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Theoretical progress in non-equilibrium grain-boundary segregation (II): Micro-mechanism of grain boundary anelastic relaxation and its analytical formula

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Abstract

Finding the internal-friction peak of grain boundary anelastic relaxation was one of the important breakthroughs in the study of internal friction in the last century. But the micro-mechanism of grain boundary anelastic relaxations is still obscure. Based on the observations of the grain boundary segregation or depletion of solute induced by an applied stress, the following micro-mechanism was suggested: grain-boundaries will work as sources to emit vacancies when a compressive stress is exerted on them and as sinks to absorb vacancies when a tensile stress is exerted, inducing grain-boundary depletion or segregation of solute, respectively. The equations of vacancy and solute concentrations at grain boundaries were established under the equilibrium of grain-boundary anelastic relaxation. With these the kinetic equations were established for grain boundary segregation and depletion during the grain boundary relaxation progress.

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Authors and Affiliations

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

    TingDong Xu & Kai Wang

  2. Department of Materials Science and Engineering, Shenzhen Graduate School, Harbin Institute of Technology, Shenzhen, 518055, China

    ShenHua Song

Authors
  1. TingDong Xu
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  2. Kai Wang
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  3. ShenHua Song
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Correspondence to TingDong Xu.

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Supported by the National Natural Science Foundation of China (Grant No. 50771036)

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Xu, T., Wang, K. & Song, S. Theoretical progress in non-equilibrium grain-boundary segregation (II): Micro-mechanism of grain boundary anelastic relaxation and its analytical formula. Sci. China Ser. E-Technol. Sci. 52, 1679–1687 (2009). https://doi.org/10.1007/s11431-009-0143-z

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  • DOI: https://doi.org/10.1007/s11431-009-0143-z

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