Design for anomalous yield in γ′-strengthening superalloys

Ru, Yi; Zhao, Haigen; Zhang, Heng; Pan, Xiaotian; Zhao, Wenyue; Pei, Yanling; Li, Shusuo; Gong, Shengkai

doi:10.1016/j.matdes.2019.108082

Cited by 16 publications

(2 citation statements)

References 31 publications

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“…A quinary single-crystal model superalloy is developed from our previous works [29][30][31], where one 3 w.t.% Re-containing alloy exhibits 1200°C/ 80 MPa creep life longer than 110 h. This work chooses an alloy termed Alloy SMSC (Standard Microstructure Single Crystal), with the chemical composition (weight percent) of (7.5-7.9) Al-(9.3-9.9) Mo-(2.9-3.3) Ta-(1.2-1.5) Rebal. Ni.…”

Section: Methodsmentioning

confidence: 99%

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

Zhao

et al. 2021

Materials Research Letters

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Topological phase inversion, in which γ '-precipitate becomes topological matrix phase, is a typical 'detrimental' microstructural degradation in Ni-based single-crystal superalloys. Here, a topologically inverse structure without service-induced damages is proposed. This structure exhibits excellent stress rupture properties at 1200°C and great microstructural stability, characterized by high, steady two-phase interface density. The relationship of the interface density to microscopic dislocation motion and macroscopic plastic deformation has been established, which reveals possible strengthening effect. These results will help understanding the benefit from this 'degraded' but quite stable microstructure and guide microstructure tuning against long-termed heat-resisted service. IMPACT STATEMENTTopological phase inversion achieved after heat treatment exhibits great microstructural stability and enhanced 1200°C stress rupture properties of single-crystal superalloys. The mechanism behind this beneficial effect is uncovered.

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Section: Methodsmentioning

confidence: 99%

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

Zhao

et al. 2021

Materials Research Letters

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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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An explainable machine learning model for superalloys creep life prediction coupling with physical metallurgy models and CALPHAD

Huang

Liu

Zhu

et al. 2023

Computational Materials Science

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Design for anomalous yield in γ′-strengthening superalloys

Cited by 16 publications

References 31 publications

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

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

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

An explainable machine learning model for superalloys creep life prediction coupling with physical metallurgy models and CALPHAD

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