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In-situ studies of TiAl polysynthetically twinned crystals: Critical fluctuations and microstructural evolution
Li, Xi1,2; Bhattacharyya, Dhriti2,3; Jin, Hao4; Reid, Mark1,2; Dippenaar, Rian1; Yang, Rui4; Liss, Klaus-Dieter1,2,5,6
Corresponding AuthorLiss, Klaus-Dieter(kdl@gtiit.edu.cn)
2020-01-30
Source PublicationJOURNAL OF ALLOYS AND COMPOUNDS
ISSN0925-8388
Volume815Pages:8
AbstractPolysynthetically twinned (PST) crystals of TiAl alloys have attracted much attention due to its unique lamellar microstructure. Their microstructural evolution is essential for understanding the relationship between the microstructure and mechanical performance. Here, we report a comprehensive study of the microstructure and crystallography in Ti-47.5AI PST crystals via a combination of electron backscatter diffraction, in situ neutron diffraction and high-temperature laser-scanning confocal microscopy during heating cycles. It was found that Sigma 3 < 111 > twins of gamma-phase are unlikely to form along the lath direction. The observable gamma crystal orientation variants along the lath belong to the same twin family and are related to each other by a 120 degrees rotation along the < 111 > direction. Further diffraction studies show that a short-range-ordered structure persists in the disordered alpha-phase matrix at high temperature and recrystallizes to form a poly-crystalline structure of fully lamellar colonies after heat treatment. The microstructural evolution during heating and cooling is revealed by in situ high-temperature laser-scanning confocal microscopy, showing the detailed structural transformation and phase evolution from single grain PST crystals into a poly-crystalline structure. (C) 2019 Elsevier B.V. All rights reserved.
KeywordNeutron diffraction Diffuse scattering High-temperature laser-scanning confocal microscopy Polysynthetically twinned crystals Short-range-order
Funding OrganizationChina Scholarship Council ; University of Wollongong (UOW) ; Australian Nuclear Science and Technology Organisation (ANSTO)
DOI10.1016/j.jallcom.2019.152454
Indexed BySCI
Language英语
Funding ProjectChina Scholarship Council[201406370145] ; University of Wollongong (UOW) ; Australian Nuclear Science and Technology Organisation (ANSTO)
WOS Research AreaChemistry ; Materials Science ; Metallurgy & Metallurgical Engineering
WOS SubjectChemistry, Physical ; Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
WOS IDWOS:000502521900127
PublisherELSEVIER SCIENCE SA
Citation statistics
Cited Times:1[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/136411
Collection中国科学院金属研究所
Corresponding AuthorLiss, Klaus-Dieter
Affiliation1.Univ Wollongong, Sch Mech Mat Mechatron & Biomed Engn, Wollongong, NSW 2522, Australia
2.Australian Nucl Sci & Technol Org, Lucas Heights, NSW 2234, Australia
3.Univ New South Wales, Sydney, NSW 2052, Australia
4.Chinese Acad Sci, Inst Met Res, Shenyang 110016, Liaoning, Peoples R China
5.Guangdong Technion Israel Inst Technol, Shantou 515063, Peoples R China
6.Technion Israel Inst Technol, IL-32000 Haifa, Israel
Recommended Citation
GB/T 7714
Li, Xi,Bhattacharyya, Dhriti,Jin, Hao,et al. In-situ studies of TiAl polysynthetically twinned crystals: Critical fluctuations and microstructural evolution[J]. JOURNAL OF ALLOYS AND COMPOUNDS,2020,815:8.
APA Li, Xi.,Bhattacharyya, Dhriti.,Jin, Hao.,Reid, Mark.,Dippenaar, Rian.,...&Liss, Klaus-Dieter.(2020).In-situ studies of TiAl polysynthetically twinned crystals: Critical fluctuations and microstructural evolution.JOURNAL OF ALLOYS AND COMPOUNDS,815,8.
MLA Li, Xi,et al."In-situ studies of TiAl polysynthetically twinned crystals: Critical fluctuations and microstructural evolution".JOURNAL OF ALLOYS AND COMPOUNDS 815(2020):8.
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