The promotion of Ru on topologically close-packed phase precipitation in the high Cr-containing (∼9wt.%) nickel-base single crystal superalloy

Lv, Xianzi; Zhang, Jianxin; Feng, Qiang

doi:10.1016/j.jallcom.2015.07.055

Cited by 23 publications

(5 citation statements)

References 18 publications

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“…38,39 Once again, the mechanism behind this is not clear. Chen et al 38 attributed it to an increase in the partitioning of Re and Cr to the γ phase, whereas Lv et al 39 observed reverse partitioning of Cr and Co and attributed the increase in TCP precipitation to Ru causing an increase of the diffusion coefficients of TCP-forming elements. However, the former investigated alloys containing ∼5.5 wt.% Cr and ∼5 wt.% Ru whilst the latter used alloys containing ∼9 wt.% Cr and ∼3 wt.% Ru.…”

Section: Comentioning

confidence: 99%

“…In contrast to the previously mentioned suppressant effect, it has been observed that, in some high Cr (>5 wt-%) alloys the addition of Ru can instead cause an increase in TCP precipitation. 38,39 Once again, the mechanism behind this is not clear. Chen et al 38 attributed it to an increase in the partitioning of Re and Cr to the γ phase, whereas Lv et al 39 observed reverse partitioning of Cr and Co and attributed the increase in TCP precipitation to Ru causing an increase of the diffusion coefficients of TCP-forming elements.…”

Section: Effect Of Individual Elementsmentioning

confidence: 99%

Section: Factors Affecting the Precipitation Of Tcp Phasesmentioning

confidence: 99%

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Formation and effect of topologically close-packed phases in nickel-base superalloys

Wilson

2017

Materials Science and Technology

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The formation of topologically close-packed (TCP) phases in nickel-base superalloys is an issue of increasing importance as alloys are designed with higher refractory element contents to meet the requirements of next generation turbine engines. This review considers the factors that affect an alloy's susceptibility to TCP formation. In particular, the debate surrounding the effect of certain individual elements, such as Co and Re, in promoting or suppressing TCP formation is examined alongside the various mechanisms that have been proposed to account for this behaviour. In addition, the detrimental effects of these phases on the alloy's mechanical properties are discussed, including crack initiation at precipitates, depletion of solid solution strengthening refractory elements and the effect on γ/γʹ rafting behaviour.

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Section: Comentioning

confidence: 99%

Section: Effect Of Individual Elementsmentioning

confidence: 99%

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Formation and effect of topologically close-packed phases in nickel-base superalloys

Wilson

2017

Materials Science and Technology

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“…Adding Mo will cause the local lattice distortion of the γ phase, generating a large stress field and hindering the movement of dislocations, thereby achieving a solid solutionstrengthening effect [14][15][16][17]. The Ru element can suppress the precipitation of harmful phases in the matrix, reducing the occurrence of cracks and thereby improving the high-temperature structural stability of the alloy [18][19][20][21].…”

Section: Introductionmentioning

confidence: 99%

Possibility and stabilizing effect of Mo clusters in the Ni-based single-crystal superalloy

Du,

Jin,

Kang

et al. 2024

Commun. Theor. Phys.

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Nickel-based single-crystal superalloys are crucial materials for the preparation of aero-engine turbine blades. Many solute elements are added to superalloys for strengthening. However, the relationship between the clustering behavior of solute atoms and the properties of nickel-based single-crystal superalloys is still unclear. Herein, we conduct first-principles calculations on γ phases with Mo−Mo and Mo−Mo−Ru clusters to reveal the possibility and stabilizing mechanism of solute clusters. Introducing Mo lowers the total energy, binding energy, and formation energy of the γ phase due to the replacement of weak Ni−Ni interaction with strong Mo−Ni bonding. Note that the γ phase containing the Mo−Mo cluster is more stable than that containing Mo single atom, possibly owing to a wide affecting range. Ru atom added to γ phase can further boost system stability, and it tends to form a Mo−Mo−Ru cluster. The stabilizing impact of the Mo−Mo−Ru cluster is demonstrated to be the replacement of weak Ni−Mo interaction by the strong Ru−Mo interaction, which may be derived from the enhanced d-orbital hybridization.

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“…Such defects led to crack initiation in the as-cast Ni-W-Co matrix alloy developed via vacuum induction melting (Zhao et al , 2021). Most researchers (Shu et al , 2018; Tang et al , 2019; Shu et al , 2017; Lv et al , 2015; Pröbstle et al , 2016; Qin et al , 2017; Antonov et al , 2017; Kear and Pope, 1989; Babalola et al , 2020b) have reported on the corrosion, oxidation and phase strengthening effect of these refractory elements in nickel-based superalloys. A report on the investigation of the oxidation behaviour of Ni-Cr binary alloys, with a different range of Cr additions in a CO 2 environment, indicated the formation of chromia scale at higher Cr content (Xie et al , 2017).…”

Section: Introductionmentioning

confidence: 99%

Mechanical and tribological studies of sintered nickel-based ternary alloys

Babalola

Akinribide

Akinwamide

et al. 2021

WJE

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Purpose During the operation of nickel-based alloys as blades and discs in turbines, the sliding activity between metallic surfaces is subjected to structural and compositional changes. In as much as friction and wear are influenced by interacting surfaces, it is necessary to investigate these effects. This study aims to understand better the mechanical and tribological characteristics of Ni-17Cr-10X (X = Mo, W, Ta) ternary alloy systems developed via spark plasma sintering (SPS) technique. Design/methodology/approach Nickel-based ternary alloys were fabricated via SPS technique at 50 MPa, 1100 °C, 100 °C/min and a dwell time of 10 mins. Scanning electron microscopy, X-Ray diffraction, energy dispersive X-ray spectroscopy, nanoindentation techniques and tribometer were used to assess the microstructure, phase composition, elemental dispersion, mechanical and tribological characteristics of the sintered nickel-based alloys. Findings The outcome of the investigation showed that the Ni-17Cr10Mo alloy exhibited the highest indentation hardness value of 8045 MPa, elastic modulus value of 386 GPa and wear resistance. At the same time, Ni-17Cr10W possessed the least mechanical and wear properties. Originality/value It can be shown that the SPS technique is efficient in the development of nickel-based alloys with good elemental distribution and without defects such as segregation of alloying elements, non-metallic inclusions. This is evident from the scanning electron microscopy micrographs.

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The promotion of Ru on topologically close-packed phase precipitation in the high Cr-containing (∼9wt.%) nickel-base single crystal superalloy

Cited by 23 publications

References 18 publications

Formation and effect of topologically close-packed phases in nickel-base superalloys

Formation and effect of topologically close-packed phases in nickel-base superalloys

Possibility and stabilizing effect of Mo clusters in the Ni-based single-crystal superalloy

Mechanical and tribological studies of sintered nickel-based ternary alloys

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