A SURVEY OF THE PROPERTIES OF COPPER-ALLOYS FOR USE AS FUSION-REACTOR MATERIALS

Pure copper and some selected dilute alloys are widely utilised in experimental plasma confinement devices and have also been proposed for various applications in fusion power reactors where a high thermal or electrical conductivity in the material is required. Available data on physical and mechanical properties of a number of commercial coppers and alloys at elevated temperatures are collated and reviewed as an aid to materials selection and component design. Properties examined include the thermal and electrical conductivities. thermal fatigue resistance, softening behaviour, and creep and fatigue strengths. The effects of neutron irradiation on copper alloys are briefly discussed in terms of radiation damage and its influence on conductivity and mechanical properties, the compositional changes occurring through transmutation and the induced activity and associated gamma-dose rate and biological hazard potential. Data emerging from recent fission reactor irradiation programmes on void swelling and changes in electrical conductivity and mechanical properties are presented and discussed.