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Molecular Dynamics Simulation of the Structure and Deformation Behavior of gamma/alpha(2) Interface in TiAl Alloys
Tu Aidong1,2; Teng Chunyu3; Wang Hao1; Xu Dongsheng1; Fu Yun3; Ren Zhanyong3; Yang Rui1
Corresponding AuthorWang Hao(haowang@imr.ac.cn)
2019-02-11
Source PublicationACTA METALLURGICA SINICA
ISSN0412-1961
Volume55Issue:2Pages:291-298
AbstractTiAl alloys with gamma-TiAl and alpha(2)-Ti3Al dual-phase lamellar structure possess not only excellent high temperature performance but also density only about half of traditional superalloys. Such lamellar structure largely determines the mechanical properties of TiAl alloys. However, there is still a lack of understanding on the atomic structure of lamella, as well as their influence on the mechanical behaviors. For this reason, molecular dynamics with an embedded-atom potential is employed to investigate the energies of both the coherent and semi-coherent gamma/alpha(2) interfaces. The interface coherency is found to depend on the thickness ratio of gamma lamellae to alpha(2) lamellae, and there exists a critical lamella thickness, below/above which the interface is coherent/semi-coherent. Tensile loading perpendicular to the lamella interface indicates that the yield strength of coherent interface is higher than that of semi-coherent interface and the crack nucleation behavior varies with the thickness ratio of gamma lamellae to alpha(2), lamellae. The plastic deformation occurs first in the gamma region, forming Shockley partial dislocations and then crosses the gamma/alpha(2), interface via slip transfer, activating stacking faults on the pyramidal plane in the alpha(2) region. In this process, the gamma/alpha(2) interface provides nucleation sites for subsequent dislocations and cracks.
KeywordTiAl interface plastic deformation mechanical behavior molecular dynamics
Funding OrganizationNational Key Research and Development Program of China ; National Natural Science Foundation of China ; Aeronautical Science Foundation of China ; Youth Innovation Promotion Association of Chinese Academy of Sciences ; Special Project on Information Technology of Chinese Academy of Sciences
DOI10.11900/0412.1961.2018.00182
Indexed BySCI
Language英语
Funding ProjectNational Key Research and Development Program of China[2016YFB0701304] ; National Natural Science Foundation of China[51671195] ; Aeronautical Science Foundation of China[20160292002] ; Youth Innovation Promotion Association of Chinese Academy of Sciences[2015151] ; Special Project on Information Technology of Chinese Academy of Sciences[XXH13506-304]
WOS Research AreaMetallurgy & Metallurgical Engineering
WOS SubjectMetallurgy & Metallurgical Engineering
WOS IDWOS:000455945800014
PublisherSCIENCE PRESS
Citation statistics
Cited Times:2[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/131192
Collection中国科学院金属研究所
Corresponding AuthorWang Hao
Affiliation1.Chinese Acad Sci, Inst Met Res, Shenyang 110016, Liaoning, Peoples R China
2.Univ Sci & Technol China, Sch Mat Sci & Engn, Shenyang 110016, Liaoning, Peoples R China
3.AVIC China Aeropolytechnol Estab, Lab Fundamental Res, Beijing 100028, Peoples R China
Recommended Citation
GB/T 7714
Tu Aidong,Teng Chunyu,Wang Hao,et al. Molecular Dynamics Simulation of the Structure and Deformation Behavior of gamma/alpha(2) Interface in TiAl Alloys[J]. ACTA METALLURGICA SINICA,2019,55(2):291-298.
APA Tu Aidong.,Teng Chunyu.,Wang Hao.,Xu Dongsheng.,Fu Yun.,...&Yang Rui.(2019).Molecular Dynamics Simulation of the Structure and Deformation Behavior of gamma/alpha(2) Interface in TiAl Alloys.ACTA METALLURGICA SINICA,55(2),291-298.
MLA Tu Aidong,et al."Molecular Dynamics Simulation of the Structure and Deformation Behavior of gamma/alpha(2) Interface in TiAl Alloys".ACTA METALLURGICA SINICA 55.2(2019):291-298.
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