Sintering and irradiation of copper-based high entropy alloys for nuclear fusion
Sintering and irradiation of copper-based high entropy alloys for nuclear fusion
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DOI：
10.1016/j.fusengdes.2019.03.044
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发表时间：
2019-09-01
影响因子：
1.7
通讯作者：
Alves, E.
中科院分区：
文献类型：
--
作者：
Dias, M.;Antao, F.;Alves, E.
在这项研究中，CuxCrFeTiV（x = 0.21，0.44，1和1.7 M的比例）的高熵合金已被设计用于在核聚变反应堆的第一壁中的面向等离子体的钨瓦和铜基热沉之间的热屏障。通过球磨元素粉末，然后用放电等离子烧结固结来生产高熵合金。在室温下用Al（+）（300 keV）束以3 × 10（20）at/m（2）的通量对等原子CuCrFeTiV样品进行辐照。辐照前后的结构变化进行了研究，通过扫描电子显微镜，再加上能量色散X射线光谱，X射线衍射和热扩散系数。初步结果表明，在所有样品中存在异质和多相的显微结构。此外，随着Cu含量的增加，可以观察到富Cu结构的形成。CuCrFeTiV样品的衍射图显示BCC晶体结构的主峰和FCC晶体结构的次峰。此外，照射后没有修改的CuCrFeTiV的微观结构或衍射图中观察到。
In this study, CuxCrFeTiV (x = 0.21, 0.44, 1 and 1.7 M ratio) high entropy alloys have been devised for thermal barriers between the plasma facing tungsten tiles and the copper-based heat sink in the first wall of nuclear fusion reactors. The high entropy alloys were produced by ball milling the elemental powders, followed by consolidation with spark plasma sintering. Irradiation of the equiatomic CuCrFeTiV sample was carried out at room temperature with Ai(+) (300 keV) beams with a fluence of 3 x 10(20) at/m(2). Structural changes prior and after irradiation were investigated by scanning electron microscopy, coupled with energy dispersive X-ray spectroscopy, X-ray diffraction and thermal diffusivity. Preliminary results showed the presence of heterogenous and multiphasic microstructures in all samples. Moreover, with the increase of the Cu content it is possible to observe the formation of Cu-rich structures. The diffractogram of the CuCrFeTiV sample revealed major peaks of a BCC crystal structure and minor peaks of a FCC crystal structure. In addition, after irradiation no modifications in the CuCrFeTiV microstructure or in the diffractogram were observed.