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Novel Co-rich high performance twinning-induced plasticity (TWIP) and transformation-induced plasticity (TRIP) high-entropy alloys
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering.
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2019 (English)In: Scripta Materialia, ISSN 1359-6462, E-ISSN 1872-8456, Vol. 165, p. 39-43Article in journal (Refereed) Published
Abstract [en]

The equiatomic CoCrMnNiFe high-entropy alloy (HEA) has attracted much attention owing to its exceptional mechanical properties. Here, we designed novel face-centered cubic (fcc) phase Co-rich non-equiatomic CoCrMnNiFe HEAs with tensile properties superior to the counterparts, derived from lowering stacking fault energy (SFE) via modifying constituent concentrations. The decrease of Mn, Ni, Fe meanwhile increase of Co, Cr concentrations does reduce the SFE value, based on ab initio and thermodynamics calculations. Hereinto, Co 35 Cr 20 Mn 15 Ni 15 Fe 15 and Co 35 Cr 25 Mn 15 Ni 15 Fe 10 HEAs overcame the strength-ductility trade-off, contributing to twinning-induced plasticity (TWIP) or transformation-induced plasticity (TRIP) effects, respectively. The present study sheds light on developing high performance HEAs.

Place, publisher, year, edition, pages
Acta Materialia Inc , 2019. Vol. 165, p. 39-43
Keywords [en]
Deformation twinning, High-entropy alloy, Martensitic transformation, Phase stability, Stacking fault energy
National Category
Other Materials Engineering
Identifiers
URN: urn:nbn:se:kth:diva-246437DOI: 10.1016/j.scriptamat.2019.02.018ISI: 000463127300009Scopus ID: 2-s2.0-85061534472OAI: oai:DiVA.org:kth-246437DiVA, id: diva2:1301484
Note

QC 20190402

Available from: 2019-04-02 Created: 2019-04-02 Last updated: 2019-04-29Bibliographically approved

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Li, Xiaoqing

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