Journal of Powder Materials (한국분말재료학회지)

The Korean Powder Metallurgy & Materials Institute (한국분말재료학회 (*구 분말야금학회))
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The Use of TiH2 to Refine Y2Ti2O7 in a Nano Mo-ODS Alloy

TiH2를 이용한 nano Mo-ODS 합금의 Y2Ti2O7 미세화 연구

  • Yuncheol Ha (Department of Materials Science and Engineering, Hanyang University) ;
  • Chun Woong Park (Department of Materials Science and Engineering, Hanyang University) ;
  • Won Hee Lee (Department of Materials Science and Engineering, Hanyang University) ;
  • Jongmin Byun (Department of Materials Science and Engineering, Seoul National University of Science and Technology) ;
  • Young Do Kim (Department of Materials Science and Engineering, Hanyang University)
  • 하윤철 (한양대학교 신소재공학과) ;
  • 박천웅 (한양대학교 신소재공학과) ;
  • 이원희 (한양대학교 신소재공학과) ;
  • 변종민 (서울과학기술대학교 신소재공학과) ;
  • 김영도 (한양대학교 신소재공학과)
  • Received : 2024.07.23
  • Accepted : 2024.08.26
  • Published : 2024.10.28
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Abstract

Mo-ODS alloys have excellent mechanical properties, including an improved recrystallization temperature, greater strength due to dispersed oxides, and the ability to suppress grain growth at high temperatures. In ODS alloys, the dispersed Y2O3 and added Ti form Y-Ti-O complex oxides, producing finer particles than those in the initial Y2O3. The complex oxides increase high-temperature stability and improve the mechanical properties of the alloy. In particular, the use of TiH2 powder, which is more brittle than conventional Ti, can enable the distribution of finer oxides than is possible with conventional Ti powder during milling. Moreover, dehydrogenation leads to a more refined powder size in the reduction process. This study investigated the refinement of Yi2Ti2O7 in a nano Mo-ODS alloy using TiH2. The alloy compositions were determined to be Mo-0.5Ti-0.5Yi2O3 and Mo-1.0Ti-0.5Yi2Oi2. The nano Mo-ODS alloys were fabricated using Ti and TiH2 to explore the effects of adding different forms of Ti. The sintered specimens were analyzed through X-ray diffraction for phase analysis, and the microstructure of the alloys was analyzed using scanning electron microscopy and transmission electron microscopy. Vickers hardness tests were conducted to determine the effect of the form of Ti added on the mechanical properties, and it was found that using TiHi2 effectively improved the mechanical properties.

Keywords

Acknowledgement

본 연구는 2016년도 정부(교육부)의 재원으로 한국연구재단의 지원을 받아 수행된 기초연구사업임(2016R1A6A1A03013422), 본 연구는 2016년도 정부(교육부)의 재원으로 한국연구재단의 지원을 받아 수행된 기초연구사업임 (2022R1A2C10113).

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