强激光与粒子束2024，Vol.36Issue(1)：161-166,6.DOI:10.11884/HPLPB202436.230291
氦对钨传热性能影响的分子动力学研究
Molecular dynamics study of the effect of helium on the heat transfer performance of tungsten
摘要
Abstract
The effect of helium radiation on the heat transfer performance of tungsten was studied using molecular dynamics method.The changes of thermal conductivity of single crystal tungsten and polycrystalline tungsten with helium content as well as the microscopic mechanism were analyzed at the atomic scale.The results show that,as the number of helium atom increases from 0 to 500,the number of defect pairs in tungsten increases first and then decreases.When the number of helium atom in single crystal tungsten is 230,the defect pair reaches a peak of 123.In polycrystalline tungsten,the number of defect pairs reaches a peak of 124 at 480 helium atoms.The lattice structure of tungsten changes from bcc to coexistence of bcc,fcc and hcp.The thermal conductivity of tungsten fluctuates significantly with the increasing helium content,which shows a trend of nonlinear decrease in general.When the helium content is 0.75%,the thermal conductivities of single crystal tungsten and polycrystalline tungsten decrease by 1.44%and 1.3%,respectively.The creation and aggregation of point defects as well as the change of crystal structure induced by helium radiation are responsible for the decrease of thermal conductivity of tungsten.关键词
氦辐照/多晶钨/分子动力学模拟/传热性能Key words
helium irradiation/polycrystalline tungsten/molecular dynamics simulation/heat transfer performance分类
核科学引用本文复制引用
时永兴,张宝玲,闫鹏辉..氦对钨传热性能影响的分子动力学研究[J].强激光与粒子束,2024,36(1):161-166,6.基金项目
河南省科技攻关专项(232102320215) （232102320215）
河南省高等学校重点科研项目(20A490001) （20A490001）
