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Development of strong and ductile metastable face-centered cubic single-phase high-entropy alloys
Tohoku Univ, Inst Mat Res, 2-1-1 Katahira, Sendai, Miyagi 9808577, Japan..
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering.
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering.ORCID iD: 0000-0001-9317-6205
Tohoku Univ, Inst Mat Res, 2-1-1 Katahira, Sendai, Miyagi 9808577, Japan..ORCID iD: 0000-0002-8912-3896
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2019 (English)In: Acta Materialia, ISSN 1359-6454, E-ISSN 1873-2453, Vol. 181, p. 318-330Article in journal (Refereed) Published
Abstract [en]

Face-centered cubic (fcc)-phase high-entropy alloys (HEAs) have attracted much academic interest, with the stacking fault energy (SFE) playing an important role in regulating their mechanical behaviors. Here, we revealed the principles for regulating both the elastic and plastic behaviors by composition modification and Mo addition in an fcc-phase quaternary CoCrFeNi system with the assistance of ab initio and thermodynamics calculations. An increase in Co content and a decrease in Fe and Ni contents reduced the fcc phase stability and SFE, but enhanced the elastic modulus, anisotropy, and lattice friction stress. A minor substitution of Co by Mo increased the lattice constant, but decreased the SFE and elastic modulus. Based on these findings, we developed a series of strong and ductile metastable fcc-phase CoxCr25(FeNi)(70-x)Mo-5 (x = 30, 40, 50) HEAs with mechanical properties superior to those of the CoCrFeNi HEM. The careful investigation revealed that the enhanced mechanical properties are due to the Mo-addition-induced strengthening accompanied with a low-SFE-induced restriction of planar behavior of dislocations, mechanical twinning, and strain-induced martensitic transformation. The findings shed light on the development of high-performance HEAs.

Place, publisher, year, edition, pages
PERGAMON-ELSEVIER SCIENCE LTD , 2019. Vol. 181, p. 318-330
Keywords [en]
High-entropy alloy, Metastable, Stacking fault energy, Twinning, Martensitic transformation
National Category
Materials Engineering
Identifiers
URN: urn:nbn:se:kth:diva-265969DOI: 10.1016/j.actamat.2019.09.050ISI: 000498749300027Scopus ID: 2-s2.0-85073213937OAI: oai:DiVA.org:kth-265969DiVA, id: diva2:1381176
Note

QC 20191220

Available from: 2019-12-20 Created: 2019-12-20 Last updated: 2020-01-13Bibliographically approved

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Li, XiaoqingSchönecker, Stephan

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