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Seeded growth of Ti-46Al-8Nb polysynthetically twinned crystals with an ultra-high elongation
Jin, Hao1,2; Jia, Qing1; Xian, Quangang1; Liu, Ronghua1; Cui, Yuyou1; Xu, Dongsheng1; Yang, Rui1
Corresponding AuthorYang, Rui(ryang@imr.ac.cn)
2020-10-01
Source PublicationJOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
ISSN1005-0302
Volume54Pages:190-195
AbstractLarge size polysynthetically twinned crystals of Ti-46Al-8Nb alloy with a parallel lamellar microstructure were successfully prepared using a Ti-43Al-3Si seed by our new operation. A large amount of columnar B2 phase paralleling to the growth direction was found in the final lamellar microstructure. Higher growth rate (>30 mm/h) led to the failure of seeding process. Based on these results, a new mechanism is proposed to describe the seeding process of the hypo-peritectic TiAl alloys. The peritectic alpha. phase is suggested to directly nucleate from the melt, and then act as nucleus for transformed alpha. phase in the subsequent beta to alpha. transformation. At the higher growth rate, the appearance of beta phase secondary dendrites and homogeneous nucleation lead to the failure of seeding process. High Nb addition leads to a large amount of residual beta phase, and these beta dendrites finally evolve into B2 phase. The room temperature tensile elongation was measured to be 11.9-18.5% for Ti-46Al-8Nb PST crystals, which is the highest ever reported value for TiAl based alloys. (C) 2020 Published by Elsevier Ltd on behalf of The editorial office of Journal of Materials Science & Technology.
KeywordTiAl alloys Polysynthetically twinned crystals Peritectic solidification Seeded growth Ductility
Funding OrganizationNational Natural Science Foundation of China ; National Key Research and Development Program of China
DOI10.1016/j.jmst.2019.10.046
Indexed BySCI
Language英语
Funding ProjectNational Natural Science Foundation of China[51701209] ; National Key Research and Development Program of China[2016YEB0701304]
WOS Research AreaMaterials Science ; Metallurgy & Metallurgical Engineering
WOS SubjectMaterials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
WOS IDWOS:000545310500019
PublisherJOURNAL MATER SCI TECHNOL
Citation statistics
Cited Times:2[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/139603
Collection中国科学院金属研究所
Corresponding AuthorYang, Rui
Affiliation1.Chinese Acad Sci, Inst Met Res, Shenyang 110016, Peoples R China
2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
Recommended Citation
GB/T 7714
Jin, Hao,Jia, Qing,Xian, Quangang,et al. Seeded growth of Ti-46Al-8Nb polysynthetically twinned crystals with an ultra-high elongation[J]. JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY,2020,54:190-195.
APA Jin, Hao.,Jia, Qing.,Xian, Quangang.,Liu, Ronghua.,Cui, Yuyou.,...&Yang, Rui.(2020).Seeded growth of Ti-46Al-8Nb polysynthetically twinned crystals with an ultra-high elongation.JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY,54,190-195.
MLA Jin, Hao,et al."Seeded growth of Ti-46Al-8Nb polysynthetically twinned crystals with an ultra-high elongation".JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY 54(2020):190-195.
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