| 학회 | 한국재료학회 |
| 학술대회 | 2017년 봄 (05/17 ~ 05/19, 목포 현대호텔) |
| 권호 | 23권 1호 |
| 발표분야 | D. 구조 재료 분과 |
| 제목 | Influence of additional elements on the microstructure and mechanical behaviors of TiZrHfNiCuM high-entropy alloy system |
| 초록 | The conventional strategy for developing metallurgical alloys has been based mainly on one principal element. This alloy concept reaches the limit therefore the development of a new paradigm of advanced metallic materials of interest in high-entropy alloys (HEAs) is emerging. In previous study, describe the microstructure and mechanical properties of (Ti33Zr33Hf33)-(Ni50Cu50). Series of HEAs have been designed using an equiatomic substitution alloy strategy, so that their microstructure and mechanical properties could be compared to see the effect of different elemental contents. (Ti33Zr33Hf33)60(Ni50Cu50)40 composites with equiatomic components show the best properties. Based on these results, in this study, alloys with composition of equi-atomic substituted TiZrHfNiCu, TiZrHfNiCuNb, TiZrHfNiCuCo and TiZrHfNiCuFe high-entropy alloys (HEAs) were produced by suction casting method. The effects of addition elements on phase composition, microstructure and mechanical behaviors of the HEA were studied. The suction casted Ti20Zr20Hf20Ni20Cu20 HEA exhibits single C14 Laves phase (MgZn2-type) with fine homogeneous microstructure. When Co, Nb or Fe elements are added, morphologies are slightly modulated toward well-developed dendritic microstructure, phase constitutions are significantly changed from single Laves phase to mixed multi-phases as well as mechanical properties are also altered with increased plasticity and high strength. It is believed that modulated mechanical properties are mainly ascribed to the change of phase constitution and crystalline structure, together with the microstructural characteristics. This clearly reveals that the selection and addition of supplementary elements based on the formation rule for HEAs play an important role on the evolution of phase, microstructural morphology and mechanical properties of Ti20Zr20Hf20Ni20Cu20 HEA. The characteristics of the microstructure formation in the studied alloys were discussed. |
| 저자 | Hae Jin Park, Young Seok Kim, Taek Jib Choi, Ki Buem Kim |
| 소속 | Sejong Univ. |
| 키워드 | High Entropy Alloys; equiatomic substitution; microstructure; mechanical properties |
