In-situ studies of TiAl polysynthetically twinned crystals: Critical fluctuations and microstructural evolution

doi:10.1016/j.jallcom.2019.152454

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	In-situ studies of TiAl polysynthetically twinned crystals: Critical fluctuations and microstructural evolution
	Li, Xi 2,3; Bhattacharyya, Dhriti 3,4; Jin, Hao 5; Reid, Mark 2,3; Dippenaar, Rian 2; Yang, Rui 5; Liss, Klaus-Dieter 1,2,3,6
刊名	JOURNAL OF ALLOYS AND COMPOUNDS
	2020-01-30
卷号	815 页码:8
关键词	Neutron diffraction Diffuse scattering High-temperature laser-scanning confocal microscopy Polysynthetically twinned crystals Short-range-order
ISSN号	0925-8388
DOI	10.1016/j.jallcom.2019.152454
通讯作者	Liss, Klaus-Dieter(kdl@gtiit.edu.cn)
英文摘要	Polysynthetically 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.
资助项目	China Scholarship Council[201406370145] ; University of Wollongong (UOW) ; Australian Nuclear Science and Technology Organisation (ANSTO)
WOS研究方向	Chemistry ; Materials Science ; Metallurgy & Metallurgical Engineering
语种	英语
出版者	ELSEVIER SCIENCE SA
WOS记录号	WOS:000502521900127
资助机构	China Scholarship Council ; University of Wollongong (UOW) ; Australian Nuclear Science and Technology Organisation (ANSTO)
内容类型	期刊论文
源URL	[http://ir.imr.ac.cn/handle/321006/136410]
专题	金属研究所_中国科学院金属研究所
通讯作者	Liss, Klaus-Dieter
作者单位	1.Guangdong Technion Israel Inst Technol, Shantou 515063, Peoples R China 2.Univ Wollongong, Sch Mech Mat Mechatron & Biomed Engn, Wollongong, NSW 2522, Australia 3.Australian Nucl Sci & Technol Org, Lucas Heights, NSW 2234, Australia 4.Univ New South Wales, Sydney, NSW 2052, Australia 5.Chinese Acad Sci, Inst Met Res, Shenyang 110016, Liaoning, Peoples R China 6.Technion Israel Inst Technol, IL-32000 Haifa, Israel
推荐引用方式 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.