期刊
JOURNAL OF NUCLEAR MATERIALS
卷 510, 期 -, 页码 61-69出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jnucmat.2018.07.057
关键词
Dislocation loop; Thin foil; Image forces; Elastic energy; Anisotropic elasticity; Irradiation; TEM; Fe
资金
- Swiss Generation IV Program
- EFDA
- National Natural Science Foundation of China [11702023]
- Swiss National Science Foundation [200021-172934/1]
Dislocation loops in irradiated ferritic steels have a Burgers vector of the type 1/2 a(0) < 111 > or a(0) < 100 >. When they are located in a thin foil such as the one used in transmission electron microscopy, the presence of the two free surfaces modify the elastic field by the action of the so-called 'image forces', which can in turn influence the loops. In this work, a general analytical method was deployed to calculate the image forces in an anisotropic bcc alpha-Fe thin foil containing a nanometric dislocation loop. We observe that image forces induce an out of plane displacement that doubles the bulging of the thin foil surfaces induced by the loop. The elastic field and energy induced by the image forces become remarkable when the depth of the dislocation loop is comparable to its size. Moreover, there is large difference in the response to image forces between the 1/2 a(0) < 111 > and the a(0) < 100 > loop, with a stronger one for the 1/2 a(0) < 111 > loop, which relates to the anisotropy of the alpha-Fe. (C) 2018 Elsevier B.V. All rights reserved.
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