Compatibility between Be12Ti and SS316LN

Beryllides have good properties and are one of the candidate materials for the neutron multiplier of the DEMO reactor in which good performance is required at 600–800 °C. Therefore, a good compatibility with structural materials is expected for the beryllides. In this study, a compatibility test between Be12Ti and SS316LN was carried out as first step to evaluate the compatibility between beryllides and structural materials. The thickness of the reaction layer between Be12Ti and SS316LN at 800 °C after 1000 h was approximately 30 μm, whereas that of beryllium metal was 300 μm. At 600 °C after 1000 h, the thickness of the reaction layers as to Be12Ti and Be was less than 10 and 100 μm, respectively. The compatibility between Be12Ti and SS316LN was evaluated and Be12Ti was perfectly better than that between beryllium metal and SS316LN at high temperature (600–800 °C). The advantage of beryllides as a neutron multiplier in the Demo reactor was proved.