|About this Abstract
||1st World Congress on High Entropy Alloys (HEA 2019)
||High Entropy Alloys 2019
||Creep Properties of High Entropy Alloys Having a Single FCC Crystal Structure at Elevated Temperature
||Min-Gu Jo, Jin-Yoo Suh, Woo-Sang Jung, Heung Nam Han
|On-Site Speaker (Planned)
In this study, creep test was carried out at temperature ranging from 650 to 725℃ under the stress range of 50~200 MPa with CrMnFeCoNi quinary and CrFeCoNi quaternary high entropy alloys. Before and after creep test, SEM-EDS/EBSD and X-ray diffraction analyses were performed to discuss microstructural development, and tensile properties and Vickers hardness were evaluated. Both alloys showed the single face-centered cubic crystal structure and similar mechanical properties at room temperature and elevated temperatures but significantly different creep rupture life. The quaternary CrFeCoNi high entropy alloy showed much longer creep rupture life than the CrMnFeCoNi alloy. The reason for this difference will be discussed in terms of the fcc phase stability and the degree of solid solution strengthening.