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

doi:10.1016/j.jmst.2019.10.046

IMR OpenIR

	Seeded growth of Ti-46Al-8Nb polysynthetically twinned crystals with an ultra-high elongation
	Jin, Hao 1,2; Jia, Qing 1; Xian, Quangang 1; Liu, Ronghua 1; Cui, Yuyou 1; Xu, Dongsheng 1; Yang, Rui 1
通讯作者	Yang, Rui(ryang@imr.ac.cn)
	2020-10-01
发表期刊	JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
ISSN	1005-0302
卷号	54 页码:190-195
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.
关键词	TiAl alloys Polysynthetically twinned crystals Peritectic solidification Seeded growth Ductility
资助者	National Natural Science Foundation of China ; National Key Research and Development Program of China
DOI	10.1016/j.jmst.2019.10.046
收录类别	SCI
语种	英语
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
WOS类目	Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
WOS记录号	WOS:000545310500019
出版者	JOURNAL MATER SCI TECHNOL
引用统计	被引频次：14[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/139605
专题	中国科学院金属研究所
通讯作者	Yang, Rui
作者单位	1.Chinese Acad Sci, Inst Met Res, Shenyang 110016, Peoples R China 2.Univ Chinese Acad Sci, Beijing 100049, 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.