In this study, lanthanum oxide (La2O3) dispersed molybdenum (Mo–La2O3) alloys are fabricated using lanthanum nitrate solution and nanosized Mo particles produced by hydrogen reduction of molybdenum oxide. The effect of La2O3 dispersion in a Mo matrix on the fracture toughness at room temperature is demonstrated through the formation behavior of La2O3 from the precursor and three-point bending test using a single-edge notched bend specimen. The relative density of the Mo–0.3La2O3 specimen sintered by pressureless sintering is approximately 99%, and La2O3 with a size of hundreds of nanometers is uniformly distributed in the Mo matrix. It is also confirmed that the fracture toughness is 19.46 MPa·m1/2, an improvement of approximately 40% over the fracture toughness of 13.50 MPa·m1/2 on a pure-Mo specimen without La2O3, and this difference in the fracture toughness occurs because of the changes in fracture mode of the Mo matrix caused by the dispersion of La2O3.

Abstract
 1. 서 론
 2. 실험방법
 3. 결과 및 고찰
 4. 결 론
 References

• 최원준(한양대학교 신소재공학과) | Won June Choi (Department of Materials Science and Engineering, Hanyang University)
• 박천웅(한양대학교 신소재공학과) | Chun Woong Park (Department of Materials Science and Engineering, Hanyang University)
• 박정효(국방과학연구소) | Jung Hyo Park (Agency for Defense Development)
• 김영도(한양대학교 신소재공학과) | Young Do Kim (Department of Materials Science and Engineering, Hanyang University) Corresponding Authors
• 변종민(서울과학기술대학교 신소재공학과) | Jongmin Byun (Department of Materials Science and Engineering, Seoul National University of Science and Technology) Corresponding Authors