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Newest developments in nuclear fission and fusion technology as well asplanned long-distance space missions demand novel materials to withstand harsh,irradiative environments. Radiation-induced hardening and embrittlement are aconcern that can lead to failure of materials deployed in these applications.Here the underlying mechanisms are accommodation and clustering of latticedefects created by the incident radiation particles. Interfaces, such as freesurfaces, phase and grain boundaries, are known for trapping and annihilatingdefects and therefore preventing these radiation-induced defects from formingclusters. In this work, differently structured nanocomposite materials based onCu-Fe-Ag were fabricated using a novel solid-state route, combining severeplastic deformation with thermal and electrochemical treatments. The influenceof different interface types and spacings on radiation effects in thesematerials was investigated using nanoindentation. Interface-rich bulknanocomposites showed a slight decrease in hardness after irradiation, whereasthe properties of a nanoporous material remain mostly unchanged. An explanationfor this different material behavior and its link to recovery mechanisms atinterfaces is attempted in this work, paving a concept towards radiationresistant materials.

Impact of interfaces on the radiation response and underlying defect recovery mechanisms in nanostructured Cu-Fe-Ag