Journal of Powder Materials (한국분말재료학회지)

The Korean Powder Metallurgy & Materials Institute (한국분말재료학회 (*구 분말야금학회))
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Fabrication of Molybdenum Alloys with Improved Fracture Toughness through the Dispersion of Lanthanum Oxide

란타넘 산화물의 분산을 통해 향상된 파괴인성을 갖는 몰리브데넘 합금의 제조

  • Choi, Won June (Department of Materials Science and Engineering, Hanyang University) ;
  • Park, Chun Woong (Department of Materials Science and Engineering, Hanyang University) ;
  • Park, Jung Hyo (Agency for Defense Development) ;
  • Kim, Young Do (Department of Materials Science and Engineering, Hanyang University) ;
  • Byun, Jongmin (Department of Materials Science and Engineering, Seoul National University of Science and Technology)
  • 최원준 (한양대학교 신소재공학과) ;
  • 박천웅 (한양대학교 신소재공학과) ;
  • 박정효 (국방과학연구소) ;
  • 김영도 (한양대학교 신소재공학과) ;
  • 변종민 (서울과학기술대학교 신소재공학과)
  • Received : 2019.06.15
  • Accepted : 2019.06.21
  • Published : 2019.06.28
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Abstract

In this study, lanthanum oxide ($La_2O_3$) dispersed molybdenum ($Mo-La_2O_3$) alloys are fabricated using lanthanum nitrate solution and nanosized Mo particles produced by hydrogen reduction of molybdenum oxide. The effect of $La_2O_3$ dispersion in a Mo matrix on the fracture toughness at room temperature is demonstrated through the formation behavior of $La_2O_3$ from the precursor and three-point bending test using a single-edge notched bend specimen. The relative density of the $Mo-0.3La_2O_3$ specimen sintered by pressureless sintering is approximately 99%, and $La_2O_3$ with a size of hundreds of nanometers is uniformly distributed in the Mo matrix. It is also confirmed that the fracture toughness is $19.46MPa{\cdot}m^{1/2}$, an improvement of approximately 40% over the fracture toughness of $13.50MPa{\cdot}m^{1/2}$ on a pure-Mo specimen without $La_2O_3$, and this difference in the fracture toughness occurs because of the changes in fracture mode of the Mo matrix caused by the dispersion of $La_2O_3$.

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