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Dislocation Structure in a Single Crystal Nickel Base Superalloy During High Cycle Fatigue at 870 degrees C
Shui Li1; Xu Yunchao1; Hu Zhuangqi2
Corresponding AuthorShui Li(shuilisy@163.com)
2018-04-01
Source PublicationRARE METAL MATERIALS AND ENGINEERING
ISSN1002-185X
Volume47Issue:4Pages:1054-1058
AbstractDislocation structure and its impact on the mechanical behavior of a gamma' strengthened nickel base single crystal alloy under high cycle fatigue (HCF) at 870 degrees C was studied. The results indicate that HCF lifetime declines with increase of applied stress amplitude. In the early stages, the fatigue deformation occurs by forced bowing of dislocations through the narrow gamma matrix channels on {111} planes. During mid-term fatigue stages, most of the dislocations formed in the matrix are located in the gamma/gamma' interfaces, whose intersection and reaction produce new dislocation segments and three-dimensional dislocation networks. The Burgers vectors of the dislocations in the network are 1/2<110>. The interaction of cyclic stress with high temperature induces the precipitation of homogeneous globular gamma' particles, which is beneficial to fatigue strength. At the end of fatigue test, the cyclic stress leads to the formation of persistent slip bands moving through the gamma matrix channels and gamma' particles. Dislocation shearing through the gamma'phase is found occasionally. The extrinsic stacking faults is also observed.
Keywordnickel base single crystal superalloy high cycle fatigue dislocation
Funding OrganizationNational Natural Science Foundation of China
Indexed BySCI
Language英语
Funding ProjectNational Natural Science Foundation of China[50171045]
WOS Research AreaMaterials Science ; Metallurgy & Metallurgical Engineering
WOS SubjectMaterials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
WOS IDWOS:000431601500006
PublisherNORTHWEST INST NONFERROUS METAL RESEARCH
Citation statistics
Cited Times:4[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/128040
Collection中国科学院金属研究所
Corresponding AuthorShui Li
Affiliation1.Shenyang Ligong Univ, Shenyang 110159, Liaoning, Peoples R China
2.Chinese Acad Sci, Inst Met Res, Shenyang 110016, Liaoning, Peoples R China
Recommended Citation
GB/T 7714
Shui Li,Xu Yunchao,Hu Zhuangqi. Dislocation Structure in a Single Crystal Nickel Base Superalloy During High Cycle Fatigue at 870 degrees C[J]. RARE METAL MATERIALS AND ENGINEERING,2018,47(4):1054-1058.
APA Shui Li,Xu Yunchao,&Hu Zhuangqi.(2018).Dislocation Structure in a Single Crystal Nickel Base Superalloy During High Cycle Fatigue at 870 degrees C.RARE METAL MATERIALS AND ENGINEERING,47(4),1054-1058.
MLA Shui Li,et al."Dislocation Structure in a Single Crystal Nickel Base Superalloy During High Cycle Fatigue at 870 degrees C".RARE METAL MATERIALS AND ENGINEERING 47.4(2018):1054-1058.
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