Displacement cascades were simulated by molecular dynamics methods in α-Fe containing different concentrations of substitutional He atoms. Primary knock-on atom energies, Ep, from 0.5 to 5keV were considered at the irradiation temperature of 100K. The concentration of He in Fe varies from 1 to 5at%, and the results were compared with the simulations performed in pure α-Fe. It was found that the total number of point defects increased with increasing He concentration. The present studies revealed the formation and configuration of He–vacancy clusters in the cascades of α-Fe. The production efficiency of He–vacancy clusters increased with increasing He concentration and primary knock-on atom energy.

Defect Production and Formation of Helium–Vacancy Clusters due to Cascades in α-Iron. L.Yang, X.T.Zu, H.Y.Xiao, F.Gao, H.L.Heinisch, R.J.Kurtz: Physica B, 2007, 391[1], 179-85