Microstructural stability, phase evolution and mechanical properties of a forged W-modified high-Mn beta-gamma-TiAl alloy

doi:10.1016/j.intermet.2021.107230

IMR OpenIR

	Microstructural stability, phase evolution and mechanical properties of a forged W-modified high-Mn beta-gamma-TiAl alloy
	Li, Xiaobing 1,2,3; Tang, Hongjian 2,3; Xing, Weiwei 2,3; Zhao, Pengxiang 2,4; Chen, Bo 2,3; Ma, Yingche 2,3; Liu, Kui 2,3
通讯作者	Xing, Weiwei(wwxing@imr.ac.cn) ; Liu, Kui(kliu@imr.ac.cn)
	2021-09-01
发表期刊	INTERMETALLICS
ISSN	0966-9795
卷号	136 页码:9
摘要	The effects of W on the microstructure and tensile properties of two high Mn-containing beta - gamma TiAl alloys (nominal composition is Ti-42Al-5Mn and Ti-42Al-5Mn-0.8 W (at.%)) prepared by vacuum induction melting and conventional forging process were systematically investigated. The results showed that there were coarse columnar lamellar colonies in the as-cast W-free alloy, but in the W-added alloy, the microstructure was relatively uniform without the presence of coarse columnar lamellar colony. After forging, the two alloys were all nearly lamellar structure. With W addition, the lamellae size was reduced and the volume fraction of lamellar colonies was slightly decreased whereas the contents of beta o and gamma phases around the lamellar colony were increased. The partitioning behavior of W has also been investigated which was in the order of beta o>alpha 2>gamma in Ti-42Al-5Mn-0.8 W. The research results also proved that W addition had little effect on the distribution behavior of Ti and Al in gamma and alpha 2, whereas it has pronounced impact on that of Mn, Ti and Al in beta o. Under 800 degrees C ageing conditions, a large amount of granular Laves (Ti(Al,Mn)2) phase precipitated from beta o phase in the as-forged W-free alloy, which resulted in the brittle fracture at room temperature. On the contrary, the microstructure and tensile properties of the W-added alloy remain relatively stable with only a small amount of Laves phase observed, most of the beta o phase remained unchanged in the ageing samples. The Laves phase suppressed in W contained alloy are mainly due to the influences of W on the distribution of Mn in the beta o, and the diffusion and enrichment behavior of Mn during ageing.
关键词	TiAl-Mn based intermetallics Microstructure Ageing Laves phase Mechanical properties W
资助者	National Natural Science Foundation of China ; National Natural Science Foundation of China of Liaoning province ; China Postdoctoral Science Foundation
DOI	10.1016/j.intermet.2021.107230
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 China of Liaoning province[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:000696701700003
出版者	ELSEVIER SCI LTD
引用统计	被引频次：26[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/321006/166966
专题	中国科学院金属研究所
通讯作者	Xing, Weiwei; Liu, Kui
作者单位	1.Ji Hua Lab, Foshan 528200, Guangdong, Peoples R China 2.Chinese Acad Sci, Inst Met Res, Shi Changxu Innovat Ctr Adv Mat, Shenyang 110016, Peoples R China 3.IMR NMSA, CAS Key Lab Nucl Mat & Safety Assessment, Shenyang 110014, Peoples R China 4.Univ Sci & Technol China, Sch Mat Sci & Engn, Hefei 230026, Peoples R China
推荐引用方式 GB/T 7714	Li, Xiaobing,Tang, Hongjian,Xing, Weiwei,et al. Microstructural stability, phase evolution and mechanical properties of a forged W-modified high-Mn beta-gamma-TiAl alloy[J]. INTERMETALLICS,2021,136:9.
APA	Li, Xiaobing.,Tang, Hongjian.,Xing, Weiwei.,Zhao, Pengxiang.,Chen, Bo.,...&Liu, Kui.(2021).Microstructural stability, phase evolution and mechanical properties of a forged W-modified high-Mn beta-gamma-TiAl alloy.INTERMETALLICS,136,9.
MLA	Li, Xiaobing,et al."Microstructural stability, phase evolution and mechanical properties of a forged W-modified high-Mn beta-gamma-TiAl alloy".INTERMETALLICS 136(2021):9.