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Interface reactions and reaction synthesis of a high temperature composite system

  • J. S. Park
  • J. Cho
  • B. Y. Hur
  • J. H. Perepezko
Article

Abstract

Reactive diffusion during isothermal annealing was examined in a Ti−Al−Si temary system. When a TiAl/TiSi2 reaction couple was annealed at 1373 K for 200 h, the product phase sequence was observed as TiAl/TiAl2/Ti2Al5/TiAl3/Ti5Si4/TiSi/TiSi2, in which the integrated diffusion coefficient of Ti2Al5 showed the lowest value. A Ti-rich Ti5Si3 phase appeared when an additional Ti flux was provided between the TiAl/TiSi2 reaction. The growth kinetics for both the TiAl/TiSi2 (direction reaction) and TiAl/Ti/TiSi2 reactions (Ti biased reaction) were identified, and a comparison of the morphology of the product phases was provided. The chemical potential variation and mass balance exhibited guidance in predicting the diffusion pathway during isothermal annealing. It appears that a biasing reaction (i.e., controlling component flux) is an effective tool for the phase selection and morphology changes during isothermal annealing.

Keywords

reaction diffusion biased reaction chemical potential 

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Copyright information

© Springer 2007

Authors and Affiliations

  • J. S. Park
    • 1
  • J. Cho
    • 1
  • B. Y. Hur
    • 2
  • J. H. Perepezko
    • 3
  1. 1.Materials and Parts Team, Gwangju Research CenterKorea Institute of Industrial TechnologyGwangjuKorea
  2. 2.School of Nano and Advanced Materials EngineeringGyeongsang National UniversityGyeongnamKorea
  3. 3.Department of Materials Science and EngineeringUniversity of Wisconsin-MadisonMadisonUSA

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