Topologically inverse microstructure in single-crystal superalloys: microstructural stability and properties at ultrahigh temperature

Ru, Yi; Hu, Bin; Zhao, Wenyue; Zhang, Heng; Pei, Yanling; Li, Shusuo; Gong, Shengkai; Xu, Huibi

doi:10.1080/21663831.2021.1982785

Cited by 24 publications

(2 citation statements)

References 50 publications

(48 reference statements)

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“…It can be seen from the figure that the fracture microstructure of the 0.3-0.7 mm thin-walled samples presents a fine γ phase, and γ phase of 0.3 mm and 0.5 mm samples is smaller than that of 0.7 mm samples. This kind of fine γ phase is surrounded by γ' phase, forming many "islands", that is, "Topology inversion" [22]. In the evolution of γ/γ' phase morphology, the volume fraction of γ' raft changes [23].…”

Section: Resultsmentioning

confidence: 99%

Thickness Debit Effect in Creep Performance of a Ni3Al-Based Single-Crystal Superalloy with [001] Orientation

Zhang

Wang

et al. 2023

Crystals

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With the complexity of the structure of aero-engine turbine blades, the blade wall thickness continues to decrease. It is found that when the blade wall thickness decreases to a certain extent, its mechanical properties will decline significantly. It is extremely important to study this phenomenon of a significant decline in mechanical properties caused by wall thickness. In this paper, the creep behavior of a second-generation Ni3Al-based single crystal superalloy with different wall thicknesses and [001] orientation at 980 °C/220 MPa has been studied and compared with the creep life of Φ4 round bar. The experimental results show that the second orientation and the surface affected zone are not the main reasons for the reduction of the life of thin-walled samples under this experimental condition. By analyzing the fracture morphology and deformed microstructure of thin-walled samples with different thicknesses, it is found that the thickness debit effect of the single crystal alloy occurs since the effective stress area of the alloy changes due to internal defects and surface affected zone during the creep process. For thicker samples, the creep life of the alloy can be extended by making the samples undergo certain plastic deformation through better plastic deformation coordination ability, while for thinner samples, the plastic coordination ability is poor, and the ability to extend the creep life through plastic deformation is also weaker when the effective stress area of the alloy changes, which leads to the thinner samples being more prone to fracture.

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Section: Resultsmentioning

confidence: 99%

Thickness Debit Effect in Creep Performance of a Ni3Al-Based Single-Crystal Superalloy with [001] Orientation

Zhang

Wang

et al. 2023

Crystals

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“…In recent years, single crystal superalloys with high Al and Mo contents draw more researchers' attention. These single crystal superalloys usually have higher γ' volume fraction and good creep performance at an ultrahigh temperature [21,22]. Meanwhile, there is a large tendency for the precipitation of the TCP phase in these alloys, since the low γ volume fraction easily leads to supersaturation of refractory elements and the precipitation of the TCP phase.…”

Section: Introductionmentioning

confidence: 99%

Topologically Closed Packed Phase and Its Interaction with Dislocation Movement in Ni–Based Superalloy during High–Temperature Creep

Guo

Zhao

et al. 2022

Crystals

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In superalloys, topologically close–packed (TCP) phases, which contain refractory elements, usually significantly influence the mechanical properties. The current work investigates the structure and composition of the TCP phase in an Al–Mo–rich Ni–based single crystal superalloy. It is shown that after 40 h of thermal exposure, a large number of strip–like TCP phases are formed, which are enriched in Mo and Re. The structure of the TCP phase is identified as the tetragonal σ phase with the lattice parameter a being 0.93 nm and c being 0.50 nm. During the creep process, the single crystal tilts obviously and leads to orientation variation from <1 1 0> direction. Two groups of dislocations are observed in the deformed sample. One group contains straight dislocation lines and another group contains dislocation networks. The interaction between TCP phase and dislocation in the single crystal superalloy is studied to reveal the effect of the TCP phase on the deformation behavior. During creep, the σ phase hinders the dislocation movement, which may contribute to the propagation of the cracks and the final fracture.

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Predicting the oxidation kinetic rate and near-surface microstructural evolution of alumina-forming Ni-based single crystal superalloy based on machine learning

Yang,

Zhao,

et al. 2024

Acta Materialia

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Topologically inverse microstructure in single-crystal superalloys: microstructural stability and properties at ultrahigh temperature

Cited by 24 publications

References 50 publications

Thickness Debit Effect in Creep Performance of a Ni3Al-Based Single-Crystal Superalloy with [001] Orientation

Thickness Debit Effect in Creep Performance of a Ni3Al-Based Single-Crystal Superalloy with [001] Orientation

Topologically Closed Packed Phase and Its Interaction with Dislocation Movement in Ni–Based Superalloy during High–Temperature Creep

Predicting the oxidation kinetic rate and near-surface microstructural evolution of alumina-forming Ni-based single crystal superalloy based on machine learning

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