Abstract
Property of interface materials used as boundary against sever environments seems to be gradually varied along to the distance from the surface. Material integrity might be influenced by the surface property degradation. Target vessel materials used in spallation neutron source will be exposed to proton and neutron irradiation and mercury immersion environments. In order to evaluate the surface degradation due to such environments, triple ions beam irradiation was carried out to the surface hardening treated materials that are candidate materials for a beam window in the target vessel. The mechanical property of the irradiated gradient surface layer was evaluated by the indentation technique with inverse analysis using multi-layer model. As a result, it was confirmed that the ductility loss of the surface-hardening-treated layer was hardly enhanced by irradiation, as compared with the changes of substrates.
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