Interstitially strengthened metastable FeCoCr-based medium-entropy alloys with both high strength and large ductility
Research output: Journal Publications and Reviews (RGC: 21, 22, 62) › 21_Publication in refereed journal › peer-review
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Original language | English |
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Article number | 051902 |
Journal / Publication | Applied Physics Letters |
Volume | 119 |
Issue number | 5 |
Publication status | Published - 2 Aug 2021 |
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Link to Scopus | https://www.scopus.com/record/display.uri?eid=2-s2.0-85112277980&origin=recordpage |
Permanent Link | https://scholars.cityu.edu.hk/en/publications/publication(7ef96713-7982-4dae-8199-49a0bb2587ed).html |
Abstract
We investigated the effect of interstitial solutes on the phase stability and tensile properties of metastable FeCoCr-based medium-entropy alloys (MEAs). Thermodynamic calculations indicate that the interstitial carbon atom acts as an austenite stabilizer and suppresses the thermally induced martensite formation. With the benefit from interstitial strengthening, carbon-doped FeCoCr-based MEAs have demonstrated an enhanced tensile strength as compared with the undoped counterpart. Originated from the phase metastability and low stacking-fault energy, the martensitic transformation can be activated upon the plastic deformation, leading to the dynamic microstructural refinement. In this way, the significantly improved strength with a maintained tensile ductility can be achieved in the developed MEAs. Our findings have demonstrated that the incorporation of interstitial solutes into metastable alloys contributes to the development of high-performance alloys with a superior strength-ductility synergy.
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Interstitially strengthened metastable FeCoCr-based medium-entropy alloys with both high strength and large ductility. / Cao, Boxuan; Wang, Cheng; Yang, Tao et al.
In: Applied Physics Letters, Vol. 119, No. 5, 051902, 02.08.2021.
In: Applied Physics Letters, Vol. 119, No. 5, 051902, 02.08.2021.
Research output: Journal Publications and Reviews (RGC: 21, 22, 62) › 21_Publication in refereed journal › peer-review
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