| 학회 | 한국재료학회 |
| 학술대회 | 2021년 가을 (11/24 ~ 11/26, 경주 라한호텔) |
| 권호 | 27권 2호 |
| 발표분야 | D. 구조 재료 분과 |
| 제목 | Experimental investigation on effect of Y2O3 nanoparticles on microstructure and mechanical properties of W-Y2O3 ODS alloy |
| 초록 | Oxide dispersion strengthened tungsten (ODS-W) alloy has made great progress as a strategy to overcome the brittleness of tungsten, especially introducing stable Y2O3 as a secondary phase which induces densification and refining effects of the tungsten matrix. The various sizes, distributions and volume fractions of Y2O3 particles are critical factors affecting not only the Zener pinning effect but also the chemical state and microstructure of the W-Y2O3 composites. To date, the sintering behavior of W-Y2O3 composite is still indistinct and required further discussion, because the existence of Y2O3 in the W matrix increases the complexity of interaction in the system during sintering. Nevertheless, most of the research has been focused on methodologies for synthesis, and some studies have only suggested the existence of a ternary oxide phase with a low melting point and the eutectic temperature of W-Y2O3 lower than the sintering temperature without observation of liquid sintering. In addition, with respect to the previous study showing that the mechanical properties of the W-Y2O3 alloy deteriorated with the increase of the secondary phase, it is necessary to confirm the validity of the existing outcome in the state of homogeneous dispersion of Y2O3 nanoparticles without coarsening and segregation. In this study, the methodology of ultrasonic spray pyrolysis followed by spark plasma sintering, obtaining a W-based alloy with homogeneously dispersed Y2O3 nanoparticles, was applied to 1~10wt% Y2O3 controlled fraction conditions. As result, the effect of Y2O3 addition on the sintering behavior and grain growth of W-Y2O3 was systematically elucidated through the microstructural and physicochemical analysis. Furthermore, an optimal fraction expressing high-performance mechanical properties was derived. |
| 저자 | 김정현, 지명준, 류철희, 이영인 |
| 소속 | 서울과학기술대 |
| 키워드 | Oxide dispersion strengthened alloy; Ultrasonic spray pyrolysis; Y<SUB>2</SUB>O<SUB>3</SUB> fraction; Sintering behavior; Mechanical property |
