Compatibility tests between Be-7at%V alloy and SS316LN

Tsuchiya, Kunihiko ; Namekawa, Yoji; Ishida, Takuya; Emori, Noriyasu

Beryllium alloys such as Be-Ti and Be-V have been expected as promising candidates for advanced neutron multipliers of DEMO blankets from viewpoints of high melting point, high beryllium content, low radio activation, good chemical stability. In this study, the compatibility between Be-V and SUS316LN was investigated. The Be-7at%V specimens that includes Be and BeV phases were tested. After annealing of the Be-V in contact with SS316LN, white reaction zones were observed on the surface of SS316LN. From the XRD analysis, reaction products such as BeNi and BeFe were observed on the surface of SS316LN and intensity of these peaks increased with increasing annealing temperature and time. The thickness of reaction layer between Be-V and SS316LN was smaller than that between Be and SS316LN and the thickness was less than 1/5. Thus, it has been clarified that compatibility between Be-V and SS316LN is better than that between Be and SS316LN.