Unveiling the Re effect on long-term coarsening behaviors of γ′ precipitates in Ni-based single crystal superalloys

Lu, Fan Xiu; Antonov, Stoichko; Lu, Song; Zhang, Jiachen; Li, Longfei; Wang, Dong; Zhang, Jian; Feng, Qiang

doi:10.1016/j.actamat.2022.117979

Cited by 53 publications

(7 citation statements)

References 68 publications

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“…Firstly, it is possible the shape of this profile is indicative of the slow mobility of Ta within the alloy. The slow diffusivity of Ta, results in a decrease in concentration of Ta leading into the interface within the γ', which enables W to replace Ta and substitute onto the Al-sites within the L 12 structure [20]. This theory supports the complementary W profile which shows a slight segregation at the interface on the γ' side of the interface.…”

Section: γ/γ' Interfacial Segregation and Its Effect On Lattice Param...supporting

confidence: 61%

“…The γ/γ' interface plays a pivotal role in determining the microstructure and mechanical properties of these two-phase alloys, but the nanoscale nature of this interface makes it challenging to characterise its composition. Multiple studies have focused in particular on understanding the role of Re, which is believed to be an essential element in stabilizing the interface and influencing the mechanical properties of various alloys [19][20][21][22]. Due to its enhanced spatial and chemical resolution, atom probe tomography (APT) has been increasingly utilised to characterize γ and γ' compositions and γ/γ' interfaces within Ni-based superalloys [16,[23][24][25][26].…”

Section: Introductionmentioning

confidence: 99%

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Effect of Microsegregation and Heat Treatment on Localised Γ and Γ’ Compositions in Single Crystal Ni-Based Superalloys

Strutt

Bagot

Moody

et al. 2023

Preprint

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Section: γ/γ' Interfacial Segregation and Its Effect On Lattice Param...supporting

confidence: 61%

Section: Introductionmentioning

confidence: 99%

Effect of Microsegregation and Heat Treatment on Localised Γ and Γ’ Compositions in Single Crystal Ni-Based Superalloys

Strutt

Bagot

Moody

et al. 2023

Preprint

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“…The kinetics of precipitate coarsening influence the strength of alloys such that this area continues to attract the interests of many researchers. Techniques like solute segregation at precipitate interfaces in Al alloys [2][3][4][5][6], formation of stacking fault ribbons in Ni alloys [7][8][9], introduction of slow diffusing elements in superalloys [10][11][12][13][14], and application of external compressive stresses [15,16] were proposed as measures to retard the precipitate coarsening process. The mechanisms responsible for precipitate coarsening resistance are thermodynamic and kinetic in nature and involve interfacial energy reduction, solute drag against precipitate growth, development of strain fields around growing precipitates, slowing down of solute diffusion [17], etc.…”

Section: Introductionmentioning

confidence: 99%

Modification of Precipitate Coarsening Kinetics by Intragranular Nanoparticles—A Phase Field Study

Fashu

Huang

Wang

2022

Metals

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Precipitate coarsening is a major mechanism responsible for the degradation in mechanical properties of many precipitation-hardened alloys at high temperatures. With recent developments in processing of nanocomposite materials, a substantial volume fraction of inert second phase ceramic nanoparticles can be introduced into the grain interiors of polycrystalline materials. These intragranular nanoparticles can have synergistic effects of impeding dislocation motion and interacting with coarsening precipitates to modify the coarsening rate. In this work, the precipitate coarsening behavior of an alloy in the presence of intragranular inert nanoparticles was studied using the phase field method. Two key measurements of coarsening kinetics, precipitate size distribution and coarsening rate, were found to be affected by the volume fraction and the size of nanoparticles. Two novel mechanisms related to geometric constraints imposed by inter-nanoparticle distance and the blockage of solute diffusion path by nanoparticle–matrix interfaces were proposed to explain the observed changes in precipitate coarsening kinetics. The simulation results in general suggest that the use of small nanoparticles with large number density is effective in slowing down the coarsening kinetics.

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“…Coarsening is not only influenced by the lattice misfit of the alloy but also requires elemental diffusion in the γ phase, which might be slowed down by the addition of Ta. To maintain consistency with the experimental observation that replacing 1 wt.% Ti with 3 wt.% Ta is beneficial to the stability of the shape and size of γ phase during thermal exposure, replacing 1 wt.% Ti with 3 wt.% Ta increases the Re and Mo partitioning into the γ phase, which leads to a slow diffusion rate of the γ phase due to both Re and Mo being slow diffusers [42,43].…”

Section: Microstructural Evolution During Thermal Exposure At 1050 °Cmentioning

confidence: 63%

Microstructure, Mechanical Properties and Thermal Stability of Ni-Based Single Crystal Superalloys with Low Specific Weight

et al. 2023

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Ni-based single crystal (SX) superalloy with low specific weight is vital for developing aero engines with a high strength-to-weight ratio. Based on an alloy system with 3 wt.% Re but without W, namely Ni-Co-Cr-Mo-Ta-Re-Al-Ti, a specific weight below 8.4 g/cm3 has been achieved. To reveal the relationship among the composition, mechanical properties, and thermal stability of Ni-based SX superalloys, SXs with desirable microstructures are fabricated. Tensile tests revealed that the SX alloys have comparable strength to commercial second-generation SX CMSX-4 (3 wt.% Re and 6 wt.% W) and Rene′ N5 alloys (3 wt.% Re and 5 wt.% W) above 800 °C. Moreover, the elongation to fracture (EF) below 850 °C (>20%) is better than that of those two commercial SX superalloys. During thermal exposure at 1050 °C for up to 500 h, the topological close-packed (TCP) phase does not appear, indicating excellent phase stability. Decreasing Al concentration increases the resistance of γ′ rafting and replacing 1 wt.% Ti with 3 wt.% Ta is beneficial to the stability of the shape and size of γ′ phase during thermal exposure. The current work might provide scientific insights for developing Ni-based SX superalloys with low specific weight.

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Unveiling the Re effect on long-term coarsening behaviors of γ′ precipitates in Ni-based single crystal superalloys

Cited by 53 publications

References 68 publications

Effect of Microsegregation and Heat Treatment on Localised Γ and Γ’ Compositions in Single Crystal Ni-Based Superalloys

Effect of Microsegregation and Heat Treatment on Localised Γ and Γ’ Compositions in Single Crystal Ni-Based Superalloys

Modification of Precipitate Coarsening Kinetics by Intragranular Nanoparticles—A Phase Field Study

Microstructure, Mechanical Properties and Thermal Stability of Ni-Based Single Crystal Superalloys with Low Specific Weight

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