Reduced activation ferritic/martensitic(RAFM)steels are candidates for first-wall and breeding-blanket structural materials in future fusion reactor systems.In the past,much work has been done on molecular dynamics(MD)simulation of displacement cascades,using pure Fe as model alloy for steels,described by a variety of interatomic potentials.However,the effect of magnetism on displacement cascades using MD in á-Fe has not been studied.