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Atomic-scale investigation on the interface structure of {2(2)over-bar01} alpha(2)-Ti3Al deformation twins in polysynthetically twinned TiAl single crystals
He, Neng1,2; Qi, Zhixiang3; Cheng, Yongxin1,2; Zhang, Jinpeng3; He, Lianlong1,2; Chen, Guang3
Corresponding AuthorHe, Lianlong(llhe@imr.ac.cn) ; Chen, Guang(gchen@njust.edu.cn)
2021
Source PublicationINTERMETALLICS
ISSN0966-9795
Volume128Pages:6
AbstractThe interface structure of {2 (2) over bar 01} alpha(2)-Ti3Al deformation twins formed during tensile deformation of poly synthetically twinned (PST) TiAl single crystals at 900 degrees C has been studied systematically by aberration-corrected scanning transmission electron microscopy. Numerous superlattice intrinsic stacking faults (SISFs) are formed on the (0001) basal plane of alpha(2) twins, thereby resulting in the formation of steps on the twin boundaries. The height of steps equals to the spacing of the (2 (2) over bar 01) twinning plane. The basal-plane SISFs formed in alpha(2) twins can't be attributed to the glide of Shockley superpartial dislocations. Lattice correspondence analyses based on classical twinning theory reveal that complex atomic shuffle and interchange shuffling are responsible for the formation of twinning and basal-plane SISFs in alpha(2) twins. In addition, basal-plane antiphase boundaries (APB) are formed at the vicinity of alpha(2) twin tips to relieve the stress concentration imposed by misfit dislocations.
KeywordPolysynthetically twinned TiAl single crystals alpha 2-Ti3Al twins Transmission electron microscope Superlattice intrinsic stacking fault Antiphase boundary Lattice correspondence
Funding OrganizationNational Natural Science Foundation of China ; National Key Laboratory for Precision Hot Processing of Metals, Harbin Institute of Technology ; Fundamental Research Funds for the Central Universities
DOI10.1016/j.intermet.2020.106995
Indexed BySCI
Language英语
Funding ProjectNational Natural Science Foundation of China[51731006] ; National Natural Science Foundation of China[51771093] ; National Natural Science Foundation of China[91860104] ; National Key Laboratory for Precision Hot Processing of Metals, Harbin Institute of Technology[6142909190104] ; Fundamental Research Funds for the Central Universities[30919011295]
WOS Research AreaChemistry ; Materials Science ; Metallurgy & Metallurgical Engineering
WOS SubjectChemistry, Physical ; Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
WOS IDWOS:000596368300002
PublisherELSEVIER SCI LTD
Citation statistics
Cited Times:5[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/158707
Collection中国科学院金属研究所
Corresponding AuthorHe, Lianlong; Chen, Guang
Affiliation1.Chinese Acad Sci, Shenyang Natl Lab Mat Sci, Inst Met Res, Shenyang 110016, Peoples R China
2.Univ Sci & Technol China, Sch Mat Sci & Engn, Shenyang 110016, Peoples R China
3.Nanjing Univ Sci & Technol, MIIT Key Lab Adv Metall & Intermetall Mat Technol, Engn Res Ctr Mat Behav & Design, Minist Educ, Nanjing 210094, Peoples R China
Recommended Citation
GB/T 7714
He, Neng,Qi, Zhixiang,Cheng, Yongxin,et al. Atomic-scale investigation on the interface structure of {2(2)over-bar01} alpha(2)-Ti3Al deformation twins in polysynthetically twinned TiAl single crystals[J]. INTERMETALLICS,2021,128:6.
APA He, Neng,Qi, Zhixiang,Cheng, Yongxin,Zhang, Jinpeng,He, Lianlong,&Chen, Guang.(2021).Atomic-scale investigation on the interface structure of {2(2)over-bar01} alpha(2)-Ti3Al deformation twins in polysynthetically twinned TiAl single crystals.INTERMETALLICS,128,6.
MLA He, Neng,et al."Atomic-scale investigation on the interface structure of {2(2)over-bar01} alpha(2)-Ti3Al deformation twins in polysynthetically twinned TiAl single crystals".INTERMETALLICS 128(2021):6.
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