Thermal diffusivity of irradiated tungsten and tungsten-rhenium alloys
Thermal diffusivity of irradiated tungsten and tungsten-rhenium alloys
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DOI：
10.1016/j.jnucmat.2020.152594
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发表时间：
2021
影响因子：
3.1
通讯作者：
M. Akiyoshi;L. Garrison;J. Geringer;Hsin Wang;A. Hasegawa;S. Nogami;Y. Katoh
中科院分区：
文献类型：
--
作者：
M. Akiyoshi;L. Garrison;J. Geringer;Hsin Wang;A. Hasegawa;S. Nogami;Y. Katoh
日美PHENIX项目在高通量同位素反应堆（HFIR）的RB-19 J密封舱实验中辐照钨材料。使用钆（Gd）屏蔽来吸收热中子并减少钨中的铯和锇的产生。在532 - 662 °C，剂量为0.21-0.46 dpa，晶粒取向垂直或平行于圆盘表面的条件下，对纯钨和掺K的W-3%Re样品进行了辐照。在100 °C至500 °C下进行热扩散率测量。在退火至900 °C之后进行额外的测量。在另一项研究中，辐照纯钨试样与未辐照的W-1%Re试样相比显示出相似的热扩散率结果。对于那些与本研究显示出良好一致性的样品，计算出Re的嬗变量约为0.52%。在这项研究中，不同剂量的辐照试样呈现出几乎相同的热扩散率。高达800 °C的退火导致热扩散率没有恢复。这些结果表明，晶体缺陷的热扩散率的退化的贡献是相当有限的。此外，在高温下，辐照试样的热扩散率接近于未辐照试样的热扩散率。
The Japan-US PHENIX project irradiated tungsten materials in the RB-19J capsule experiment in the High Flux Isotope Reactor (HFIR). A gadolinium (Gd) shielding was used to absorb the thermal neutrons and reduce rhenium and osmium generation in tungsten. Pure tungsten and K-doped W-3% Re samples were irradiated at 532 – 662 °C to dose of 0.21-0.46 dpa, with the grain orientation perpendicular or parallel to the disk surface. Thermal diffusivity measurements were performed from 100 °C to 500 °C. Additional measurements followed after annealing up to 900 °C. Irradiated pure tungsten specimens showed similar thermal diffusivity results compared with an unirradiated W-1% Re specimen in another study. The transmutation amount of Re was calculated to be about 0.52% for those specimens that showed good agreement with this study. Specimens irradiated in this study to different doses presented almost the same thermal diffusivity. Annealing up to 800 °C resulted in no recovery of thermal diffusivity. These results show that the contribution of crystalline defects to degradation of thermal diffusivity is quite limited. In addition, the thermal diffusivity of the irradiated specimens was getting close to that of the unirradiated specimens at elevated temperature.