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In-situ studies of TiAl polysynthetically twinned crystals: Critical fluctuations and microstructural evolution
Li, Xi; Bhattacharyya, Dhriti; Jin, Hao; Reid, Mark; Dippenaar, Rian; Yang, Rui; Liss, Klaus-Dieter
2020-01-30
Source PublicationJOURNAL OF ALLOYS AND COMPOUNDS
Volume815
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.
DOI10.1016/j.jallcom.2019.152454
WOS IDWOS:000502521900127
Citation statistics
Cited Times:1[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/83195
Collection中国科学院金属研究所
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.
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.
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).
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