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

IMR OpenIR

	Multistep evolution of beta(o) phase during isothermal annealing of Ti-42Al-5Mn alloy: Formation of Laves phase
	Tang, Hongjian 1,2; Li, Xiaobing 1,3; Ma, Yingche 1,3; Chen, Bo 1,3; Xing, Weiwei 1,3; Zhao, Pengxiang 1,2; Shu, Lei 1,3; Zhang, Mengshu 1,3; Lui, Kui 1,3
通讯作者	Li, Xiaobing(xbli@imr.ac.cn) ; Lui, Kui(kliu@imr.ac.cn)
	2020-11-01
发表期刊	INTERMETALLICS
ISSN	0966-9795
卷号	126 页码:9
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.
关键词	gamma-TiAl beta(o) phase Phase transformation Laves Diffusion Microstructural evolution
资助者	National Natural Science Foundation of China ; National Natural Science Foundation of Liaoning province of China ; China postdoctoral science foundation
DOI	10.1016/j.intermet.2020.106932
收录类别	SCI
语种	英语
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
WOS类目	Chemistry, Physical ; Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
WOS记录号	WOS:000579759400019
出版者	ELSEVIER SCI LTD
引用统计	被引频次：21[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/321006/140926
专题	中国科学院金属研究所
通讯作者	Li, Xiaobing; Lui, Kui
作者单位	1.Chinese Acad Sci, Inst Met Res, Shenyang 110016, Peoples R China 2.Univ Sci & Technol China, Sch Mat Sci & Engn, Hefei 230026, Peoples R China 3.IMR NMSA, CAS Key Lab Nucl Mat & Safety Assessment, Shenyang 110014, 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.