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Novel Co-rich high entropy alloys with superior tensile properties
Tohoku Univ, Inst Mat Res, 2-1-1 Katahira, Sendai, Miyagi 9808577, Japan.;MIT, Dept Mat Sci & Engn, 77 Massachusetts Ave, Cambridge, MA 02139 USA..
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering.
Tohoku Univ, Inst Mat Res, 2-1-1 Katahira, Sendai, Miyagi 9808577, Japan.;Tohoku Univ, Dept Mat Proc, Sendai, Miyagi, Japan..
Tohoku Univ, Inst Mat Res, 2-1-1 Katahira, Sendai, Miyagi 9808577, Japan..
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2019 (English)In: Materials Research Letters, ISSN 2166-3831, Vol. 7, no 2, p. 82-88Article in journal (Refereed) Published
Abstract [en]

We developed a series of Co-rich CoxCr25(FeNi)(75-x) (x = 35, 45, 55, 65) high entropy alloys with improved strength and/or ductility, derived from lowering the stacking fault energy (SFE) and reducing the fcc phase stability of the equiatomic CoCrFeNi alloy. Thermodynamics and ab initio calculations demonstrated that increasing Co while decreasing Fe and Ni concentrations lower the SFE and reduce the fcc phase stability. The Co35Cr25Fe20Ni20 and Co45Cr25Fe15Ni15 alloys with single fcc phase, exhibit superior tensile properties, contributing to the twinning and fcc -> hcp martensitic transformation. The present study offers a guideline for designing high-performance high entropy alloys. [GRAPHICS] IMPACT STATEMENT A series of novel Co-rich non-equiatomic high entropy alloys with enhanced tensile properties were developed by lowering the stacking fault energy and reducing the phase stability of equiatomic CoCrFeNi alloy.

Place, publisher, year, edition, pages
Taylor & Francis, 2019. Vol. 7, no 2, p. 82-88
Keywords [en]
High entropy alloy, metastable, stacking fault energy, martensitic transformation, deformation twinning
National Category
Materials Engineering
Identifiers
URN: urn:nbn:se:kth:diva-271107DOI: 10.1080/21663831.2018.1553803ISI: 000471077200006Scopus ID: 2-s2.0-85061558192OAI: oai:DiVA.org:kth-271107DiVA, id: diva2:1415129
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QC 20200317

Available from: 2020-03-17 Created: 2020-03-17 Last updated: 2020-03-17Bibliographically approved

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Li, Xiaoqing

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