Korean Journal of Materials Research (한국재료학회지)

Materials Research Society of Korea (한국재료학회)
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High Temperature Oxidation of Thermomechanically Treated Ti-45.4%Al-4.8%Nb Alloys

열기계적 처리한 Ti-45.4%Al-4.8%Nb 합금의 고온산화

  • Kim Jae-Woon (Center for Advanced Plasma Surface Technology, Sungkyunkwan University) ;
  • Lee Dong-Bok (Center for Advanced Plasma Surface Technology, Sungkyunkwan University)
  • 김재운 (성균관대학교 플라즈마응용 표면기술 연구센터) ;
  • 이동복 (성균관대학교 플라즈마응용 표면기술 연구센터)
  • Published : 2004.07.01
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Abstract

The thermomechanically treated $Ti-45.4\%Al-4.8\%Nb(at\%)$ alloy was oxidized between 800 and $1000^{\circ}C$ in air, and the oxidation characteristics were studied. The dissolution of Nb in the oxide scale was observed from the TEM study. The Pt marker test revealed that the oxidation process was controlled by the outward diffusion of Ti ions and the inward diffusion of oxygen ions. During oxidation, the evaporation of Nb-oxides was found to occur to a small amount. Niobium tended to pile-up at the lower part of the oxide scale, which consisted primarily of an outer $TiO_2$ layer, and an intermediate $Al_{2}O_{3}-rich$ layer, and an inner mixed layer of ($TiO_{2}+Al_{2}O_{3}$).

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References

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