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分子动力学模拟氘泡在钨中的演化过程

发表时间:2016-01-15  浏览量:1793  下载量:623
全部作者: 刘升光,王艳芳,孙继忠,王德真
作者单位: 大连理工大学物理与光电工程学院
摘 要: 采用分子动力学方法研究在高通量的氘辐照下氘泡在钨中的演化过程。研究发现,在气泡周围的钨原子首先呈无序状分布;并且在钨表面出现了屋顶形状的凸起,同时晶界被清楚地观察到;随着气泡的生长,氘泡内的氘分子数目迅速增加,而且气泡弛豫时氘泡内的分子数目远大于连续轰击时氘泡内的分子数目;氘泡破裂时会有钨原子飞出,同时在钨表面形成了明显的钨裂纹,在进一步的轰击下,钨裂纹将是钨碎片的主要来源。
关 键 词: 等离子体物理学;气泡;分子动力学;钨;氢同位素
Title: Molecular dynamics simulations of the deuterium bubbles evolution in tungsten
Author: LIU Shengguang, WANG Yanfang, SUN Jizhong, WANG Dezhen
Organization: School of Physics and Optoelectronic Technology, Dalian University of Technology
Abstract: Molecular dynamics simulations are carried out to investigate the evolution of deuterium bubbles in tungsten exposed to the irradiation of high deuterium flux. It is found that tungsten bulk becomes disordered in bubble region. The simulation displays the development of a dome-shaped structure at the tungsten surface and the formation of grain boundaries. It is also found that the number of deuterium molecules increases as the bubble grows, and the number of molecules in bubbles under relaxation is much larger than the number in bubbles under cumulative bombardment. In company with the blister bursting, tungsten atoms are ejected into the free space and obvious crack forms subsequently. The crack may be potential sources of tungsten flakes if they are under further bombardment.
Key words: plasma physics; bubbles; molecular dynamics; tungsten; hydrogen isotope
发表期数: 2016年1月第1期
引用格式: 刘升光,王艳芳,孙继忠,等. 分子动力学模拟氘泡在钨中的演化过程[J]. 中国科技论文在线精品论文,2016,9(1):44-48.
 
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