Journal of the Korean Crystal Growth and Crystal Technology (한국결정성장학회지)

The Korea Association of Crystal Growth (한국결정성장학회)
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Fe-rich precipitates in hot-pressed $TiB_{2}$

고온가압소결된 $TiB_{2}$에서의 철을 함유한 석출물

  • Kwang Bo Shim (Ceramic Materials Research Institute, Hanyang University, Seoul 133-791, Korea) ;
  • Keun Ho Auh (Ceramic Materials Research Institute, Hanyang University, Seoul 133-791, Korea) ;
  • Brian Ralph (Department of Materials Technology, Brunel University of West London, U.K.)
  • Published : 1996.08.01
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Abstract

Transmission electron microscopy has been used to investigate the microstructure of hot-pressed $TiB_{2}$. Thin foil specimens, prepared by conventional ion beam thinning, revealed many features which originated from the crystallographic anisotropy of hexagonal $TiB_{2}$. It was observed that in these specimens Fe-impurities are precipitated to form secondary Fe-rich phases at grain triple edges, in grain boundaries and sometimes in-grain. These Fe-rich precipitates were characterised by their coherence or semi-coherence to a favourably oriented grain at a grain triple edge or grain boundaries or to the matrix $TiB_{2}$ phase.

투과전자현미경을 이용하여 고온가압소결된 $TiB_{2}$의 미세구조를 분석하였다. Ionbeam thinning에 의해서 준비된 박편시편은 육방정계 $TiB_{2}$의 결정학적 이방성에 기인한 특징을 보여주었다. 이들 시편에서 철분 불순물은 결정입 3중점, 결정입계 그리고 결정내에 2차상을 형성하는 것으로 확인되었고, 결정입 3중점이나 결정입계 혹은 matrix에서 유리하게 배향된 결정입에 coherence or semi-coherence한 특징을 나타내었다.

Keywords

References

  1. Metal Progress v.82 J.D. Latva
  2. Handbook of High-Temperature materials ; NO.1 materials Index P.T. Shatter
  3. Microindentation hardness Testing P.W. Mott
  4. J. Am. Ceram. Soc. v.67 A.D. McLeod;J.S. Haggerty;D. R. Sadoway
  5. Am. Ceram. Soc. Bull. v.66 C.H. McMurtry;W.D.G. Boecker;S.G. Seshadri;J.S. Zanghi;J.E. Garnier
  6. J. Mater. Sci. v.25 H. Itoh;S. Naka;T. matsudaira;H. Hamamoto
  7. Progress in Boron Chemistry v.Ⅱ R. Thompson;R.J. Brotherton(ed.);H. Steinberg(ed.)
  8. Material & Design v.11 P.C. Cobb
  9. J. Metals v.33 J.B. Todd
  10. J. Mater. Sci. Letts. v.9 T.R. Shrout;A. Casciani;M. Mulvihill;D. Smith;W. Heubner
  11. Amer. Ceram. Soc. Bull v.72 C. Mroz
  12. J. Am. Ceram. Soc. v.70 S. Baik;P.F. Becher
  13. Am. Ceram. Soc. Bull. v.61 T. Watanabe;S. Kouno
  14. J. Am. Ceram. Soc. v.72 E.S. kang;C.W. Jang;C.H. Lee;C.H. Kim
  15. J. Am. Ceram. Soc. v.68 J.R. Ramberg;C.F. Wolfe;W.S. Williams
  16. J. Mater. Sci. v.22 J.R. Ramberg;W.S. Williams
  17. Mater. Char. v.31 K.B. Shim;J. Kwiencinski;M.J. Edirisinghe;B. Ralph
  18. Ceram. Inter. v.19 L. Michalowsky;H. Baumgartner;W. Ernst W
  19. J. Am. Ceram. Soc. v.70 W.A. Zdaniewski
  20. Modern Physical Metallurgy (4th ed.) R.E. Smallman