Accelerating the discovery of novel γ/γ' Co-based superalloys by probing temperature and alloying effects on the γ' precipitates

Xu, Weiwei; Xiong, Zecheng; Gong, Xiaoguo; Yin, Guohui; Chen, L.J.; Wang, C.P.; Liu, X.J.

doi:10.1016/j.mtla.2021.101171

Cited by 11 publications

(4 citation statements)

References 51 publications

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“…The experimentally observed L12-Co3(Al, Nb) precipitates are in line with the recent theoretical first-principle calculations which indicated that the L12-type Co3(Al0.5, Nb0.5) phase exhibited the lowest formation energy among several transition-metal-stabilized L12-type Co3(Al0.5, TM0.5) (TM = Nb, Cr, Re, V, Ti, Ta, W, Mo) intermetallic phases at 0 K [16]. In other words, Nb is the most favorable element in enhancing the stability of the L12 structure.…”

Section: Phase Stability Of the L12-type Co3(al Nb) Intermetallic Phasesupporting

confidence: 89%

“…Noticeably, as a transition element from the VB group, niobium (Nb) is expected to promote L12 ordering in the Co-based alloys along this line of thought. In fact, the feasibility of forming the L12-type Co3(Al, Nb) phase has been reported in a recent DFT study [16]. Another earlier work also indicated that the L12-Co3(Al, Nb) intermetallic compound was more stable than the D019-type intermetallic phase [17].…”

Section: Introductionmentioning

confidence: 78%

“…Moreover, the L12 phase can be further stabilized by the entropy contribution at finite temperatures when taking entropy contributions (e.g., lattice vibration, thermal electronic excitation, and mixing configuration) into consideration [16]. Given the fact that the composition of the current Co3(Al, Nb) strengthener differs from the stoichiometric ratio as used in the recent first principle study, we further investigate the effect of elemental concentrations on the phase stability of the newly-found L12-Co3(Al, Nb) phase.…”

Section: Phase Stability Of the L12-type Co3(al Nb) Intermetallic Phasementioning

confidence: 99%

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L12-strengthened multicomponent Co-Al-Nb-based alloys with high strength and matrix-confined stacking-fault-mediated plasticity

Cao

et al. 2022

Acta Materialia

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Section: Phase Stability Of the L12-type Co3(al Nb) Intermetallic Phasesupporting

confidence: 89%

Section: Introductionmentioning

confidence: 78%

Section: Phase Stability Of the L12-type Co3(al Nb) Intermetallic Phasementioning

confidence: 99%

See 1 more Smart Citation

L12-strengthened multicomponent Co-Al-Nb-based alloys with high strength and matrix-confined stacking-fault-mediated plasticity

Cao

et al. 2022

Acta Materialia

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“…Beforehand, Ni-based superalloys are the most successfully applied superalloys in this field (Pandey et al, 2021). Due to the not quite high melting point, improvement in the high temperature bearing capacity of Ni-based superalloys is severely restricted (Gao et al, 2021c;Xu et al, 2021a;Xu et al, 2021b). Traditional Co-based superalloys are dependent on solution strengthening and carbide strengthening, and lack of ordered L1 2 -γ′ phase precipitation strengthening widely present in Ni-based superalloys, which results in poor mechanical properties at high temperatures (Feng et al, 2021;Lu et al, 2021).…”

Section: Introductionmentioning

confidence: 99%

Coarsening Evolution of γ′ Phase and Failure Mechanism of Co-Ni-Al-Ti-Based Superalloys During Isothermal Aging

et al. 2022

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Novel Co-based superalloys, as potentially ideal aero-engine hot section materials, have a higher temperature bearing capacity and better oxidation resistance than Ni-based superalloys. Coarsening evolution of γ′ phase and failure mechanism of Co-Ni-Al-Ti-based superalloys during the isothermal aging process at 1073 K were investigated using multiple characterizations and testing methods. The results show that γ′ phase is uniformly distributed on the γ phase matrix, and coarsening with the increase in isothermal aging time, which results in a decrease in maximum tensile strength. Furthermore, Mo element is preferred to distribute in γ′ phase and provides stronger solution strengthening effect than Cr element, which determines more excellent mechanical properties of 2Mo superalloy than that of 2Cr superalloy. The coarsening rate of γ′ phase in the 2Cr superalloy is significantly higher than that in the 2Mo superalloy. Grain boundary failure is dominant in isothermal aging, and the cracks nucleate and expand along the vertical direction of loading stress on the grain boundary. The current work suggests that the coarsening of the γ′ phase, reduction in the volume fraction of γ′ phase, and formation of ′-precipitate depleted zone (PDZ) near the grain boundary during aging controls the deterioration of mechanical properties in Co-Ni-Al-Ti-based superalloys.

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Overview of the Development of L12 γ′-Strengthened Cobalt-Base Superalloys

Xu¹

2022

Materials Horizons: From Nature to Nanomaterials

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Accelerating the discovery of novel γ/γ' Co-based superalloys by probing temperature and alloying effects on the γ' precipitates

Cited by 11 publications

References 51 publications

L12-strengthened multicomponent Co-Al-Nb-based alloys with high strength and matrix-confined stacking-fault-mediated plasticity

L12-strengthened multicomponent Co-Al-Nb-based alloys with high strength and matrix-confined stacking-fault-mediated plasticity

Coarsening Evolution of γ′ Phase and Failure Mechanism of Co-Ni-Al-Ti-Based Superalloys During Isothermal Aging

Overview of the Development of L12 γ′-Strengthened Cobalt-Base Superalloys

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