Seed Preparation and Orientation Control of PST Crystals of Ti-47Al Alloy

doi:10.11900/0412.1961.2019.00138

CORC > 金属研究所 > 中国科学院金属研究所

	Seed Preparation and Orientation Control of PST Crystals of Ti-47Al Alloy
	Jin Hao 1,2; Jia Qing 1; Liu Ronghua 1; Xian Quangang 1; Cui Yuyou 1; Xu Dongsheng 1; Yang Rui 1
刊名	ACTA METALLURGICA SINICA
	2019-12-11
卷号	55 期号:12 页码:1519-1526
关键词	TiAl alloy polysynthetically twinned crystal seed technique directional solidification optical floating zone furnace
ISSN号	0412-1961
DOI	10.11900/0412.1961.2019.00138
通讯作者	Yang Rui(ryang@imr.ac.cn)
英文摘要	Button ingots were prepared by arc melting and feed bars for directional solidification were prepared by optimized drop casting technique. The Ti-43Al-3Si directionally solidified bars with lamellar boundaries perpendicular to the growth direction were prepared at the growth rate of 180 mm/h in an optical floating zone furnace. Cylindrical sections were cut from these perpendicular lamellae with appropriate direction and then fixed on polycrystalline TiAl bars by mechanical setting method to serve as the initial seeds. The ultimate Ti-43Al-3Si seeds with parallel lamellar microstructure were successfully prepared from these initial seeds at the growth rate of 5 mm/h. To avoid the nucleation of stray grains, drop-cast bars with the shape of frustum of a cone were used for the preparation of ultimate seeds. At the growth rates of 5 and 180 mm/h, the primary phase of Ti-43Al-3Si alloy was always the a phase. Polysynthetically twinned (PST) crystals of Ti-47Al alloy were obtained from the Ti-43Al-3Si ultimate seeds and the seeding process was studied by microscopic analysis. Lamellar microstructure of the seed kept stable and recrystallization of the seed was not found. Lamellar orientation of Ti-47Al PST crystals was successfully controlled by the ultimate Ti-43Al-3Si seed.
资助项目	National Natural Science Foundation of China[51701209]
WOS研究方向	Metallurgy & Metallurgical Engineering
语种	英语
出版者	SCIENCE PRESS
WOS记录号	WOS:000497774900005
资助机构	National Natural Science Foundation of China
内容类型	期刊论文
源URL	[http://ir.imr.ac.cn/handle/321006/136049]
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.Chinese Acad Sci, Inst Met Res, Shenyang 110016, Liaoning, 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,Liu Ronghua,et al. Seed Preparation and Orientation Control of PST Crystals of Ti-47Al Alloy[J]. ACTA METALLURGICA SINICA,2019,55(12):1519-1526.
APA	Jin Hao.,Jia Qing.,Liu Ronghua.,Xian Quangang.,Cui Yuyou.,...&Yang Rui.(2019).Seed Preparation and Orientation Control of PST Crystals of Ti-47Al Alloy.ACTA METALLURGICA SINICA,55(12),1519-1526.
MLA	Jin Hao,et al."Seed Preparation and Orientation Control of PST Crystals of Ti-47Al Alloy".ACTA METALLURGICA SINICA 55.12(2019):1519-1526.