| Tailoring size and fraction of coherent L12 nanoprecipitates to achieve strong hardening in medium entropy alloys with heterogeneous grain structures | |
Tan GH(覃郭灏)1,2; Zhang ZH(张子晗)1,2 ; Wang W(王为)1; Wu XL(武晓雷)1,2; Yuan FP(袁福平)1,2
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| Corresponding Author | Zhang, Zihan([email protected]) ; Yuan, Fuping([email protected]) |
| Source Publication | JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
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| 2024-09-01 | |
| Volume | 32Pages:2963-2971 |
| ISSN | 2238-7854 |
| Abstract | Heterogeneous grain structures with coherent L12 nanoprecipitates were constructed in a medium entropy alloy with chemical composition of Co34.5Cr32Ni27.5Al3Ti3 (at. %). The volume fraction and size of L12 nanoprecipitates are observed to become higher and larger, and the interspacing is found to become smaller with increasing aging time, resulting in a severer heterogeneity. The domain of tensile properties was expanded by varying the size and volume fraction of coherent L12 nanoprecipitates after aging treatment. The samples after longer-time aging treatment show stronger strain hardening as compared to those after shorter-time aging treatment. The hetero-deformation-induced (HDI) hardening plays a more vital role in the longer-time aged samples than the shorter-time aged samples, especially at the elasto-plastic transition stage. The dominant precipitation hardening mechanism is observed to transit from dislocation-cutting to Orowan dislocation-looping with increasing precipitation size, as predicted by a theoretical model and validated by experimental results. Multiple deformation defects, such as deformation twins, stacking faults and Lomer-Cottrell locks, are the dominant deformation mechanisms for all samples, while interactions between these defects and L12 nanoprecipitates were observed to be more intensive in the longer-time aged samples than in the shorter-time aged samples, resulting in stronger precipitation and HDI hardening. |
| Keyword | Medium entropy alloy Heterogeneous structure Nanoprecipitates Strain hardening Ductility Precipitation hardening |
| DOI | 10.1016/j.jmrt.2024.08.106 |
| Indexed By | SCI ; EI |
| Language | 英语 |
| WOS ID | WOS:001302765300001 |
| WOS Keyword | MECHANICAL-PROPERTIES ; PRECIPITATION ; DEFORMATION ; STRENGTH ; IMPACT |
| WOS Research Area | Materials Science ; Metallurgy & Metallurgical Engineering |
| WOS Subject | Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering |
| Funding Project | National Natural Science Foundation of China[52192591] ; NSFC Basic Science Center Program for Multiscale Problems in Nonlinear Mechanics[11988102] ; Strategic Priority Research Program of the Chinese Academy of Sciences[XDB0510300] ; National Key R&D Program of China[2019YFA0209902] |
| Funding Organization | National Natural Science Foundation of China ; NSFC Basic Science Center Program for Multiscale Problems in Nonlinear Mechanics ; Strategic Priority Research Program of the Chinese Academy of Sciences ; National Key R&D Program of China |
| Classification | 一类 |
| Ranking | 1 |
| Contributor | Zhang, Zihan ; Yuan, Fuping |
| Citation statistics | |
| Document Type | 期刊论文 |
| Identifier | http://dspace.imech.ac.cn/handle/311007/96485 |
| Collection | 非线性力学国家重点实验室 |
| Affiliation | 1.Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech, 15 Beisihuan West Rd, Beijing 100190, Peoples R China; 2.Univ Chinese Acad Sci, Sch Engn Sci, 19A Yuquan Rd, Beijing 100049, Peoples R China |
| Recommended Citation GB/T 7714 | Tan GH,Zhang ZH,Wang W,et al. Tailoring size and fraction of coherent L12 nanoprecipitates to achieve strong hardening in medium entropy alloys with heterogeneous grain structures[J]. JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T,2024,32:2963-2971.Rp_Au:Zhang, Zihan, Yuan, Fuping |
| APA | 覃郭灏,张子晗,王为,武晓雷,&袁福平.(2024).Tailoring size and fraction of coherent L12 nanoprecipitates to achieve strong hardening in medium entropy alloys with heterogeneous grain structures.JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T,32,2963-2971. |
| MLA | 覃郭灏,et al."Tailoring size and fraction of coherent L12 nanoprecipitates to achieve strong hardening in medium entropy alloys with heterogeneous grain structures".JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T 32(2024):2963-2971. |
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