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Microstructural Instability and Precipitation Behaviors of Intermetallic Phases in a Nb-Containing CoNi-Based Superalloy
Fan, Zhongding1; Wang, Xinguang2; Yang, Yanhong2; Chen, Hao1; Yang, Zhigang1; Zhang, Chi1
Corresponding AuthorZhang, Chi(chizhang@tsinghua.edu.cn)
2020-05-01
Source PublicationMETALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE
ISSN1073-5623
Volume51Issue:5Pages:2495-2508
AbstractExploring the alloying effect of various elements plays a crucial role in optimizing the alloy design for superalloys. In this study, the influence of Nb additions on a gamma '-strengthening CoNi-based superalloy has been investigated. Undesirable intermetallic phases including the topologically close-packed D8(5) phase and the ordered D0(19) phase were observed to preferentially form in the dendritic and interdendritic regions of the investigated alloy, respectively. Precipitation behaviors of the D0(19) phase and the D8(5) phase including growth mechanisms and crystallographic orientation relationships have been characterized and analyzed in detail using advanced electron microscopy techniques. First-principle calculations using density function theory have been carried out to evaluate the effect of Nb additions on the thermodynamic stability of the L1(2)-gamma ' phase. It turns out that the supercell with L1(2) structure would be energetically destabilized when the Nb-substituted atom sits on the Co or Al sites, which could correspond to the microstructural instability of the Nb-containing CoNi-based superalloy.
DOI10.1007/s11661-020-05710-7
Indexed BySCI
Language英语
WOS Research AreaMaterials Science ; Metallurgy & Metallurgical Engineering
WOS SubjectMaterials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
WOS IDWOS:000523180700044
PublisherSPRINGER
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Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/138089
Collection中国科学院金属研究所
Corresponding AuthorZhang, Chi
Affiliation1.Tsinghua Univ, Sch Mat Sci & Engn, Key Lab Adv Mat, Minist Educ, Beijing 100084, Peoples R China
2.Chinese Acad Sci, Inst Met Res, Superalloys Div, Shenyang 110016, Peoples R China
Recommended Citation
GB/T 7714
Fan, Zhongding,Wang, Xinguang,Yang, Yanhong,et al. Microstructural Instability and Precipitation Behaviors of Intermetallic Phases in a Nb-Containing CoNi-Based Superalloy[J]. METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE,2020,51(5):2495-2508.
APA Fan, Zhongding,Wang, Xinguang,Yang, Yanhong,Chen, Hao,Yang, Zhigang,&Zhang, Chi.(2020).Microstructural Instability and Precipitation Behaviors of Intermetallic Phases in a Nb-Containing CoNi-Based Superalloy.METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE,51(5),2495-2508.
MLA Fan, Zhongding,et al."Microstructural Instability and Precipitation Behaviors of Intermetallic Phases in a Nb-Containing CoNi-Based Superalloy".METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE 51.5(2020):2495-2508.
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