Abstract
Iron-based alloys are now being considered as plasma-facing materials for the first wall of future
fusion reactors. Therefore, the iron (Fe) and carbon (C) erosion will play a key role in predicting
the life-time and viability of reactors with steel walls. In this work, the surface erosion and
morphology changes due to deuterium (D) irradiation in pure Fe, Fe with 1% C impurity and the
cementite, are studied using molecular dynamics (MD) simulations, varying surface temperature
and impact energy. The sputtering yields for both Fe and C were found to increase with incoming
energy. In iron carbide, C sputtering was preferential to Fe and the deuterium was mainly trapped
as D2 in bubbles, while mostly atomic D was present in Fe and Fe-1%C. The sputtering yields
obtained from MD were compared to SDTrimSP yields. At lower impact energies, the sputtering
mechanism was of both physical and chemical origin, while at higher energies (>100 eV) the
physical sputtering dominated.
