Korean Journal of Materials Research (한국재료학회지)

Materials Research Society of Korea (한국재료학회)
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Effect of Fe on the High Temperature Oxidation of Ti-Al-Fe Alloys

Ti-Al-Fe계 합금의 고온산화거동에 미치는 Fe의 영향

  • Yoon, Jang-Won (Department of Materials Science and Engineering, Pusan National University) ;
  • Hyun, Yong-Taek (Special Alloys Research Group, Korea Institute of Materials Science (KIMS)) ;
  • Kim, Jeoung-Han (Special Alloys Research Group, Korea Institute of Materials Science (KIMS)) ;
  • Yeom, Jong-Taek (Special Alloys Research Group, Korea Institute of Materials Science (KIMS)) ;
  • Yoon, Seog-Young (Department of Materials Science and Engineering, Pusan National University)
  • 윤장원 (부산대학교 재료공학부) ;
  • 현용택 (재료연구소 특수합금연구그룹) ;
  • 김정한 (재료연구소 특수합금연구그룹) ;
  • 염종택 (재료연구소 특수합금연구그룹) ;
  • 윤석영 (부산대학교 재료공학부)
  • Received : 2011.05.09
  • Accepted : 2011.05.30
  • Published : 2011.07.27
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Abstract

In this paper, high temperature oxidation behavior of newly developed alloys, Ti-6Al-4Fe and Ti-6Al-1Fe, is examined. To understand the effect of Fe on the air oxidation behavior of the Ti-Al-Fe alloy system, thermal oxidation tests are carried out at $700^{\circ}C$ and $800^{\circ}C$ for 96 hours. Ti-6Al-4V alloy is also prepared and tested under the same conditions for comparison with the developed alloys. The oxidation resistance of the Ti-Al-Fe alloy system is superior to that of Ti-6Al-4V alloy. Ti-6Al-4V shows the worst oxidation resistance for all test conditions. This is not a result of the addition of Fe, but rather it is due to the elimination of V, which has deleterious effects on high temperature oxidation. The oxidation of the Ti-Al-Fe alloy system follows the parabolic rate law. At $700^{\circ}C$, Fe addition does not have a noticeable influence on the amount of weight gain of all specimens. However, at $800^{\circ}C$, Ti-6Al-4Fe alloy shows remarkable degradation compared to Ti-6Al-1Fe and Ti-6Al. It is discovered that the formation of $Al_2O_3$, a diffusion resistance layer, is remarkably hindered by a relative decrease of the ${\alpha}$ volume fraction. This is because Fe addition increases the volume fraction of ${\beta}$ phase within the Ti-6Al-xFe alloy system. Activities of Al, Ti, and Fe with respect to the formation of oxide layers are calculated and analyzed to explore the oxidation mechanism.

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References

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