Trapping and diffusion behaviors of helium at vacancy in iron from first principles  

作　　者：LIU YueLin SHI WenPu 

机构地区：[1]Department of Physics,Yantai University [2]School of Electromechanical Automobile Engineering,Yantai University

出　　处：《Science China(Physics,Mechanics & Astronomy)》2013年第6期1100-1106,共7页中国科学：物理学、力学、天文学（英文版）

基　　金：supported by the National Natural Science Foundation of China (Grant No. 51101135);the Natural Science Foundation of Shandong (Grant No. ZR2010AM002)

摘　　要：We investigate the structure,trapping,and diffusion behaviors of helium(He) at vacancy in a Fe single crystal using first-principles simulations.Vacancy with more space can provide the lower electron density region for He binding in comparison with intrinsic Fe,causing He to diffuse into the vacancy inner easily.We provide the quantitative microscopic studies related to the atomic-level thermo-kinetic trapping processes.Moreover,such physical viewpoint can be applied to other vacancy-like defects such as vacancy clusters,void and grain boundaries which can open a space with reduced electron density region to increase He binding in metals and metal alloys.We investigate the structure,trapping,and diffusion behaviors of helium（He） at vacancy in a Fe single crystal using first-principles simulations.Vacancy with more space can provide the lower electron density region for He binding in comparison with intrinsic Fe,causing He to diffuse into the vacancy inner easily.We provide the quantitative microscopic studies related to the atomic-level thermo-kinetic trapping processes.Moreover,such physical viewpoint can be applied to other vacancy-like defects such as vacancy clusters,void and grain boundaries which can open a space with reduced electron density region to increase He binding in metals and metal alloys.

关 键 词：IRON HELIUM DIFFUSION FIRST-PRINCIPLES 

分 类 号：O469[理学—凝聚态物理]