Effect of the internal pressure of helium bubbles on the morphology and mobility of beryllium
Effect of the internal pressure of helium bubbles on the morphology and mobility of beryllium
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DOI：
10.1016/j.fusengdes.2023.113720
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发表时间：
2023-06
影响因子：
1.7
通讯作者：
Y. Sugimoto;Kazutomo Hara;M. Haruta;Hiroki Kurata;Jae-Hwan Kim;T. Hwang;M. Nakamichi;M. Miyamoto
中科院分区：
文献类型：
--
作者：
Y. Sugimoto;Kazutomo Hara;M. Haruta;Hiroki Kurata;Jae-Hwan Kim;T. Hwang;M. Nakamichi;M. Miyamoto
铍（Be）被选为ITER的面向等离子体材料和中子倍增器。Be暴露在燃烧的等离子体中，氦（He）气泡形成并生长。了解气泡行为至关重要，因为它会影响材料特性。利用原位透射电子显微镜（in situ TEM）和扫描透射电子显微镜结合电子能量损失谱（STEM-EELS）研究了Be中He气泡的内压和生长行为。利用STEM-EELS对氦泡的形状、厚度和内压进行了实验研究。球形He泡的内压高于刻面He泡的内压。原位TEM观察的气泡行为下退火在约973 K表明，球形氦气泡的生长速率高于那些刻面气泡。原位TEM观察表明，氦泡的布朗运动依赖于它们的形状。因此，球形He气泡与Be中的高压促进气泡的生长，由于他们的高流动性。
Beryllium (Be) has been selected as the plasma-facing material and a neutron multiplier in ITER. Be is exposed to burning plasma, and helium (He) bubbles are formed and grow. Understanding bubble behavior is crucial because it affects material properties. In this study, the internal pressure and growth behaviors of He bubbles in Be were investigated using in situ transmission electron microscopy (in situ TEM) and scanning transmission electron microscopy combined with electron energy loss spectroscopy (STEM-EELS). It was experimentally examined that the bubble shape, the bubble thickness, and the internal pressure of He bubbles using STEM-EELS. The internal pressure of the spherical He bubbles was higher than that of faceted He bubbles. In situ TEM observation of bubble behaviors under annealing at approximately 973 K showed that the growth rates of spherical He bubbles were higher than those of faceted bubbles. In situ TEM observations indicated that the Brownian motion of the He bubbles depended on their shape. Consequently, the spherical He bubbles with high pressure in Be facilitated bubble growth owing to their high mobility.