Regulating mechanical properties of laser powder bed fusion manufactured CoCrFeMnNi high-entropy alloy using oversaturated boron doping
The laser powder bed fusion (LPBF) manufactured CoCrFeMnNi high-entropy alloy (HEA) presents potential application at cryogenic temperatures, except for a relatively low yield strength (σy). In this work, we proposed an oversaturated boron-doping strategy to overcome this insufficiency. Compared to...
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Taylor & Francis Group
2025-12-01
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| Series: | Virtual and Physical Prototyping |
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| Online Access: | https://www.tandfonline.com/doi/10.1080/17452759.2025.2470923 |
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| author | Ruize Zhang Haihua Yao Xin Lin Jiahui Gao Zhuofei Guo Jiaxin Gong Yu Zhao Zhen Tan Dingyong He Zheng Zhou |
| author_facet | Ruize Zhang Haihua Yao Xin Lin Jiahui Gao Zhuofei Guo Jiaxin Gong Yu Zhao Zhen Tan Dingyong He Zheng Zhou |
| author_sort | Ruize Zhang |
| collection | DOAJ |
| description | The laser powder bed fusion (LPBF) manufactured CoCrFeMnNi high-entropy alloy (HEA) presents potential application at cryogenic temperatures, except for a relatively low yield strength (σy). In this work, we proposed an oversaturated boron-doping strategy to overcome this insufficiency. Compared to the boron-free and high boron-doping references, the moderate boron-doping LPBF HEA exhibits high strength at temperatures of 77 and 298 K, while maintains favourable ductility, corresponding to a σy of 806 MPa with a total elongation (ϵ) of ∼20% at 298 K, and a σy of 1072 MPa with a ϵ of ∼12% at 77 K, respectively. The improved mechanical properties are attributed to the microstructures composed of refined grains, reduced cell size, oversaturation of boron and the formation of nano-sized Cr2B precipitates at cell boundaries. The grain boundary strengthening, precipitation strengthening, solid solution strengthening and dislocation strengthening contribute to the high σy. The interactions between dislocation slip and deformation twins with boride precipitates account for the enhanced strain hardening and favourable plasticity at 77 K. The results demonstrate an effective strategy to establish balanced mechanical properties of LPBF HEA, and provide an inspiration for future works aiming to develop high-performance structural materials over a wide temperature range. |
| format | Article |
| id | doaj-art-7f270ea0874147afad61a4414f0c086d |
| institution | DOAJ |
| issn | 1745-2759 1745-2767 |
| language | English |
| publishDate | 2025-12-01 |
| publisher | Taylor & Francis Group |
| record_format | Article |
| series | Virtual and Physical Prototyping |
| spelling | doaj-art-7f270ea0874147afad61a4414f0c086d2025-08-20T03:12:11ZengTaylor & Francis GroupVirtual and Physical Prototyping1745-27591745-27672025-12-0120110.1080/17452759.2025.2470923Regulating mechanical properties of laser powder bed fusion manufactured CoCrFeMnNi high-entropy alloy using oversaturated boron dopingRuize Zhang0Haihua Yao1Xin Lin2Jiahui Gao3Zhuofei Guo4Jiaxin Gong5Yu Zhao6Zhen Tan7Dingyong He8Zheng Zhou9College of Materials Science and Engineering, Beijing University of Technology, Beijing, People’s Republic of ChinaSchool of Physics and Optoelectronic Engineering, Beijing University of Technology, Beijing, People’s Republic of ChinaState Key Laboratory of High Temperature Gas Dynamics, Institute of Mechanics, Chinese Academy of Sciences, Beijing, People’s Republic of ChinaCollege of Materials Science and Engineering, Beijing University of Technology, Beijing, People’s Republic of ChinaCollege of Materials Science and Engineering, Beijing University of Technology, Beijing, People’s Republic of ChinaSchool of Physics and Optoelectronic Engineering, Beijing University of Technology, Beijing, People’s Republic of ChinaAECC Hunan Aviation Powerplant Research Institute, Zhuzhou, People’s Republic of ChinaCollege of Materials Science and Engineering, Beijing University of Technology, Beijing, People’s Republic of ChinaCollege of Materials Science and Engineering, Beijing University of Technology, Beijing, People’s Republic of ChinaCollege of Materials Science and Engineering, Beijing University of Technology, Beijing, People’s Republic of ChinaThe laser powder bed fusion (LPBF) manufactured CoCrFeMnNi high-entropy alloy (HEA) presents potential application at cryogenic temperatures, except for a relatively low yield strength (σy). In this work, we proposed an oversaturated boron-doping strategy to overcome this insufficiency. Compared to the boron-free and high boron-doping references, the moderate boron-doping LPBF HEA exhibits high strength at temperatures of 77 and 298 K, while maintains favourable ductility, corresponding to a σy of 806 MPa with a total elongation (ϵ) of ∼20% at 298 K, and a σy of 1072 MPa with a ϵ of ∼12% at 77 K, respectively. The improved mechanical properties are attributed to the microstructures composed of refined grains, reduced cell size, oversaturation of boron and the formation of nano-sized Cr2B precipitates at cell boundaries. The grain boundary strengthening, precipitation strengthening, solid solution strengthening and dislocation strengthening contribute to the high σy. The interactions between dislocation slip and deformation twins with boride precipitates account for the enhanced strain hardening and favourable plasticity at 77 K. The results demonstrate an effective strategy to establish balanced mechanical properties of LPBF HEA, and provide an inspiration for future works aiming to develop high-performance structural materials over a wide temperature range.https://www.tandfonline.com/doi/10.1080/17452759.2025.2470923High-entropy alloysboron dopingmicrostructuretensile behaviourLPBF |
| spellingShingle | Ruize Zhang Haihua Yao Xin Lin Jiahui Gao Zhuofei Guo Jiaxin Gong Yu Zhao Zhen Tan Dingyong He Zheng Zhou Regulating mechanical properties of laser powder bed fusion manufactured CoCrFeMnNi high-entropy alloy using oversaturated boron doping Virtual and Physical Prototyping High-entropy alloys boron doping microstructure tensile behaviour LPBF |
| title | Regulating mechanical properties of laser powder bed fusion manufactured CoCrFeMnNi high-entropy alloy using oversaturated boron doping |
| title_full | Regulating mechanical properties of laser powder bed fusion manufactured CoCrFeMnNi high-entropy alloy using oversaturated boron doping |
| title_fullStr | Regulating mechanical properties of laser powder bed fusion manufactured CoCrFeMnNi high-entropy alloy using oversaturated boron doping |
| title_full_unstemmed | Regulating mechanical properties of laser powder bed fusion manufactured CoCrFeMnNi high-entropy alloy using oversaturated boron doping |
| title_short | Regulating mechanical properties of laser powder bed fusion manufactured CoCrFeMnNi high-entropy alloy using oversaturated boron doping |
| title_sort | regulating mechanical properties of laser powder bed fusion manufactured cocrfemnni high entropy alloy using oversaturated boron doping |
| topic | High-entropy alloys boron doping microstructure tensile behaviour LPBF |
| url | https://www.tandfonline.com/doi/10.1080/17452759.2025.2470923 |
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