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Evolution of local atomic structure during solidification of U116Nb12 liquid: An ab initio molecular dynamics study

文献类型：期刊论文

作者Shi, Yongpeng1,2; Liu, Mingfeng1,2; Chen, Yun1; Wang, Xin3; Mo, Wenlin3; Li, Dianzhong1; Fa, Tao3; Bai, Bin3; Wang, Xiaolin3; Chen, Xing-Qiu1
刊名JOURNAL OF ALLOYS AND COMPOUNDS
出版日期2019-05-30
卷号787页码:267-275
关键词U116Nb12 alloy Structural evolution Solidification Ab initio molecular dynamics
ISSN号0925-8388
DOI10.1016/j.jallcom.2019.02.013
通讯作者Chen, Xing-Qiu(xingqiu.chen@imr.ac.cn)
英文摘要By means of ab initio molecular dynamics (AIMD), the evolution of local atomic structures of the U116Nb12 liquid alloy during solidification from 2600 K to 600 K was systemically investigated in terms of the pair correlation function, structure factor, bond angle distribution, coordination number, the Honeycutt-Anderson (HA) and Voronoi index as well as diffusivity and viscosity. The distinctly linear dependence of the mean square displacements (MSDs) as a function of time indicates that the equilibrium configurations are derived from our AIMD simulations. The equations of the volumetric expansion, thermal diffusion and viscosity of the U116Nb12 liquid alloy are presented, respectively. The most abundant structures in the U116Nb12 liquid alloy are those having HA indices of 1551, 1541, 1431, 1441 and 1661. The Voronoi analysis reveals that the distributions of local atomic structures at high temperature are homogeneous, whereas Voronoi polyhedra trend to form <0,2,8,2>, <0,0,12,0>, <0,1,10,2>, <0,1,10,3>, <0,2,8,4>, <0,3,6,5> and <0,3,8,3> with the larger fraction at low temperature. The analysis of chemical short-range order and structural properties suggests that the icosahedra and bcc-type clusters play the dominant roles upon cooling and, the addition of Nb in the U116Nb12 liquid alloy is indeed beneficial to occurrence of the local atomic structural evolution. (C) 2019 Published by Elsevier B.V.
资助项目Science Challenging Project[TZ2016004] ; National Natural Science Foundation of China[51474202] ; National Natural Science Foundation of China[51701193]
WOS研究方向Chemistry ; Materials Science ; Metallurgy & Metallurgical Engineering
语种英语
WOS记录号WOS:000462592500031
出版者ELSEVIER SCIENCE SA
资助机构Science Challenging Project ; National Natural Science Foundation of China
源URL[http://ir.imr.ac.cn/handle/321006/132458]  
专题金属研究所_中国科学院金属研究所
通讯作者Chen, Xing-Qiu
作者单位1.Chinese Acad Sci, Shenyang Natl Lab Mat Sci, Inst Met Res, Shenyang 110016, Liaoning, Peoples R China
2.Univ Sci & Technol China, Sch Mat Sci & Engn, Shenyang 110016, Liaoning, Peoples R China
3.China Acad Engn Phys, Inst Mat, Jiangyou 621907, Sichuan, Peoples R China
推荐引用方式
GB/T 7714		 Shi, Yongpeng,Liu, Mingfeng,Chen, Yun,et al. Evolution of local atomic structure during solidification of U116Nb12 liquid: An ab initio molecular dynamics study[J]. JOURNAL OF ALLOYS AND COMPOUNDS,2019,787:267-275.
APA Shi, Yongpeng.,Liu, Mingfeng.,Chen, Yun.,Wang, Xin.,Mo, Wenlin.,...&Chen, Xing-Qiu.(2019).Evolution of local atomic structure during solidification of U116Nb12 liquid: An ab initio molecular dynamics study.JOURNAL OF ALLOYS AND COMPOUNDS,787,267-275.
MLA Shi, Yongpeng,et al."Evolution of local atomic structure during solidification of U116Nb12 liquid: An ab initio molecular dynamics study".JOURNAL OF ALLOYS AND COMPOUNDS 787(2019):267-275.

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来源：金属研究所

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