Multistep evolution of beta(o) phase during isothermal annealing of Ti-42Al-5Mn alloy: Formation of Laves phase

doi:10.1016/j.intermet.2020.106932

CORC > 金属研究所 > 中国科学院金属研究所

	Multistep evolution of beta(o) phase during isothermal annealing of Ti-42Al-5Mn alloy: Formation of Laves phase
	Tang, Hongjian 2,3; Li, Xiaobing 1,3; Ma, Yingche 1,3; Chen, Bo 1,3; Xing, Weiwei 1,3; Zhao, Pengxiang 2,3; Shu, Lei 1,3; Zhang, Mengshu 1,3; Lui, Kui 1,3
刊名	INTERMETALLICS
	2020-11-01
卷号	126 页码:9
关键词	gamma-TiAl beta(o) phase Phase transformation Laves Diffusion Microstructural evolution
ISSN号	0966-9795
DOI	10.1016/j.intermet.2020.106932
通讯作者	Li, Xiaobing(xbli@imr.ac.cn) ; Lui, Kui(kliu@imr.ac.cn)
英文摘要	Intermetallic beta-solidifying gamma-TiAl alloys exhibit improved hot workability owing to the presence of soft beta phase at elevated temperature. However, through the incorporation of essential beta-stabilizers the metastable ordered beta phase (beta(o)) is retained and hence an understanding of its phase transformation behavior at target temperature is indispensable. Here we report new insights into the multistep evolution of the beta(o) phase during isothermal annealing of Ti-42Al-5Mn (at.%) alloy at 800 degrees C. Our observations reveal that both irregularly shaped alpha(2) and gamma platelets are firstly precipitated from the interior of beta(o) phase, accompanied with Mn rejection to the surrounding. And this contributes to the local enrichment of Mn, which thereupon leads to intragranular precipitation of secondary phase particles (SPPs). More specifically, an ellipsoidal submicrometre-scale Mn-rich Laves phase with a C14 hexagonal structure formed at the expense of alpha(2) precipitates via a shuffle of atoms is detected. The Laves phase has an orientation relationship (OR) with the parent alpha(2) phase described as [10 (1) over bar0]alpha(2)//[11 (2) over bar0](Laves), (0001)alpha(2)//(1 (1) over bar 00)(Laves). It is due to the instability of partial pre-formed gamma precipitates that assists the solution of Al in Laves phase forming the formula Ti(Al,Mn)(2), thereby facilitating the growth of Laves phase.
资助项目	National Natural Science Foundation of China[51971215] ; National Natural Science Foundation of Liaoning province of China[2019-MS-330] ; China postdoctoral science foundation[2019M661152]
WOS研究方向	Chemistry ; Materials Science ; Metallurgy & Metallurgical Engineering
语种	英语
出版者	ELSEVIER SCI LTD
WOS记录号	WOS:000579759400019
资助机构	National Natural Science Foundation of China ; National Natural Science Foundation of Liaoning province of China ; China postdoctoral science foundation
内容类型	期刊论文
源URL	[http://ir.imr.ac.cn/handle/321006/140925]
专题	金属研究所_中国科学院金属研究所
通讯作者	Li, Xiaobing; Lui, Kui
作者单位	1.IMR NMSA, CAS Key Lab Nucl Mat & Safety Assessment, Shenyang 110014, Peoples R China 2.Univ Sci & Technol China, Sch Mat Sci & Engn, Hefei 230026, Peoples R China 3.Chinese Acad Sci, Inst Met Res, Shenyang 110016, Peoples R China
推荐引用方式 GB/T 7714	Tang, Hongjian,Li, Xiaobing,Ma, Yingche,et al. Multistep evolution of beta(o) phase during isothermal annealing of Ti-42Al-5Mn alloy: Formation of Laves phase[J]. INTERMETALLICS,2020,126:9.
APA	Tang, Hongjian.,Li, Xiaobing.,Ma, Yingche.,Chen, Bo.,Xing, Weiwei.,...&Lui, Kui.(2020).Multistep evolution of beta(o) phase during isothermal annealing of Ti-42Al-5Mn alloy: Formation of Laves phase.INTERMETALLICS,126,9.
MLA	Tang, Hongjian,et al."Multistep evolution of beta(o) phase during isothermal annealing of Ti-42Al-5Mn alloy: Formation of Laves phase".INTERMETALLICS 126(2020):9.