Seeded growth of Ti-46Al-8Nb polysynthetically twinned crystals with an ultra-high elongation

doi:10.1016/j.jmst.2019.10.046

CORC > 金属研究所 > 中国科学院金属研究所

	Seeded growth of Ti-46Al-8Nb polysynthetically twinned crystals with an ultra-high elongation
	Jin, Hao 1,2; Jia, Qing 2; Xian, Quangang 2; Liu, Ronghua 2; Cui, Yuyou 2; Xu, Dongsheng 2; Yang, Rui 2
刊名	JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
	2020-10-01
卷号	54 页码:190-195
关键词	TiAl alloys Polysynthetically twinned crystals Peritectic solidification Seeded growth Ductility
ISSN号	1005-0302
DOI	10.1016/j.jmst.2019.10.046
通讯作者	Yang, Rui(ryang@imr.ac.cn)
英文摘要	Large 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.
资助项目	National Natural Science Foundation of China[51701209] ; National Key Research and Development Program of China[2016YEB0701304]
WOS研究方向	Materials Science ; Metallurgy & Metallurgical Engineering
语种	英语
出版者	JOURNAL MATER SCI TECHNOL
WOS记录号	WOS:000545310500019
资助机构	National Natural Science Foundation of China ; National Key Research and Development Program of China
内容类型	期刊论文
源URL	[http://ir.imr.ac.cn/handle/321006/139604]
专题	金属研究所_中国科学院金属研究所
通讯作者	Yang, Rui
作者单位	1.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 2.Chinese Acad Sci, Inst Met Res, Shenyang 110016, Peoples R China
推荐引用方式 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.