Shortminus;range order in Auminus;Fe radiationminus;enhanced diffusion and the effectiveness of 14minus;MeV neutrons

摘要

Solute clustering in a Auminus;Fe (17percnt; Fe) alloy has been demonstrated by Mouml;ssbauer effect measurements of the magnetic ordering temperature. Neutron irradiation at room temperature produces clustering by means of radiationminus;enhanced diffusion, while annealing at high temperatures is required to produce clustering thermally. The radiationminus;enhanced diffusion effect was used to compare directly the efficiency of mobile defect production by 14minus;MeV fusion neutrons and reactor neutrons. The 14minus;MeV neutrons are more effective by about a factor of 10 than the reactor neutrons (Egsim;0.1 MeV) in producing mobile lattice defects. Other compositions failed to respond to radiationminus;induced clustering, suggesting that Auminus;17minus;Fe is in a critical composition region regarding the response of the magnetic ordering temperature to variations in shortminus;range order.