한국표면공학회지 (Journal of the Korean institute of surface engineering)

  • 제39권6호
  • /
  • Pages.288-294
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  • 2006
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  • 1225-8024(pISSN)
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  • 2288-8403(eISSN)
한국표면공학회 (The Korean Institute of Surface Engineering)
권호 표지

Ti-34wt%Al-1.5wt%Mn 합금의 고온산화에 미치는 $Y_2O_3$ 분산입자 첨가효과

The Effect of $Y_2O_3$ Dispersoids on the High Temperature Oxidation of Ti-34wt%Al-1.5wt%Mn Alloys

  • 이동복 (성균관대학교 신소재공학부)
  • Lee, Dong-Bok (School of Advanced Materials Science & Engineering, Sungkyunkwan University)
  • 발행 : 2006.12.31
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초록

Alloys of TiAl-Mn-(0, 5, 10)wt.% $Y_2O_3$ were prepared by a powder metallurgical route, and their oxidation behavior was studied at 800, 900 and $1000^{\circ}C$ in 1 atm of air. The scale formed on the alloys consisted of $TiO_2$ and $Al_2O_3$ oxides. During oxidation, Mn tended to diffuse outward, whereas oxygen diffused inward. The dispersoids of $T_2O_3$, which segregated at the matrix grain boundaries, acted as a diffusion channel for cations and oxygen ions, nucleation sites for oxides, and vacancy annihilation sites. $T_2O_3$ increased the scale thickness, but improved the scale adherence.

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