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温度及深度对钛中氦泡释放过程影响的分子动力学研究

梁力 谈效华 向伟 王远 程焰林 马明旺

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温度及深度对钛中氦泡释放过程影响的分子动力学研究

梁力, 谈效华, 向伟, 王远, 程焰林, 马明旺

A molecular dynamics study of temperature and depth effect on helium bubble released from Ti surface

Liang Li, Tan Xiao-Hua, Xiang Wei, Wang Yuan, Cheng Yan-Lin, Ma Ming-Wang
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  • 利用分子动力学模拟方法对温度及He泡深度给金属Ti内He泡的体积、压强和释放过程等带来的影响进行了研究. 首先, 通过研究室温下He泡在金属Ti内不同深度处的状态, 得到He泡的形状、压强、体积等物理量随其深度的变化规律. 发现He泡压强随其深度增加逐渐变大, 体积则逐渐减小, 但当He泡深度增大到2.6 nm时, 二者均维持在某个固定值附近. 然后对包含有He泡的Ti体系在温度作用下的演化过程进行了模拟, 发现不同深度处He泡从金属Ti内释放出来所需要的临界温度有很大差别, 总体来看He泡越深, 释放所需的临界温度越高. 但不同温度下He原子的释放速率没有明显差别, 释放过程几乎均为瞬间完成. 最后通过对He泡内部压强和其上方金属Ti薄层的抗张强度进行统计对比, 阐述了金属Ti 体内He泡的释放机制: 当He泡内部压强大于其上方Ti薄层抗张强度时, He泡就会将Ti 薄层撕裂, 从而使He原子得到释放.
    Using molecular dynamics simulation, the effects of temperature and depth of helium bubble on volume, pressure and releasing process of helium bubble in metal Ti are investigated. First, through studying the states of helium bubble at different depths at room temperature, the variation regularities of volume, pressure and releasing process of helium bubble with its depth are acquired. The results show that with depth augmenting, the pressure of helium bubble increases gradually, while the volume decreases, but these two parameters are kept at some level when the depth is greater than 2.6 nm. Then, the evolutions of model system with helium bubble at various temperatures are simulated. The critical temperatures of helium bubble released from Ti surface at different depths are greatly different. On the whole, the critical temperature is in direct proportion to depth. But the releasing rates at different temperatures are almost unanimous. Finally, the mechanism of helium bubble released from Ti surface is explained on the basis of statistics and analyses of pressure of helium bubble and tensile strength of the metal thin film above the bubble. It is found that helium bubble would tear the Ti film above it when the pressure in helium bubble is greater than the strength of Ti film, and then helium atoms will be released from the metal.
    • 基金项目: 国家自然科学基金(批准号: 51406187)、中国工程物理研究院科学技术发展基金(批准号: 2014B0401060)和中国工程物理研究院电子工程研究所科技创新基金(批准号: S20140805)资助的课题.
    • Funds: Project supported by the National Natural Science Foundation of China (Grant No. 51406187), the Science and Technology Development Foundation of China Academy of Engineering Physics (Grant No. 2014B0401060), and the Technology Innovation Foundation of Institute of Electronic Engineering, China Academy of Engineering Physics (Grant No. S20140805).
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    Li Y, Deng A H, Zhou Y L, Zhou B, Wang K, Hou Q, Shi L Q, Qin X B, Wang B Y 2012 Chin. Phys. Lett. 29 047801

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    Liu W, Wu Q Q, Chen S L, Zhu J J, An Z, Wang Y 2012 Acta Phys. Sin. 61 176802 (in Chinese) [刘望, 邬琦琦, 陈顺礼, 朱敬军, 安竹, 汪渊 2012 物理学报 61 176802]

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    Wang L, Hu W Y, Xiao S F, Yang J Y, Deng H Q 2011 J. Mater. Res. 26 416

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    Zhang B L, Wang J, Li M, Hou Q 2013 J. Nucl. Mater. 438 178

