Transactions of Materials Processing (소성∙가공)

The Korean Society for Technology of Plasticity and materials processing (한국소성∙가공학회)
권호 표지

Effects of Cr and Nb on the nigh Temperature Oxidation of TiAl

  • D.B. Lee (성균관대학교 Center for Advanced Plasma Surface Technology) ;
  • K.B. Park (성균관대학교 Center for Advanced Plasma Surface Technology) ;
  • M. Nakamura (성균관대학교 National Institute for Materials Science)
  • Published : 1999.06.01

⟨ Previous Next ⟩

Abstract

From isothermal and cyclic oxidation tests on thermomechanically treated Ti-5%Al, Ti47%Al-4%Cr, and Ti-48%Al-2%Cr-2%Nb alloys at 800, 900, 1000℃ in air, it was found that Ti-48%Al-2%Cr-2%Nb and Ti-47%Al-4%Cr had the best and the worst oxidation resistance, respectively. The oxide scales consisted primarily of TiO₂and Al₂O₃, with and without a small amount of dissolved Cr and 7b ions, depending on the alloy composition. These ions were slightly enriched inside the inner oxide layer, and strongly enriched around the scale-matrix interface. The outer TiO₂-rich layer was formed by the outward diffusion of Ti ions, while the inner (TiO₂+A1₂O₃,) mixed layer was formed by the inward transport of oxygen. The outward movement of Al ions farmed the intermediate Al₂O₃-rich Iayer, above talc prepared alloys.

Keywords

References

  1. JOM v.41 no.July Y.W.Kim
  2. JOM v.46 no.July Y.W.Kim
  3. High Temperature Aluminides and Intermetallics Y.W.Kim;F.H.Froes;S.H.Whang(ed.);C.T.Liu(ed.);D.P.Pope(ed.);J.O.Stiegler(ed.)
  4. Intermetallics v.6 M.Nakamura;M.Nobuki;T.Tanabe;T.Kumagai;I.Mutoh;E.Abe
  5. Scripta mater. v.34 T.Kumagai;M.Nakamura
  6. JOM v.51 no.June I.C.I.Okafor;R.G.Reddy
  7. J. Kor. Inst. Met. & Mater. v.38 H.G.Jung;C.H.Oh;K.Y.Kim
  8. J. Kor. Inst. Met. & Mater. v.36 J.H.Won;Y.J.Kim;S.W.An;D.B.Lee
  9. Intermetallics v.7 V.A.C.Haanappel;J.D.sunderkotter;M.F.Stroosnijder
  10. Oxidation of High Temperature Intermetallics G.Welsch;A.I.Kahveci;T.Grobstein(ed.);J.Doychak(ed.)
  11. JOM v.48 no.Nov M.P.Brady;W.J.Brindley;J.L.Smialek;I.E.Locci
  12. Structural Intermetallics S.A.Kekare;D.K.Shelton;P.B.Asawath;R.Darolia(ed.);J.J.Lewandowski(ed.);C.T.Liu(ed.);P.L.Martin(ed.);D.B.Mirade(ed.);M.V.Nathal(ed.)
  13. Oxid. Met. v.54 D.B.Lee;Y.C.Lee;Y.J.Kim;S.W.Park
  14. Oxid. Met. v.38 S.Becker;A.Rahmel;M.Schorr;M.Schutze