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Volume 38 Issue 10
Oct.  2012
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Journal of Beijing University of Aeronautics and Astronautics  > 2012  >  38(10): 1380-1383.
Wang Wenbo, Zhou Chungen. Interdiffusion behavior in Nb/α-Ti3Al ternary system[J]. Journal of Beijing University of Aeronautics and Astronautics, 2012, 38(10): 1380-1383. (in Chinese)
Citation: Wang Wenbo, Zhou Chungen. Interdiffusion behavior in Nb/α-Ti3Al ternary system[J]. Journal of Beijing University of Aeronautics and Astronautics, 2012, 38(10): 1380-1383. (in Chinese)
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Interdiffusion behavior in Nb/α-Ti3Al ternary system

  • School of Materials Science and Engineering, Beijing University of Aeronautics and Astronautics, Beijing 100191, China

  • Received Date: 30 Sep 2011
  • Publish Date: 30 Oct 2012
    Abstract
  • The α2 single phase interdiffusion behavior in Ti3Al-Nb ternary system was studied at the temperature of 1 273 K, 1 423 K, 1 573 K, using Ti3Al/Nb single phase diffusion couples. The uniform β-(Ti, Nb) phase was formed in mid of the diffusion couple after 120 hours diffusion annealing in the high temperature. On the contrary, the nonuniform diffusion layers, including Ti3Al(Nb), β-(Ti,Nb) and Nb2Al, were formed in low temperature.The interdiffusion coefficients were calculated by the method of Dayananda, which can evaluate by the concentration dependence in one couple only. The calculation results show that the interdiffusion coefficients of Ti and Al is five order of magnitude larger than Nb, and Nb atoms are considered to occupy Ti sites in Ti3Al, the exchanges with vacancies on Ti sublattice played a leading role in the diffusion of Ti3Al. These results can provide a theoretical basis for the mechanisms of Nb improving the oxidation resistance of Ti3Al.

     

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