Ultrahigh-strength and ductile CoCrFeNi-based high-entropy alloys manufactured by laser powder bed fusion with multiple strengthening mechanisms
|Corresponding Author||Yu，Suzhu; Wang，Shuai; Bai，Jiaming; Wei，Jun|
Laser powder bed fusion (L-PBF) has been proposed as a potential manufacturing process of high-entropy alloys involving rapid cooling rate and compositional element tuning. It, to some extent, compensates for the lack of strength of face-centered cubic (FCC) CoCrFeNi alloy by introducing high-density dislocations and generating hierarchical structures. In this study, the CoCrFeNi-based alloy was manufactured by L-PBF with the minor addition of BC micro-particles and their properties and microstructure were evaluated. Nano-sized precipitates consisting of the boride and varying carbides were found in the form of a core-shell structure. An in-site transformation of carbides appeared around the core of the precipitate due to a large temperature gradient in the melt pool during manufacturing. The tensile yield and ultimate strength of CoCrFeNi–BC alloy (1249.5 MPa and 1421.0 MPa) are double that of CoCrFeNi matrix (624.5 MPa and 691.1 MPa) at room temperature with competitive ductility. The exceptional mechanical properties can be mainly ascribed to precipitate hardening, dislocation hardening and grain refinement, as well as the particle-dislocation interaction.
National Natural Science Foundation of China;
|WOS Research Area|
Materials Science ; Metallurgy & Metallurgical Engineering
Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
|WOS Accession No|
Cited Times [WOS]:0
|Document Type||Journal Article|
|Department||Department of Mechanical and Energy Engineering|
1.School of Materials Science and Engineering,Harbin Institute of Technology (Shenzhen),Shenzhen,518055,China
2.Department of Mechanical and Energy Engineering,Southern University of Science and Technology,Shenzhen,1088 Xueyuan Avenue,518055,China
|Corresponding Author Affilication||Department of Mechanical and Energy Engineering|
Wu，Zhining,He，Minglin,Cao，Hailin,et al. Ultrahigh-strength and ductile CoCrFeNi-based high-entropy alloys manufactured by laser powder bed fusion with multiple strengthening mechanisms[J]. Journal of Materials Research and Technology,2023,25:2948-2960.
Wu，Zhining.,He，Minglin.,Cao，Hailin.,Wang，Shanshan.,Chen，Ruiguang.,...&Wei，Jun.(2023).Ultrahigh-strength and ductile CoCrFeNi-based high-entropy alloys manufactured by laser powder bed fusion with multiple strengthening mechanisms.Journal of Materials Research and Technology,25,2948-2960.
Wu，Zhining,et al."Ultrahigh-strength and ductile CoCrFeNi-based high-entropy alloys manufactured by laser powder bed fusion with multiple strengthening mechanisms".Journal of Materials Research and Technology 25(2023):2948-2960.
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