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Orientation-Dependent Morphology and Evolution of interfacial dislocation networks in Ni-Based Single-Crystal Superalloys:A Molecular Dynamics Simulation

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Acta Mechanica Solida Sinica 2021年第1期34卷 79-90页

作者： Bin Chen Wen-Ping Wu Ming-Xiang Chen Department of Engineering Mechanics School of Civil EngineeringWuhan UniversityWuhan430072China State Key Laboratory of Water Resources and Hydropower Engineering Science Wuhan UniversityWuhan430072China

In this paper,the morphology and evolution of interfacial dislocation networks of(100),(110)and(111)interphases of Ni-based single-crystal superalloys are studied by molecular dynamics(MD)***-dimensional cubic-type and sandwich-type models are chosen to explore the orientation-dependent morphology of dislocation networks,and their respective advantages and disadvantages are *** the simulations,it is observed that various lattice orientations and model types lead to different morphologies of dislocation *** on the analysis of average atomic energy and dislocation characteristics,the(100)orientation model has a more regular dislocation network,lower energy and better stability than the(110)and(111)orientation models after MD relaxation,which are supported by previous experimental and numerical ***,the cubic-type model has lower energy and better stability than the sandwich-type *** will be helpful for choosing a more appropriate and reasonable model for simulating the interfacial dislocation networks of Ni-based single-crystal superalloys.

关键词： Ni-based single-crystal superalloys Molecular dynamics simulation Orientation interfacial dislocation networks

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Influence of Ta/Al ratio on the microstructure and creep property of a Ru-containing Ni-based single-crystal superalloy

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Journal of Materials Science & Technology 2021年第30期89卷 16-23页

作者： Wei Song Xinguang Wang Jinguo Li Jie Meng Yanhong Yang Jinlai Liu Jide Liu Yizhou Zhou Xiaofeng Sun Shi-changxu Innovation Center for Advanced Materials Superalloys DivisionInstitute of Metal ResearchChinese Academy of SciencesShenyang 110016China School of Materials Science and Engineering University of Science and Technology of ChinaShenyang 110016China

Two alloys with different Ta and Al contents were applied to study the influence of Ta/Al ratio on the microstructural evolution and creep deformation under high *** increase of Ta/Al ratio made theγ/γ'lattice misfit more negative and enhanced the volume fraction ofγ'phase,which produced cubic and smallγ'phase in the initial *** initial tinyγ'phases impeded the dislocations movement and delayed the course of complete raftedγ'phase during the origination of creep deformation,which prolonged the time of the primary creep ***,the increase of Ta/Al ratio and addition of Ru produced the denser and stable dislocation networks,the high APB energy and better solution strengthening,which hindered the climbing and sliding of dislocations,and restrained the formation of superdislocations in theγ'*** second creep stage was extended,and the minimum creep rate was ***,the increase of whole creep life of the alloy containing high Ta/Al ratio was attributed to the prolongation of the primary and second creep stages,and the low minimum creep *** appearance of the topological inversion phenomenon during the tertiary creep stage was the primary cause for the sudden increase of the creep strain rate of the alloy containing low Ta/Al ***,the high creep strain rate of the alloy containing high Ta/Al ratio during the tertiary creep stage was related to the occurrence and extending of the cracks near the *** alloys would lose efficacy within 20 h-30 h.

关键词： Ni-based superalloys Ta/Al ratio High temperature creep interfacial dislocation networks γ'rafting

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