| Unraveling the two-stage precipitation mechanism in a hierarchical-structured fcc/L21 high-entropy alloy: Experiments and analytical modeling | |
| Li, W.; Wang, W.1,2; Niuc, M. C.3,4; Yang, K.1,2; Luane, J. H.2,5; Zhang, H. W.1,2; Jiao, Z. B.3,4 | |
| Corresponding Author | Wang, W.(wangw@imr.ac.cn) ; Zhang, H. W.(hongweizhang@imr.ac.cn) ; Jiao, Z. B.(zb.jiao@polyu.edu.hk) |
| 2024 | |
| Source Publication | ACTA MATERIALIA
 |
| ISSN | 1359-6454 |
| Volume | 262Pages:17 |
| Abstract | Understanding the phase stability and precipitation mechanisms is crucial for engineering multiphase nano structured alloys with optimal mechanical properties. In this work, we studied the formation and temporal evolution of nanoprecipitates and their effect on mechanical properties of an fcc/L21 eutectic high-entropy alloy through a combination of experiments and analytical modeling. Aging the alloy at 1023 K results in the precipitation of coherent L12 nanoparticles in the fcc phase and coherent bcc nanoparticles in the L21 phase, leading to the formation of an fcc/L12 + L21/bcc hierarchical structure. Notably, the scanning transmission electron microscopy (STEM) results reveal that the precipitation in both the fcc and L21 phases is not through a one-step nucleation, but a two-stage transformation consisting of an initial chemical separation via spinodal decomposition and subsequent structural ordering/disordering. The Gibbs free energy diagrams of the fcc and L21 phases were modeled through numerical techniques, and the spinodal decomposition regions of the two systems at different temperatures were calculated. Based on the modeling results, we discussed the phase stability and thermodynamics of spinodal decomposition of the two phases. In addition, the formation of hierarchical structure substantially enhances the strength of the alloy. Modeling of the strengthening mechanisms reveals that the order strengthening of L12 nanoparticles plays a major role in enhancing the yield strength of the alloy, whereas the contribution from the bcc nanoparticles can be negligible. Our findings provide insights into the phase stability, precipitation and strengthening mechanisms of hierarchical-structured alloys. |
| Keyword | High-entropy alloy Precipitation Spinodal decomposition Strengthening mechanism |
| Funding Organization | National Natural Science Foundation of China ; Research Grants Council of Hong Kong ; Shenzhen Science and Technology Program ; Research Institute for Advanced Manufacturing Fund ; PolyU Fund ; Liaoning Key Research and Development Program ; Chinese Academy of Sciences ; IMR Innovation Fund ; National Natural Science Foundation of Liaoning Province |
| DOI | 10.1016/j.actamat.2023.119426 |
| Indexed By | SCI |
| Language | 英语 |
| Funding Project | National Natural Science Foundation of China[52271122] ; National Natural Science Foundation of China[52171162] ; Research Grants Council of Hong Kong[ECS 25202719] ; Research Grants Council of Hong Kong[GRF 15227121] ; Research Grants Council of Hong Kong[C1017-21GF] ; Research Grants Council of Hong Kong[C1020-21GF] ; Shenzhen Science and Technology Program[JCYJ20210324142203009] ; Research Institute for Advanced Manufacturing Fund[P0041364] ; Research Institute for Advanced Manufacturing Fund[P0046108] ; PolyU Fund[P0038814] ; PolyU Fund[P0039624] ; PolyU Fund[P0042933] ; PolyU Fund[P0043467] ; Liaoning Key Research and Development Program[2022JH2/101300080] ; Chinese Academy of Sciences[ZDBS-LY-JSC023] ; IMR Innovation Fund[2023-PY16] ; National Natural Science Foundation of Liaoning Province[2023-BS-012] |
| WOS Research Area | Materials Science ; Metallurgy & Metallurgical Engineering |
| WOS Subject | Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering |
| WOS ID | WOS:001106880100001 |
| Publisher | PERGAMON-ELSEVIER SCIENCE LTD |
| Citation statistics | |
| Document Type | 期刊论文 |
| Identifier | http://ir.imr.ac.cn/handle/321006/177346 |
| Collection | 中国科学院金属研究所 |
| Corresponding Author | Wang, W.; Zhang, H. W.; Jiao, Z. B. |
| Affiliation | 1.Univ Sci & Technol China, Sch Mat Sci & Engn, Shenyang 110016, Peoples R China 2.Chinese Acad Sci, Shi Changxu Innovat Ctr Adv Mat, Inst Met Res, Shenyang 110016, Peoples R China 3.Hong Kong Polytech Univ, Res Inst Adv Mfg, Dept Mech Engn, Hong Kong, Peoples R China 4.Hong Kong Polytech Univ, Shenzhen Res Inst, Shenzhen 518057, Peoples R China 5.City Univ Hong Kong, Dept Mat Sci & Engn, Inter Univ 3D Atom Probe Tomog Unit, Hong Kong, Peoples R China |
| Recommended Citation GB/T 7714 | Li, W.,Wang, W.,Niuc, M. C.,et al. Unraveling the two-stage precipitation mechanism in a hierarchical-structured fcc/L21 high-entropy alloy: Experiments and analytical modeling[J]. ACTA MATERIALIA,2024,262:17. |
| APA | Li, W..,Wang, W..,Niuc, M. C..,Yang, K..,Luane, J. H..,...&Jiao, Z. B..(2024).Unraveling the two-stage precipitation mechanism in a hierarchical-structured fcc/L21 high-entropy alloy: Experiments and analytical modeling.ACTA MATERIALIA,262,17. |
| MLA | Li, W.,et al."Unraveling the two-stage precipitation mechanism in a hierarchical-structured fcc/L21 high-entropy alloy: Experiments and analytical modeling".ACTA MATERIALIA 262(2024):17. |
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