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Tailoring size and fraction of coherent L12 nanoprecipitates to achieve strong hardening in medium entropy alloys with heterogeneous grain structures

文献类型：期刊论文

作者Qin, Guohao1,2; Zhang, Zihan1,2; Wang, Wei2; Wu, Xiaolei1,2; Yuan, Fuping1,2; Wu XL(武晓雷); Yuan FP(袁福平); Wang W(王为); Zhang ZH(张子晗)
刊名JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
出版日期2024-09-01
卷号32页码:2963-2971
关键词Medium entropy alloy Heterogeneous structure Nanoprecipitates Strain hardening Ductility Precipitation hardening
ISSN号2238-7854
DOI10.1016/j.jmrt.2024.08.106
通讯作者Zhang, Zihan(zhangzihan@imech.ac.cn) ; Yuan, Fuping(fpyuan@lnm.imech.ac.cn)
英文摘要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.
WOS关键词MECHANICAL-PROPERTIES ; PRECIPITATION ; DEFORMATION ; STRENGTH ; IMPACT
资助项目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]
WOS研究方向Materials Science ; Metallurgy & Metallurgical Engineering
语种英语
WOS记录号WOS:001302765300001
资助机构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
源URL[http://dspace.imech.ac.cn/handle/311007/96484]  
专题力学研究所_非线性力学国家重点实验室
通讯作者Zhang, Zihan; Yuan, Fuping
作者单位1.Univ Chinese Acad Sci, Sch Engn Sci, 19A Yuquan Rd, Beijing 100049, Peoples R China
2.Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech, 15 Beisihuan West Rd, Beijing 100190, Peoples R China
推荐引用方式
GB/T 7714		 Qin, Guohao,Zhang, Zihan,Wang, Wei,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.
APA Qin, Guohao.,Zhang, Zihan.,Wang, Wei.,Wu, Xiaolei.,Yuan, Fuping.,...&张子晗.(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 Qin, Guohao,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.

入库方式： OAI收割

来源：力学研究所

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