Twin boundary-assisted improvement of radiation resistance of iron: Defect evolution, mechanical properties, and deformation mechanism
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影响因子：3.555
DOI码：10.1016/j.jnucmat.2022.153818
所属单位：Hefei University of Technology
发表刊物：Journal of Nuclear Materials
关键字：Twin boundary Radiation damage Mechanical properties Deformation mechanism Dislocation evolution
摘要：Molecular dynamics (MD) simulations are applied to explore the defect evolution of single-crystal iron (SC Fe) and bicrystalline iron (BC Fe) under irradiation with 100 KeV energy at 673 K, and their mechan- ical properties and deformation mechanism under uniaxial tension at 300 K. The results show that twin boundary can significantly reduce the peak value of Frenkel defects, and enhance the defect clustering to inhibit the growth of clusters defects. The hardening behaviour is closely related to the fractions of recombinant point defects, while the unrecoverable point defects would transit to voids for the reduc- tion of strength. Twin boundary can capture some small voids and inhibit the coelescence and growth of voids for reduction of strength loss. Additionally, it can effectively enhance the irradiation brittleness resistance through the inhabition of loss of dislocation density after irradiation. The plastic deformations of the SC Fe models depend on the operation of atomic slip system with high dislocation density, while irradiation will lead to the transformation of plastic deformation mechanism into emission and motion of shear dislocation loops (SDLs) with lower dislocation density. The plastic deformation mechanisms of the Σ3 (11–2) BC Fe are phase transformation, and SDLs emission and motion, while those of the Σ11 (332) BC Fe are only SDLs emission and motion. Irradiation hardly affects the plastic deformation of BC Fe.
合写作者：Miao Meng,Kemin Xue
第一作者：Lusheng Wang
论文类型：期刊论文
通讯作者：Siliang Yan*,Ping Li
论文编号：153818
学科门类：工学
文献类型：J
卷号：567
期号：-
页面范围：1-14
是否译文：否
发表时间：2022-08-15
收录刊物：SCI、EI
发布期刊链接：https://www.sciencedirect.com/science/article/pii/S002231152200304X?via%3Dihub
附件：
Twin boundary-assisted improvement of radiation resistance of iron-Defect evolution.pdf