Grain size effect and structural heterogeneity in the shock-induced plastic deformation mechanism of nanocrystalline high-entropy alloys
文献类型：期刊论文
| 作者 | Meng, Yuquan2; Song, Weidong2; Liu, Shanshan2; Wang YJ(王云江)1,4; Li, Wanghui3; Xiao, Lijun2 |
| 刊名 | EUROPEAN JOURNAL OF MECHANICS A-SOLIDS
 |
| 出版日期 | 2025-07-01 |
| 卷号 | 112页码:22 |
| 关键词 | Nanocrystalline HEAs Grain size effect Shock response Spallation Molecular dynamics |
| ISSN号 | 0997-7538 |
| DOI | 10.1016/j.euromechsol.2025.105662 |
| 通讯作者 | Song, Weidong(swdgh@bit.edu.cn) ; Xiao, Lijun(bitxlj@bit.edu.cn) |
| 英文摘要 | The grain size distribution greatly influences the macroscopic mechanical and functional characteristics of polycrystalline materials. However, comprehending the distinct characteristics of nanocrystalline metals under dynamic loading poses challenges due to stringent spatio-temporal resolution requirements. In this study, the shock response of nanocrystalline CoCrCuFeNi high-entropy alloys (HEAs) with varied sizes of both homogeneous and heterogeneous grain microstructures are systematically investigated through molecular dynamic simulations. Our findings reveal that the shock front width, Hugoniot elastic limit (HEL), and shock wave velocity all exhibit an increase with larger grain sizes. Under shock loading, the dominant plastic mechanism transitions from grain-boundary-accommodated processes to dislocation-mediated (dislocation, twin, L-C lock, and HCP phase) ones with increasing grain size, resulting in the shear strength increasing with the increase in grain size. In comparison, heterogeneous structures enhance plasticity through a synergistic deformation model, efficiently distributing loads between grains of varying sizes. Additionally, it is found that the smaller grain sample performs a higher spall strength due to its higher fracture surface energy. The damage mechanism transforms from multiple nucleation of voids and individual growth to intergranular damage and void coalescence as the grain sizes increase. An energy balance fragmentation model considering void damage evolution and fracture surface energy is adopted to accurately predict the spall strength of nanocrystalline HEAs. Compared with the traditional metal Ni, HEA performs a higher HEL, spall strength, and twinning tendency due to the low stacking fault energy and pronounced lattice distortion. These atomistic insights contribute to the identification of practical applications for HEAs as structural materials in extreme loading environments. |
| 分类号 | 二类/Q1 |
| WOS关键词 | ULTRAHIGH STRENGTH ; SPALL STRENGTH ; COMPRESSION ; ALUMINUM ; STRAIN ; DAMAGE ; TEMPERATURE ; NICKEL ; MODEL |
| 资助项目 | National Natural Science Foundation of China[12172056] ; National Natural Science Foundation of China[12002049] ; National Natural Science Foundation of China[12372349] ; National Natural Science Foundation of China[12072044] ; Beijing Institute of Technology Research Fund Program for Young Scholars[XSQD-202102005] ; National Key Laboratory of Computational Physics[6142A05230102] |
| WOS研究方向 | Mechanics |
| 语种 | 英语 |
| WOS记录号 | WOS:001466097600001 |
| 资助机构 | National Natural Science Foundation of China ; Beijing Institute of Technology Research Fund Program for Young Scholars ; National Key Laboratory of Computational Physics |
| 其他责任者 | Song, Weidong，Xiao, Lijun |
| 源URL | [http://dspace.imech.ac.cn/handle/311007/101028]  |
| 专题 | 力学研究所_非线性力学国家重点实验室 |
| 作者单位 | 1.Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech, Beijing 100190, Peoples R China; 2.Beijing Inst Technol, State Key Lab Explos Sci & Safety Protect, Beijing 100081, Peoples R China; 3.ASTAR, Inst High Performance Comp IHPC, 1 Fusionopolis Way,16-16 Connexis, Singapore 138632, Singapore 4.Univ Chinese Acad Sci, Sch Engn Sci, Beijing 100049, Peoples R China; |
| 推荐引用方式 GB/T 7714 | Meng, Yuquan,Song, Weidong,Liu, Shanshan,et al. Grain size effect and structural heterogeneity in the shock-induced plastic deformation mechanism of nanocrystalline high-entropy alloys[J]. EUROPEAN JOURNAL OF MECHANICS A-SOLIDS,2025,112:22. |
| APA | Meng, Yuquan,Song, Weidong,Liu, Shanshan,王云江,Li, Wanghui,&Xiao, Lijun.(2025).Grain size effect and structural heterogeneity in the shock-induced plastic deformation mechanism of nanocrystalline high-entropy alloys.EUROPEAN JOURNAL OF MECHANICS A-SOLIDS,112,22. |
| MLA | Meng, Yuquan,et al."Grain size effect and structural heterogeneity in the shock-induced plastic deformation mechanism of nanocrystalline high-entropy alloys".EUROPEAN JOURNAL OF MECHANICS A-SOLIDS 112(2025):22. |
入库方式： OAI收割
来源：力学研究所
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