Kinetics in Ni‐Base Superalloys with Varying Re and Ru Contents

et al. 2015

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The coarsening kinetics of g 0 -precipitates in single crystalline Ni-based superalloys is studied using phase-field simulations. At first, we discuss interdiffusion-limited g 0 -coarsening in technologically relevant superalloys with the explicit inclusion of up to nine chemical components. The simulations show that an additional influence from the coherency strain leads to a substantially faster coarseningevolution compared to the predictions from the LSW-theory. Second, we perform a virtual experiment to determine the influence of varying rhenium (Re) and ruthenium (Ru) additions on the temporal evolution of the g-g 0 microstructure under thermo-mechanical loads. We observe that a change in the Re content strongly alters the coarsening kinetics. On the contrary, it is found that Ru variations have no significant effect on the coarsening kinetics.

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Rôle of elastic inhomogeneity in the development of cuboidal microstructures in Ni-based superalloys

Cited by 53 publications

References 38 publications

Coupling the Phase Field Method for diffusive transformations with dislocation density-based crystal plasticity: Application to Ni-based superalloys

Coupling the Phase Field Method for diffusive transformations with dislocation density-based crystal plasticity: Application to Ni-based superalloys

Morphology Evolution of γ′ Precipitates during Isothermal Exposure in Wrought Ni-Based Superalloy Inconel X-750

Phase‐Field Study of Anisotropic γ′‐Coarsening Kinetics in Ni‐Base Superalloys with Varying Re and Ru Contents

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