| 학회 | 한국재료학회 |
| 학술대회 | 2020년 가을 (11/18 ~ 11/20, 휘닉스 제주 섭지코지) |
| 권호 | 26권 1호 |
| 발표분야 | 특별심포지엄2. 고엔트로피합금 개발과 응용 심포지엄-오거나이저: 박노근(영남대) |
| 제목 | Development of powder materials for structural and functional high entropy alloys applications using rapid solidification processes |
| 초록 | In the recent years, the multicomponent high entropy alloys (HEAs) have been acquired a considerable attention in materials science and technology owing to its outstanding mechanical properties including excellent strength and toughness, good thermal stability, superior corrosion and wear resistance. The fabrication process and controlling microstructure are the key factors for enhancing structural and mechanical properties. For instance, inert rapid solidification processes such as gas atomization and water atomization are an excellent large-scale, capable to modify to the microstructure, and cost-effective methods for producing various kinds of metal and other alloy powders for commercial purpose. In this work, we have fabricated high entropy alloys and functional materials alloy powders by gas atomization and water atomization processes. The obtained gas atomization alloy powders exhibit a spherical shape whereas the water atomization shows irregular shapes. Both powders exhibit refined microstructure and excellent chemical homogeneity. The phase analysis and microstructural characteristics of alloy powders were characterized using the X-ray diffraction and scanning electron microscopy respectively. The chemical composition and oxygen concentration of the alloy powders were examined using SEM-EDS and ONH analysis respectively. Meanwhile, we thoroughly investigated other powder characteristics including particle size, shape, flowability, compressibility, tap density and mechanical strength of alloy powders according to the powder size behavior. In addition, we have studied the wear properties of CoCrFeMnNi HEAs under different operating conditions of sliding time, normal load and velocity using ball-on-disc tribometer. The obtained friction and wear properties were systematically investigated using microscopic techniques. This study indicating that gas atomization and water atomization could be a reliable method for producing high-quality metallic powders with large-scale and a low-cost way for commercial use. |
| 저자 | K. Y. Jeong1, J. W. Song1, C. Nagarjuna1, M. Babu1, Y. S. Na2, H. S. Kim3, S. J. Hong1 |
| 소속 | 1Kongju National Univ., 2Korea Institute of Materials Science (KIMS), 3Pohang Univ. of Science and Technology (POSTECH) |
| 키워드 | Rapid solidification; Hierarchical structures; Metallic powders; Powder characterizations. |
