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

Sputtering erosion and surface morphology of F82H and pure Fe irradiated by hydrogen and carbon mixed ion beam (1keVH3+) 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.