首页|Fe-based high-entropy alloy with excellent mechanical properties enabled by nanosized precipitates and heterogeneous grain distribution
Fe-based high-entropy alloy with excellent mechanical properties enabled by nanosized precipitates and heterogeneous grain distribution
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High-entropy alloys(HEAs)consisting of CoCrFeNiAITi systems,with a face-centered cubic(FCC)matrix reinforced by ordered L12 precipitates,have demonstrated exceptional strength-ductility combinations.However,the current compositional design of HEAs heavily relies on high Ni and Co contents,compro-mising the balance between properties and cost.Thus,it is crucial to optimize the cost-performance trade-off by fine-tuning the range of Fe,Co,and Ni,while maintaining excellent strength-ductility com-bination.In this study,we propose a novel Fe-based HEA with nanosized precipitates and a heteroge-neous grain distribution,achieving a strength-ductility combination comparable to state-of-the-art Ni-or Co-based HEAs.The alloy benefits from both precipitation hardening and hetero-deformation-induced strengthening attributed to the heterogeneous grain distribution,resulting in excellent yield strength of 1433 MPa,tensile strength of 1599 MPa,and ductility of 22％.The microstructural evolution and its in-fluence on mechanical properties are unraveled with respect to the observation of precipitate-dislocation interaction and hetero-deformation-induced stress(HDI stress)evaluation.This study suggests that the challenge of balancing properties and cost can be addressed through optimized compositional and mi-crostructural design.
Heechan Jung、Sangwon Lee、Taehyeok Kang、Alireza Zargaran、Pyuck-Pa Choi、Seok Su Sohn
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Department of Materials Science and Engineering,Korea University,Seoul 02841,Republic of Korea
Department of Materials Science and Engineering,Korea Advanced Institute of Science and Technology,Daejeon 34141,Republic of Korea
Graduate Institute of Ferrous and Energy Materials Technology,Pohang University of Science and Technology,Pohang 37673,Republic of Korea
National Research Foundation of Korea(NRF)grant funded by the Korea government MSITNational Research Foundation of Korea(NRF)grant funded by the Korea government MSIT
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