Comparison of erosion processes of RAF and pure Fe by hydrogen and carbon mixed ion beam irradiation

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Sputtering erosion and surface morphology of F82H and pure Fe irradiated by hydrogen and carbon mixed ion beam ( 1 keV H 3 + ) were studied. It was found that carbon impurity (0.7–0.8%) in hydrogen ion beam caused significant reduction in the sputtering yield for Fe at elevated temperatures (⩾773 K). On the other hand, the increase in the sputtering yield at elevated temperature was observed for F82H. Surface roughening at 423 K for Fe was pronounced in the case of C: 0.1%, but not in C: 0.7%. The mechanisms for these carbon effects could be related to surface disordering and change of grain orientation by mixed ion bombardment.