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First-principles investigation of the impurity-kink interaction in bcc iron

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  • Condensed State Physics
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Chinese Science Bulletin

Abstract

Using the first-principles self-consistent discrete variational method based on density functional theory, we investigated the effect of light impurities C and N on the electronic structure of kink on the [100](010) edge dislocation (ED) in bcc iron. Our energetic calculations show that the light impurities have a strong segregation tendency to enter the kink. The results of the charge distribution and the local density of states indicate that the strong bonds between the impurity atoms and the neighboring Fe atoms are formed due to the hybridizations of impurity atoms 2p states and Fe 3d4s4p states. The introduction of light impurities can stabilize the kink system, and impedes the sideward motion of the kink in the [100](010) ED. This is, the light impurities induce a strong pinning effect on the [100](010) ED and may result in the solid solute hardening.

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Authors and Affiliations

  1. Central Iron and Steel Research Institute, Beijing, 100081, China

    Tao Yu, ChongYu Wang & JunPing Du

  2. College of Sciences, Central South University of Forestry and Technology, Changsha, 410004, China

    LiQun Chen & ZhengChen Qiu

  3. Department of Physics, Tsinghua University, Beijing, 10084, China

    ChongYu Wang

Authors
  1. Tao Yu
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  2. LiQun Chen
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  3. ChongYu Wang
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  4. ZhengChen Qiu
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  5. JunPing Du
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Correspondence to Tao Yu.

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Supported by National Basic Research Program of China (Grant No. 2006CB605102) and National Natural Science Foundation of China (Grant No. 90306016)

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Yu, T., Chen, L., Wang, C. et al. First-principles investigation of the impurity-kink interaction in bcc iron. Chin. Sci. Bull. 53, 1796–1803 (2008). https://doi.org/10.1007/s11434-008-0256-y

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  • DOI: https://doi.org/10.1007/s11434-008-0256-y

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