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Density functional theory calculations are conducted to investigate the stability and interactions among small helium (He) clusters in bulk tungsten (W).The lowest energy structure of each duster for sizes n =1 to 6 is determined.With the formation of He dusters,He defects form in bulk W.The thermodynamics of the clusters are investigated in the temperature range of 1000-2300K using molecular dynamics.This study provides the information essential to understand small He duster behavior in bulk W.