The role of boron in modifying the solidification and microstructure of nickel-base alloy U720Li

IMR OpenIR

	The role of boron in modifying the solidification and microstructure of nickel-base alloy U720Li
	Zhao, GD; Yu, LX; Yang, GL; Zhang, WH; Sun, WR; Sun, WR (reprint author), Chinese Acad Sci, Inst Met Res, Shenyang 110016, Peoples R China.
	2016-11-25
发表期刊	JOURNAL OF ALLOYS AND COMPOUNDS
ISSN	0925-8388
卷号	686 页码:194-203
摘要	This study is focused on the effect of boron addition, in the range of 0.011 wt% to 0.048 wt%, on the solidification behavior and microstructure of U720Li alloy. It has been found that boron increased the eutectic (gamma + gamma') precipitation significantly, while reduces the formation of eta phase and Zr-rich particles precipitated in front of the eutectic (gamma + gamma') obviously. Boron greatly retards the gamma matrix solidification which is verified by the fact that it markedly reduces the 'segregated area' around the final liquid pool or eutectic (gamma + gamma'). Based on this phenomenon, boron is assumed to form a layer at the solid/liquid interface and inhibits the attachment of atoms to attach on or jumping off the solid front, and hence lowers the gamma matrix solidification rate. Boron increases the eutectic (gamma + gamma') precipitation mainly by retarding the gamma matrix solidification, which resulting in deeper undercooling and more eutectic forming elements such as Ti left in the residual liquids. Subsequently, boron reduces the eta-Ni3Ti and Zr-rich phase formation because the increasing eutectic (gamma + gamma') precipitation favors the consumption of Ti and dissolving Zr in gamma' phase. (C) 2016 Published by Elsevier B.V.
部门归属	[zhao, guangdi ; yu, lianxu ; yang, guoliang ; zhang, weihong ; sun, wenru] chinese acad sci, inst met res, shenyang 110016, peoples r china ; [zhao, guangdi] univ sci & technol china, sch materials sci & engn, hefei 230026, peoples r china
关键词	U720li Boron Solidification Segregation Eutectic (Gamma Plus Gamma')
学科领域	Chemistry, Physical ; Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
收录类别	sci
语种	英语
WOS记录号	WOS:000382228300027
引用统计	被引频次：31[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/321006/76177
专题	中国科学院金属研究所
通讯作者	Sun, WR (reprint author), Chinese Acad Sci, Inst Met Res, Shenyang 110016, Peoples R China.
推荐引用方式 GB/T 7714	Zhao, GD,Yu, LX,Yang, GL,et al. The role of boron in modifying the solidification and microstructure of nickel-base alloy U720Li[J]. JOURNAL OF ALLOYS AND COMPOUNDS,2016,686:194-203.
APA	Zhao, GD,Yu, LX,Yang, GL,Zhang, WH,Sun, WR,&Sun, WR .(2016).The role of boron in modifying the solidification and microstructure of nickel-base alloy U720Li.JOURNAL OF ALLOYS AND COMPOUNDS,686,194-203.
MLA	Zhao, GD,et al."The role of boron in modifying the solidification and microstructure of nickel-base alloy U720Li".JOURNAL OF ALLOYS AND COMPOUNDS 686(2016):194-203.