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    Jorgensen W L, Chandrasekhar J, Madura J D, Impey R W, Klein M L 1983 J. Chem. Phys. 79 926

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  • [1]

    Rajainmaki H, Linderoth S, Hansen H E, Nieminen R M, Bentzon M D 1988 Phys. Rev. B 38 1087

    [2]

    Singh A, Maji S, Nambissan P M G 2001 J. Phys.: Condens. Matter 13 177

    [3]

    Trinkaus H, Singh B N 2003 J. Nucl. Mater. 323 229

    [4]

    Iwakiri H, Yasunaga K, Morishita K, Yoshida N 2000 J. Nucl. Mater. 283-287 1134

    [5]

    Ehrlich K, Bloom E E, Kondo T 2000 J. Nucl. Mater. 283-287 79

    [6]

    Kawano S, Sumiya R, Fukuya K 1998 J. Nucl. Mater. 258-263 2008

    [7]

    Wang P X, Song J S 2002 Helium in Materials and the Permeation of Tritium (Beijing: National Defense Industry Press) pp1, 2 (in Chinese) [王佩璇, 宋家树 2002 材料中氦及氚渗透(北京: 国防工业出版社)第1, 2 页]

    [8]

    Li N, Fu E G, Wang H, Carter J J, Shao L, Maloy S A, Misra A, Zhang X 2009 J. Nucl. Mater. 389 233

    [9]

    Lindau R, Moslang A, Preininger D, Rieth M, Rohrigb H D 1999 J. Nucl. Mater. 271-272 450

    [10]

    Birtcher R C, Donnelly S E, Templier C 1994 Phys. Rev. B 50 764

    [11]

    Galindo R E, Veen A V, Evans J H, Schut H, Hosson J T M D 2004 Nucl. Instrum. Meth. Phys. Res. B 217 262

    [12]

    Cipiti B B, Kulcinski G L 2005 J. Nucl. Mater. 347 298

    [13]

    Li Y, Deng A H, Zhou Y L, Zhou B, Wang K, Hou Q, Shi L Q, Qin X B, Wang B Y 2012 Chin. Phys. Lett. 29 047801

    [14]

    Liu W, Wu Q Q, Chen S L, Zhu J J, An Z, Wang Y 2012 Acta Phys. Sin. 61 176802 (in Chinese) [刘望, 邬琦琦, 陈顺礼, 朱敬军, 安竹, 汪渊 2012 物理学报 61 176802]

    [15]

    Wang L, Hu W Y, Xiao S F, Yang J Y, Deng H Q 2011 J. Mater. Res. 26 416

    [16]

    Zhang B L, Wang J, Li M, Hou Q 2013 J. Nucl. Mater. 438 178

    [17]

    Zhang B L, Wang J, Hou Q 2011 Chin. Phys. B 20 036105

    [18]

    Wang J, Zhang B L, Zhou Y L, Hou Q 2011 Acta Phys. Sin. 60 106601 (in Chinese) [汪俊, 张宝玲, 周宇璐, 侯氢 2011 物理学报 60 106601]

    [19]

    San-Martin A, Manchester F D 1987 Bull. Alloy Phase Diagr. 8 30

    [20]

    Daw M S, Baskes M I 1984 Phys. Rev. B 29 6443

    [21]

    Wang J, Hou Q, Wu Z C, Long X G, Wu X C, Luo S Z 2006 Chin. Phys. Lett. 23 1666

    [22]

    Jorgensen W L, Chandrasekhar J, Madura J D, Impey R W, Klein M L 1983 J. Chem. Phys. 79 926

    [23]

    Snow C S, Brewer L N, Gelles D S, Rodriguez M A 2008 J. Nucl. Mater. 374 147

    [24]

    Allenand M P, Tildesley D J 1987 Computer Simulation of Liquids (Oxford: Clarendon) pp56-60

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出版历程
  • 收稿日期:  2014-06-24
  • 修回日期:  2014-09-22
  • 刊出日期:  2015-02-05

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