Role of brittle sigma phase in cryogenic-temperature-strength improvement of non-equi-atomic Fe-rich VCrMnFeCoNi high entropy alloys
SCIE
SCOPUS
- Title
- Role of brittle sigma phase in cryogenic-temperature-strength improvement of non-equi-atomic Fe-rich VCrMnFeCoNi high entropy alloys
- Authors
- Jo, Yong Hee; Choi, Won-Mi; Sohn, Seok Su; Kim, Hyoung Seop; Lee, Byeong-Joo; Lee, Sunghak
- Date Issued
- 2018-05
- Publisher
- ELSEVIER SCIENCE SA
- Abstract
- An equi-atomic single-fcc-phase CrMnFeCoNi high entropy alloy (HEA) shows much higher tensile properties at cryogenic temperature than at room temperature because of its fee characteristics and abundant twinning at cryogenic temperature. In order to further improve the cryogenic-temperature tensile properties of single-fcc-phase HEAs, we propose non-equi-atomic Fe-rich VCrMnFeCoNi HEAs, and analyze the strengthening effects of the brittle intermetallic sigma (sigma) phase. The sigma phase is unintentionally obtained, but favorably shows a pronounced strengthening by its hardness and grain refinement effect due to grain-boundary pinning, which leads to high yield and tensile strengths of 0.76 GPa and 1.23 GPa, respectively, together with good ductility of 54%. This positive utilization of the sigma phase is unexpected because its formation has been suppressed in typical HEAs. Our results demonstrate that the present Fe-rich VCrMnFeCoNi design and o-phase strengthening has potential in high-strength HEA studies.
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/95897
- DOI
- 10.1016/j.msea.2018.03.115
- ISSN
- 0921-5093
- Article Type
- Article
- Citation
- MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, vol. 724, page. 403 - 410, 2018-05
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