The measurement of precipitate/matrix lattice mismatch in nickel-base superalloys

Ecob, R. C.; Ricks, R. A.; Porter, Angus

doi:10.1016/0036-9748(82)90461-6

Cited by 66 publications

(26 citation statements)

References 9 publications

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“…This composition lies within the range of current, high-strength polycrystalline Ni-based superalloys, such as RR1000, [10] and is intended to have low lattice misfit between the γ matrix and γ′ precipitate phases at room temperature, comparable to certain commercial disk alloys. [11,12] The alloy was manufactured through vacuum induction melting (VIM) using elements of ≥ 99.9 pct. purity and cast into 10 mm-diameter cylindrical bars using steel molds.…”

Section: Methodsmentioning

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 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: Methodsmentioning

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 previous studies on this alloy [2,4] revealed that depending upon the time and temperature of exposure M 23 C 6 , M 6 C, MC carbide ('M' is rich in Ni, Nb and Mo), γ″ [Ni 3 (Nb, Al, Ti)] and Ni 2 (Cr, Mo) precipitate in this alloy system. Among these precipitates, γ″ has body centered tetragonal DO 22 structure and Ni 2 (Cr, Mo) possesses orthorhombic Pt 2 Mo type structure.…”

Section: Introductionmentioning

confidence: 87%

“…Lattice misfit measurement between the precipitates and the matrix is common in Nickel base superalloys [6][7][8]. Various techniques like X-ray diffraction (XRD), neutron diffraction (ND) and Convergent Beam Electron Diffraction (CBED) have been used for this purpose.…”

Section: Introductionmentioning

confidence: 99%

Lattice Misfit Measurement in Inconel 625 by X-Ray Diffraction Technique

Sarkar

Mukherjee

Barat

et al. 2008

Int. J. Mod. Phys. B

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Determination of lattice misfit and microstructural parameters of the coherent precipitates in Ni based alloy Inconel-625 is a challenging problem as their peaks are completely overlapping among themselves and also with the matrix. We have used a novel X-ray diffraction technique on the bulk samples of Inconel 625 at different heattreated conditions to determine the lattice parameters, the lattice misfit of the coherent precipitates with the matrix and their microstructural parameters like size and strain.

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“…Although, the strength of nickel-base superalloys is from solid-solution strengthening of substitutional atoms within the face centered cubic nickel rich matrix, the main strength comes from the Ni3 (Al, Ti,) intermetallic precipitate phase, which is coherent within the matrix [12] [13]. This phase has the ordered FCC-L12 structure such as Cu3Au-type, where the centers of the cube faces occupy by the nickel atoms and the corners of the cube occupy by (Al or Ti) atoms with suitable shape, size and volume fraction [22].…”

Section: Nickel-base Superalloys: Chemistry and Microstructurementioning

confidence: 99%

“…slip system between the γ and γ' phases [22] [26]. The APB energy can be altered by changing the structure of the γ and γ' phases and this can be achieved by the addition of alloying elements to the matrix.…”

Section: Gamma Prime Phase (γ')mentioning

confidence: 99%