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In-situ TEM observation of the evolution of helium bubbles in Mo during He+ irradiation and post-irradiation annealingProject supported by the National Natural Science Foundation of China (Grant Nos. U1967211, U1832112, and 11975191).
Chinese Physics B ( IF 1.7 ) Pub Date : 2021-08-27 , DOI: 10.1088/1674-1056/abff48
Yi-Peng Li 1, 2 , Guang Ran 1, 2 , Xin-Yi Liu 1, 2 , Xi Qiu 3 , Qing Han 1, 2 , Wen-Jie Li 3 , Yi-Jia Guo 1, 2
Affiliation  

The evolution of helium bubbles in purity Mo was investigated by in-situ transmission electron microscopy (TEM) during 30 keV He+ irradiation (at 673 K and 1173 K) and post-irradiation annealing (after 30 keV He+ irradiation with the fluence of 5.74 1016 He+/cm2 at 673 K). Both He+ irradiation and subsequently annealing induced the initiation, aggregation, and growth of helium bubbles. Temperature had a significant effect on the initiation and evolution of helium bubbles. The higher the irradiation temperature was, the larger the bubble size at the same irradiation fluence would be. At 1173 K irradiation, helium bubbles nucleated and grew preferentially at grain boundaries and showed super large size, which would induce the formation of microcracks. At the same time, the geometry of helium bubbles changed from sphericity to polyhedron. The polyhedral bubbles preferred to grow in the shape bounded by {100} planes. After statistical analysis of the characteristic parameters of helium bubbles, the functions between the average size, number density of helium bubbles, swelling rate and irradiation damage were obtained. Meanwhile, an empirical formula for calculating the size of helium bubbles during the annealing was also provided.



中文翻译:

原位TEM观察He+辐照和辐照后退火过程中Mo中氦气泡的演变,国家自然科学基金项目(U1967211、U1832112和11975191)。

通过原位透射电子显微镜 (TEM) 在 30 keV He +照射(673 K 和 1173 K)和照射后退火(30 keV He +照射后5.74 10 16 He + /cm 2在 673 K)。他+辐照和随后的退火诱导了氦气泡的产生、聚集和生长。温度对氦气泡的产生和演化有显着影响。辐照温度越高,相同辐照通量下的气泡尺寸越大。在 1173 K 辐照下,氦气泡在晶界处成核并优先生长,并呈现出超大尺寸,这会导致微裂纹的形成。同时,氦气泡的几何形状从球形变为多面体。多面体气泡更喜欢以{100}面为界的形状生长。通过对氦气泡特征参数的统计分析,得到了氦气泡的平均尺寸、数量密度、膨胀速率与辐照损伤之间的函数关系。同时,

更新日期:2021-08-27
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