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

Be-7at%V合金とSS316LNとの両立性試験

土谷 邦彦; 滑川 要二; 石田 卓也; 江森 式康

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

ベリリウム金属間化合物を含んだベリリウム系合金(Be-Ti, Be-Vなど)は、高温かつ高い中性子照射下で化学的安定性を有しており、核融合原型炉の先進中性子増倍材として期待されている。そこで、Be-V合金とSUS316LNとの両立性試験を行い、その両立性及び反応素過程について調べた。Be-V合金としては、Be$$_{12}$$V相と$$alpha$$Be相が共存するBe-7at%Vを用いた。外観観察の結果、SUS316LNの表面に白い反応層が観察された。一方、X線回折の結果、SUS316LNの表面にはBe$$_{2}$$Feとベリリウムの化合物としてBeNiが観察され、反応温度及び反応時間の増大とともにこれらの相対強度が大きくなることがわかった。また、SUS316LN表面の反応相厚さは、Beの場合と比較して約1/5であり、Be-V合金がSUS316LNと良好な両立性を有することを明らかにした。

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 $$alpha$$Be and Be$$_{12}$$V 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 Be$$_{2}$$Fe 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.

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