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ExtreMat Neutron
Irradiation Experiments

O. Wouters, H. Hegeman, J. van der Laan

A large number of materials developed for use in extreme environments within the various subprojects of the ExtreMat Integrated Project are tested on their stability under neutron load in the High Flux Reactor in Petten, The Netherlands. To this aim, two irradiation capsules have been designed: one for a high neutron dose (equivalent neutron dose in stainless steel of 5 displacements per atom) in which specimens are irradiated at temperatures of 600°C and 900°C and one low dose capsule, designed to reach a neutron dose of 0.7 dpa at temperatures of 300°C and 550°C.
The low dose capsule has been dismantled and the post-irradiation results will be presented. They include measurements of physical properties such as thermal conductivity, thermal expansion and dynamic Young’s modulus and mechanical properties such as tensile and flexural strength. The materials that have been characterised include fiber reinforced metals, C and SiC based composites and graphites. Most materials have also been microstructurally examined after irradiation.
This paper addresses the results of the irradiation and gives a comparison of the pre- and post-irradiation properties for most of the materials loaded in the low dose capsule.

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