Crack-resistant sigma/FCC interfaces in the Fe40Mn40Co10Cr10 high entropy alloy with the dispersed sigma-phase
- Title
- Crack-resistant sigma/FCC interfaces in the Fe40Mn40Co10Cr10 high entropy alloy with the dispersed sigma-phase
- Author
- 김진경
- Keywords
- High-entropy alloy; Mechanical properties; Sigma (sigma) phase; Nanoindentation; Microcrack
- Issue Date
- 2022-01
- Publisher
- Elsevier BV
- Citation
- Materials Science and Engineering: A, v. 831.0, article no. 142039, Page. 1-7
- Abstract
- We report the role of morphology and size of the a-phase on mechanical properties of the Fe40Mn40Co10Cr10 non-equiatomic high entropy alloy. The dispersed and fine sigma-precipitates formed after cold-rolling and annealing at 700 degrees C for 1 h lead to an increase in strength without severe ductility loss compared to the material without the sigma-phase. However, the coarsened and connected sigma-phase formed after prolonged annealing at 700 degrees C for 100 h results in early failure due to the activation of microcracks along sigma/sigma interfaces. The sigma/FCC interface could act as strong obstacles for dislocation motion and could effectively relieve the stress concentration by activating deformation twins or dislocations. The sigma/FCC interfaces are excellent in terms of hardening, accommodation of plastic deformation, and stress relaxation leading to the observed crack resistance. Therefore, we suggest that increasing sigma/FCC interfaces by controlling size and dispersion of the sigma-phase is essential to develop HEAs with an excellent strength-ductility combination and damage tolerance.
- URI
- https://www.sciencedirect.com/science/article/pii/S0921509321013034?pes=vorhttps://repository.hanyang.ac.kr/handle/20.500.11754/177644
- ISSN
- 0921-5093;1873-4936
- DOI
- 10.1016/j.msea.2021.142039
- Appears in Collections:
- COLLEGE OF ENGINEERING SCIENCES[E](공학대학) > MATERIALS SCIENCE AND CHEMICAL ENGINEERING(재료화학공학과) > Articles
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