Stacking‐fault energy at room temperature of the γ matrix of the MC2 Ni‐based superalloy

Benyoucef, Mustafa; Décamps, B.; Coujou, A.; Clément, N.

doi:10.1080/01418619508236228

Cited by 41 publications

(12 citation statements)

References 25 publications

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“…[19] Common alloying elements in Ni-based superalloys, especially Cr, Co, and W, reduce the SFE of nickel significantly. [20,21] From the chemistry of the alloy indicated in Table I, as well as SFE data from other Ni-based superalloys, [20] it is reasonable to presume that SFE of the c matrix in alloy 720Li is much lower than that of pure Ni, explaining the observed deviation at low strains.…”

Section: B Strain Hardening and Plastic Flowmentioning

confidence: 98%

Tensile Properties of Ni-Based Superalloy 720Li: Temperature and Strain Rate Effects

Gopinath

Gogia

Kamat

et al. 2008

Metall Mater Trans A

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Tensile properties, deformation, and fracture behavior of a wrought nickel-base superalloy 720Li have been studied in standard solutionized and two-stage-aged condition in the temperature range of 25°C to 750°C. Effect of strain rate on tensile behavior was assessed at 25°C, 400°C, and 750°C at five strain rates that range between 10 -5 s -1 and 10 -1 s -1 . The yield strength and ultimate tensile strength of the alloy remained unaffected by temperature until about 600°C and 500°C, respectively, typical of superalloys strengthened by fine and coherent intermetallic Ni 3 Al-based precipitates. The flow stress of the alloy was found to be insensitive to the strain rates studied at 25°C and 400°C. However, at 750°C, the flow stresses showed strain rate sensitivity at strain rates <10 -3 s -1 . The strain hardening behavior at 25°C and 400°C were similar. At 750°C, stain hardening was observed only at strain rates >10 -3 s -1 , and at lower strain rates, tensile instability was seen to set in immediately after yielding. The alloy exhibited ductile dimple fracture at all the temperatures and strain rates studied. Microstructural investigations indicate that in regimes where flow stresses are insensitive to strain rate, deformation occurs through heterogeneous planar slip, whereas in strain rate sensitive regimes, thermally activated diffusion processes promote homogeneous deformation.

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Section: B Strain Hardening and Plastic Flowmentioning

confidence: 98%

Tensile Properties of Ni-Based Superalloy 720Li: Temperature and Strain Rate Effects

Gopinath

Gogia

Kamat

et al. 2008

Metall Mater Trans A

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“…Some authors [35,[38][39][40][41][42] have indicated that the stacking fault energy is strongly influenced by alloying. In Table 3, the measured values of stacking fault energy and the composition of different Ni alloys and pure Ni are listed.…”

Section: Reasons For Solid-solution Strengtheningmentioning

confidence: 99%

“…Stacking fault energies and composition of different Ni alloys and pure Ni taken from the literature[35,[38][39][40][41][42].…”

mentioning

confidence: 99%

Quantitative experimental determination of the solid solution hardening potential of rhenium, tungsten and molybdenum in single-crystal nickel-based superalloys

et al. 2015

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The solid-solution hardening potential of the refractory elements rhenium, tungsten and molybdenum in the matrix of single-crystal nickel-based superalloys was experimentally quantified. Single-phase alloys with the composition of the nickel solid-solution matrix of superalloys were cast as single crystals, and tested in creep at 980°C and 30-75 MPa. The use of single-phase single-crystalline material ensures very clean data because no grain boundary or particle strengthening effects interfere with the solid-solution hardening. This makes it possible to quantify the amount of rhenium, tungsten and molybdenum necessary to reduce the creep rate by a factor of 10. Rhenium is more than two times more effective for matrix strengthening than either tungsten or molybdenum. The existence of rhenium clusters as a possible reason for the strong strengthening effect is excluded as a result of atom probe tomography measurements. If the partitioning coefficient of rhenium, tungsten and molybdenum between the c matrix and the c 0 precipitates is taken into account, the effectiveness of the alloying elements in two-phase superalloys can be calculated and the rhenium effect can be explained.

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“…-Using different methods the stacking fault energy (S.F.E.) at room temperature, of they phase was determined [8]. A mean value 03B3i ~ 21 mJ/m2 was obtained in the frame of elastic isotropy.…”

Section: Introductionmentioning

confidence: 99%

“…As summed up in Table II, an increase of the solute content in pure nickel induces a reduction of the corresponding S.FE. [8]:…”

Section: Introductionmentioning

confidence: 99%

Local Order and Associated Deformation Mechanisms in the γ Phase of Nickel Base Superalloys

Clément

Coujou

Calvayrac

et al. 1996

Microsc. Microanal. Microstruct.

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Abstract. 2014 Using X-ray diffraction, atom probe nanoanalysis, TE.M. associated with in situ deformation, the presence of local order in the 03B3 matrix of a monocrystalline MC2 superalloy is demonstrated. In Ni2CoCr the model alloy of this phase, as well as in the 03B3 MC2 matrix, the existence at room temperature of a strong short range order of {11/2 0} special point type is emphasized. It induces high friction stresses opposing the movement of dislocations which have to propagate in planar arrays in the corresponding materials. In addition, long range ordered L12 hyperfine precipitates appear in the 03B3 MC1 samples annealed at 750 °C. They induce several pairs of dislocations at the head of the moving pile-ups in order to cut them.

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Stacking‐fault energy at room temperature of the γ matrix of the MC2 Ni‐based superalloy

Cited by 41 publications

References 25 publications

Tensile Properties of Ni-Based Superalloy 720Li: Temperature and Strain Rate Effects

Tensile Properties of Ni-Based Superalloy 720Li: Temperature and Strain Rate Effects

Quantitative experimental determination of the solid solution hardening potential of rhenium, tungsten and molybdenum in single-crystal nickel-based superalloys

Local Order and Associated Deformation Mechanisms in the γ Phase of Nickel Base Superalloys

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