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Overcoming the strength-ductility trade-off via the formation of nanoscale Cr-rich precipitates in an ultrafine-grained FCC CrFeNi medium entropy alloy matrix
Liang, Dingshan1,2; Zhao, Cancan1; Zhu, Weiwei1,3; Wei, Pengbo1,2; Jiang, Feilong1; Zhang, Yiwen1; Sun, Qingping2; Ren, Fuzeng1
2019-08-05
Source PublicationMaterials Science and Engineering A
ISSN0921-5093
Volume762
AbstractFCC high- and medium-entropy alloys (HEAs and MEAs) have demonstrated high ductility and fracture toughness, but suffer from low strength. To overcome such strength-ductility trade-off, here, we present a strategy via the formation of a high density of nanoscale precipitates in an ultrafine-grained (UFG) FCC matrix. To realize this concept, we selected a cost-effective equiatomic CrFeNi MEA as our model system. The equimolar elemental powder mixture was first forced into the formation of a nanostructured supersaturated FCC solid solution, followed by densification via spark plasma sintering (SPS). During SPS, a high density of nanoscale Cr-rich precipitates were formed in the UFG FCC matrix (821 nm). Such a particular microstructure enabled the alloy to overcome the strength-ductility trade-off, with a high tensile strength of 826 MPa and elongation of 26%. Grain boundary strengthening and precipitation strengthening were found to be the main strengthening mechanisms. These results provide deep insight into the design of novel multi-principal element alloys with high strength and ductility for structural applications.
KeywordMedium entropy alloy Microstructure Strength Ultrafine-grained
DOI10.1016/j.msea.2019.138107
URLView the original
Language英語English
Scopus ID2-s2.0-85068524557
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Cited Times [WOS]:20   [WOS Record]     [Related Records in WOS]
Document TypeJournal article
CollectionUniversity of Macau
Affiliation1.Department of Materials Science and Engineering, Southern University of Science and Technology, Shenzhen, China
2.Department of Mechanical and Aerospace Engineering, The Hong Kong University of Science and Technology, Kowloon, Clear Water Bay, Hong Kong
3.Institute of Applied Physics and Materials Engineering, Faculty of Science & Technology, University of Macau, China
Recommended Citation
GB/T 7714
Liang, Dingshan,Zhao, Cancan,Zhu, Weiwei,et al. Overcoming the strength-ductility trade-off via the formation of nanoscale Cr-rich precipitates in an ultrafine-grained FCC CrFeNi medium entropy alloy matrix[J]. Materials Science and Engineering A,2019,762.
APA Liang, Dingshan,Zhao, Cancan,Zhu, Weiwei,Wei, Pengbo,Jiang, Feilong,Zhang, Yiwen,Sun, Qingping,&Ren, Fuzeng.(2019).Overcoming the strength-ductility trade-off via the formation of nanoscale Cr-rich precipitates in an ultrafine-grained FCC CrFeNi medium entropy alloy matrix.Materials Science and Engineering A,762.
MLA Liang, Dingshan,et al."Overcoming the strength-ductility trade-off via the formation of nanoscale Cr-rich precipitates in an ultrafine-grained FCC CrFeNi medium entropy alloy matrix".Materials Science and Engineering A 762(2019).
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