氦-氘相互作用对Fe9Cr合金辐照肿胀的影响

Effects of He-D Interaction on Irradiation-Induced Swelling in Fe9Cr Alloys.

作者信息

Wu Haibiao, Wang Zhen, Zhu Te, Xu Qiu, Wang Baoyi, Xiao Detao, Cao Xingzhong

机构信息

School of Nuclear Science and Technology, University of South China, Hengyang 421001, China.

The First Affiliated Hospital, Hengyang Medical School, University of South China, Hengyang 421001, China.

出版信息

Materials (Basel). 2021 Nov 5;14(21):6669. doi: 10.3390/ma14216669.

DOI:10.3390/ma14216669

PMID:34772196

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC8587859/

Abstract

The atomic-scale defects such as (deuterium, helium)-vacancy clusters in nuclear energy materials are one of the causes for the deterioration of the macroscopic properties of materials. Unfortunately, they cannot be observed by transmission electron microscopy (TEM) before they grow to the nanometer scale. Positron annihilation spectroscopy (PAS) has been proven to be sensitive to open-volume defects, and could characterize the evolution of the size and concentration of the vacancy-like nanoclusters. We have investigated the effects of He-D interaction on the formation of nanoscale cavities in Fe9Cr alloys by PAS and TEM. The results show that small-sized bubbles are formed in the specimen irradiated with 5 × 10 He/cm, and the subsequent implanted D-ions contribute to the growth of these helium bubbles. The most likely reason is that helium bubbles previously formed in the sample captured deuterium injected later, causing bubbles to grow. In the lower dose He-irradiated samples, a large number of small dislocations and vacancies are generated and form helium-vacancy clusters with the helium atoms.

摘要

核能材料中的原子尺度缺陷，如（氘、氦）-空位团簇，是材料宏观性能劣化的原因之一。不幸的是，在它们生长到纳米尺度之前，无法通过透射电子显微镜（TEM）观察到。正电子湮没光谱（PAS）已被证明对开放体积缺陷敏感，并且可以表征类空位纳米团簇的尺寸和浓度的演变。我们通过PAS和TEM研究了He-D相互作用对Fe9Cr合金中纳米尺度空洞形成的影响。结果表明，在5×10 He/cm辐照的试样中形成了小尺寸气泡，随后注入的D离子促进了这些氦气泡的生长。最可能的原因是先前在样品中形成的氦气泡捕获了后来注入的氘，导致气泡生长。在低剂量氦辐照的样品中，产生了大量小位错和空位，并与氦原子形成氦-空位团簇。