Journal of the Korean Society for Heat Treatment (열처리공학회지)

The Korean Society for Heat Treatment (한국열처리공학회)
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The Effects of Oxygen Content on Microstructure and Mechanical Properties of Ti-Al-Fe-Si-O alloy

산소함량에 따른 Ti-Al-Fe-Si-O 합금의 기계적 특성 및 미세조직 변화

  • Bae, Jin Joo (Metallic Materials Division, Korea Institute of Materials Science) ;
  • Yeom, Jong Taek (Metallic Materials Division, Korea Institute of Materials Science) ;
  • Park, Chan Hee (Metallic Materials Division, Korea Institute of Materials Science) ;
  • Hong, Jae Keun (Metallic Materials Division, Korea Institute of Materials Science) ;
  • Kim, Senog Woong (Metallic Materials Division, Korea Institute of Materials Science) ;
  • Yoon, Seog Young (School of Materials Science and Engineering, Pusan National University) ;
  • Lee, Sang Won (Metallic Materials Division, Korea Institute of Materials Science)
  • 배진주 (재료연구소 금속재료연구본부) ;
  • 염종택 (재료연구소 금속재료연구본부) ;
  • 박찬희 (재료연구소 금속재료연구본부) ;
  • 홍재근 (재료연구소 금속재료연구본부) ;
  • 김성웅 (재료연구소 금속재료연구본부) ;
  • 윤석영 (부산대학교 재료공학과) ;
  • 이상원 (재료연구소 금속재료연구본부)
  • Received : 2016.09.07
  • Accepted : 2016.10.04
  • Published : 2016.11.30
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Abstract

The effect of the oxygen content and the annealing temperature on the tensile behavior of the Ti-1.5Al-3Fe-0.25Si-(0.1~0.5)O alloy was investigated. The tensile properties were dependent on the volume fraction of the microstructure constituents, i.e. the equixed ${\alpha}$, equixed ${\beta}$ and lamellar ${\alpha}$. The results showed that the O-partitioned equixed ${\alpha}$ had a much higher strength compared to the equixed ${\beta}$. The strength of the lamellar ${\alpha}$ increased with increasing the annealing temperature because the O content of the lamellar ${\alpha}$ increased. Ti-1.5Al-3Fe-0.25Si-0.3O alloy annealed to $900^{\circ}C$ where the volume fraction of lamellar ${\alpha}$ was the highest exhibited an excellent combination of the strength (1198.5 MPa) and ductility (27.5%). The effect of the lamellar ${\alpha}$ on the ductility was discussed.

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References

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