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Double minimum creep processing and mechanism forγ'strengthened cobalt-based superalloy

Journal of Materials Science & Technology 2022年第17期112卷 123-129页

作者： Jia Chen Min Guo Min Yang Lin Liu Jun Zhang State Key Laboratory of Solidification Processing Northwestern Polytechnical UniversityXi’an 710072China

The double minimum creep,characterized by two creep rate minima,in Co-based superalloy is investigated using a phase-field model coupled with a crystal plasticity model.The constitutive modeling,based on the dislocation slip theory considering dislocation interaction,is applied to simulate microstructural evolution and deformation behavior.Rafting process commences at the beginning of creep until the global minimum of creep rate is reached,demonstrating a strengthening effect from N-type rafts under compressive creep.The high shear strain rate of(111)[011]slip system in the intersections of horizontal and verticalγchannels leads to a slight increase of creep rate after the first local minimum.The evolution of stress field shows that the softening effect is the combined effect of the increase of resolved shear stress and the decrease of hardening stress in the intersections.Further,these changes in stress are primarily caused by the dislocation annihilation and the inhomogeneous plastic deformation.This study indicates that the intermediate local softening stage during creep may be eliminated if the initial inter-distance betweenγ’precipitates is decreased.

关键词： Cobalt-based superalloy Phase-field simulation Creep γ’precipitates Slip system

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Lattice mismatch in Ni_(3)Al-based alloy for efficient oxygen evolution

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Journal of Materials Science & Technology 2022年第11期106卷 19-27页

作者： Shicheng Li Hongyan Liang Chong Li Yongchang Liu State Key Lab of Hydraulic Engineering Simulation and Safety School of Materials Science&EngineeringTianjin UniversityTianjin 300354China Key Laboratory of Efficient Utilization of Low and Medium Grade Energy Ministry of EducationTianjin UniversityTianjin 300350China

The Ni_(3)Al-based alloy has been considered as a robust catalyst for oxygen evolution reaction(OER)due to its long-term durability and acceptable activity.However,related reports about understanding the catalytic mechanism are rare and desirable.Herein,the effect of γ/γ’phase lattice mismatch on the catalytic performance caused by various cooling rates after solution heat treatment was investigated.With decreasing cooling rate,the morphologies of γ' precipitates transformed from sphere to cube and the lattice mismatch increased from-0.172%to-0.409%.The increased lattice mismatch facilitated the formation of the active β-NiOOH phase and enhanced the intrinsic catalytic activity,resulting in the optimized OER overpotential of 240 mV at a current density of 10 mA cm^(−2) with a Tafel slope of 66.1 mV dec^(−1) and a stability of 200 h in 1 M KOH.This work reveals the lattice mismatch effect on OER and provides a potential candidate for OER.

关键词： Ni_(3)Al alloy γ’precipitates Annealing Oxygen evolution electrocatalysts

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Effects of helium on irradiation-induced phase instability in a NiCrFeTiNbAl alloy

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Tungsten 2021年第1期3卷 58-64页

作者： He Zhang Zhong-Wen Yao Marquis A.Kirk Department of Mechanical and Materials Engineering Queen’s UniversityKingston K7L 3N6Canada Material Science Division Argonne National LaboratoryArgonneIL 60439USA

The Ni–Fe–Cr based superalloy with percentage additions of Nb,Al and Ti,called"Inconel X750 superalloy",is studied with its importance in nuclear application.Under reactor neutron irradiation,the strengthening phase Ni3(Al,Ti)in the form of gamma prime precipitates were somehow disordered,and dissolved eventually,by which the mechanical properties of materials were degraded.It is of high interests to investigate the e ects of transmutation production helium on radiationinduced instability of gamma prime in the materials.The transmission electron microscope in situ heavy ion irradiations with and without pre-injected helium are performed purposely.The precipitates were disordered by heavy ion irradiation after 0.06 displacement per atom(dpa).The presence of 2×10-4 atoms helium delayed the disordering of Ni3(Al,Ti)precipitates to 0.68 dpa.With 4×10-4 atoms helium,the precipitates required doses of>2.7 dpa to become disordered.In addition,the precipitation of M23C6 particles were observed at 600℃irradiation to 5.4 dpa with 4×10-4 atoms helium pre-injected.

关键词： γ’precipitates Disordering Inconel X-750 Helium pre-injection

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