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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
Source PublicationJOURNAL OF ALLOYS AND COMPOUNDS
ISSN0925-8388
Volume686Pages:194-203
AbstractThis 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.
description.department[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
KeywordU720li Boron Solidification Segregation Eutectic (Gamma Plus Gamma')
Subject AreaChemistry, Physical ; Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
Indexed Bysci
Language英语
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/76177
Collection中国科学院金属研究所
Corresponding AuthorSun, WR (reprint author), Chinese Acad Sci, Inst Met Res, Shenyang 110016, Peoples R China.
Recommended Citation
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.
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