Journal of Powder Materials (한국분말재료학회지)

The Korean Powder Metallurgy & Materials Institute (한국분말재료학회 (*구 분말야금학회))
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Microstructure and Mechanical Properties of Oxide Dispersion Strengthened alloy Based on Commercially Pure Titanium

순수 타이타늄 기반 산화물분산강화 합금의 미세조직 및 기계적 특성

  • Park, Taesung (Department of Materials Science & Engineering, Hanbat National University) ;
  • Kim, Jeoung Han (Department of Materials Science & Engineering, Hanbat National University)
  • 박태성 (한밭대학교 신소재공학과) ;
  • 김정한 (한밭대학교 신소재공학과)
  • Received : 2018.08.09
  • Accepted : 2018.08.17
  • Published : 2018.08.28
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Abstract

This study is conducted as a preliminary research to verify the feasibility of Ti-based Oxide dispersion strengthened (ODS) alloy. Pure-Ti powder is mixed with $Y_2O_3$ powder and subsequently, mechanically alloyed at $-150^{\circ}C$. The Ti-based ODS powder is hot-isostatically pressed and subsequently hot-rolled for recrystallization. The microstructure consists of elongated grains and Y excess fine particles. The oxide particle size is larger than that of the typical Fe-based ODS steel. Tensile test shows that the tensile ductility is approximately 25%, while the strength is significantly higher than that of pure Ti. The high-temperature hardness of the Ti-ODS alloy is also significantly higher than that of pure Ti at all temperatures, while being lower than that of Ti-6Al-4V. The dimple structure is well developed, and no evidence of cleavage fracture surface is observed in the fracture surface of the tensile specimen.

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References

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