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Non-equilibrium grain boundary co-segregation of Boron and Magnesium in Ni3Al

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Abstract

The non-equilibrium grain boundary co-segregation of boron and magnesium in Ni3Al–B–Mg alloys was determined by Auger electron spectroscopy (AES) in conjunction with ion sputtering in a cooling rate range of 0.05–269 K/s from temperatures of 1023, 1223 and 1373 K. The analytical expressions of diffusion rate equations describing non-equilibrium segregation process based on the concept that mobile solute-vacancy complexes migrating to grain boundaries is responsible for non-equilibrium grain boundary segregation of solute atoms in an alloy was used to simulate well the experimental results. The diffusion coefficients for boron atoms, boron-vacancy complexes, magnesium atoms and magnesium-vacancy complexes were determined, and the binding energy of boron-vacancy and magnesium-vacancy complexes was estimated.

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Authors and Affiliations

  1. School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai, 200030, People's Republic of China

    Dongliang Lin, Jing Hu & Yun Zhang

  2. Department of Mechanical and Engineering, Jiangsu Institute of Petrochemical Technology, Changzhou, 213016, People's Republic of China

    Jing Hu

Authors
  1. Dongliang Lin
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  2. Jing Hu
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  3. Yun Zhang
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Lin, D., Hu, J. & Zhang, Y. Non-equilibrium grain boundary co-segregation of Boron and Magnesium in Ni3Al. Journal of Materials Science 38, 261–267 (2003). https://doi.org/10.1023/A:1021101213074

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