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

10.1016/j.msea.2019.138107

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING   影响因子和分区

0921-5093

1873-4936

FCC 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.

Medium entropy alloy Strength Microstructure Ultrafine-grained

SCI ; EI

英语

第一 ; 通讯

Guangdong Innovative and Entrepreneurial Research Team Program, China[2016ZT06C279]

Science & Technology - Other Topics ; Materials Science ; Metallurgy & Metallurgical Engineering

Nanoscience & Nanotechnology ; Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering

WOS:000479025800035

ELSEVIER SCIENCE SA

20192807166986

Cost effectiveness ; Ductility ; Economic and social effects ; Entropy ; Fracture toughness ; Grain boundaries ; High strength alloys ; Iron alloys ; Isomers ; Metallic matrix composites ; Microstructure ; Nanotechnology ; Spark plasma sintering ; Tensile strength

Metallurgy and Metallography:531 ; Metallurgy:531.1 ; Chromium and Alloys:543.1 ; Iron Alloys:545.2 ; Thermodynamics:641.1 ; Nanotechnology:761 ; Chemical Products Generally:804 ; Industrial Economics:911.2 ; Materials Science:951 ; Social Sciences:971

MATERIALS SCIENCE

Web of Science

1.Southern Univ Sci & Technol, Dept Mat Sci & Engn, Shenzhen, Guangdong, Peoples R China
2.Hong Kong Univ Sci & Technol, Dept Mech & Aerosp Engn, Kowloon, Clear Water Bay, Hong Kong, Peoples R China
3.Univ Macau, Fac Sci & Technol, Inst Appl Phys & Mat Engn, Macau, Peoples R China

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-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING,2019,762.

Liang, Dingshan.,Zhao, Cancan.,Zhu, Weiwei.,Wei, Pengbo.,Jiang, Feilong.,...&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-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING,762.

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-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING 762(2019).