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Theoretical study of effects of grain boundaries on the radiation damage iron and tungsten

《深圳大学学报理工版》[ISSN:1000-2618/CN:44-1401/N]

Issue:
2017年No.5(441-550)
Page:
521-525
Research Field:
物理与应用物理
Publishing date:

Info

Title:
Theoretical study of effects of grain boundaries on the radiation damage iron and tungsten
Author(s):
Zhao Zhe1 2 Li Yonggang2 Zhang Chuanguo2 and Zeng Zhi2
1) School of Physics and Material Science, Anhui University, Hefei, 230601, Anhui Province, P.R.China2) Key Laboratory for Materials Physics, Institute of Solid State Physics, Chinese Academy of Sciences, Hefei 230031, Anhui Province, P.R.China
Keywords:
plasma physics nano-crystalline materials radiation damage steady state anti-irradiation ability molecular dynamics grain boundary
PACS:
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DOI:
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Abstract:
This study is based on thechemical rate theory at steady state and the grain boundary sink effect. We find that the anti-irradiation ability of nano-crystallinematerials is mainly determined by vacancy diffusivity but barely by the absorption bias (the ratio of vacancy diffusivity to interstitial diffusivity). The anti-irradiation abilities of Nano-crystalline iron andnano-crystalline tungsten are better than that of poly-crystalline. The behavior of radiation damage in nano-crystalline materials under non-equilibrium state is investigated by simulating the absorption capacity of grain boundaries on interstitials and vacancies by the molecular dynamics method. It is shown that the grain boundary has a good trapping ability for vacancies in iron. While for tungstenas a plasma facing material,more vacancies are retained in the bulk, mainly due to the effect of absorption bias. Under the typical service environment of fusion devices in the future, the level of absorption bias dominates the anti-irradiation ability of nano-crystalline materials before the steady state is reached.

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Last Update: 2017-09-11