Dynamic responses in shocked Cu-Zr nanoglasses with gradient microstructure
文献类型：期刊论文
| 作者 | Guan, Yunlong2; Song, Weidong2; Wang, Yunjiang1 ; Liu, Shanshan2; Yu, Yongji2; Wang YJ(王云江)
|
| 刊名 | INTERNATIONAL JOURNAL OF PLASTICITY
 |
| 出版日期 | 2022-02-01 |
| 卷号 | 149页码:23 |
| ISSN号 | 0749-6419 |
| 关键词 | Nanoglasses Gradient microstructure Shock response Spallation Molecular dynamics |
| DOI | 10.1016/j.ijplas.2021.103154 |
| 通讯作者 | Song, Weidong(swdgh@bit.edu.cn) |
| 英文摘要 | Shock is one of the physical processes that materials are most likely to suffer during applications, therefore the elusive shock properties of nanoglasses are unacceptable. Additionally, establishing gradient microstructure is a promising approach to optimize mechanics properties further. Here, shock characteristics of Cu64Zr36 nanoglasses with gradient microstructures are systematically investigated by molecular dynamics simulations in the particle velocity range of 0.5 to 5 km/s. Two types of gradient nanoglasses (GNGs) along the shock direction are prepared and analyzed, i. e., a negative gradient structure (S1) in contrast with a positive gradient structure (S2). The results show that the number of mechanically stable < 0,0,12,0 > and < 0,1,10,2 > atomic Voronoi polyhedra, which are typical building blocks of the amorphous structure in terms of Voronoi tessellation method, in grain interfaces is significantly less than that in grain interiors. As a result, the local free volume gradually changes along the shock direction by the designed gradient structure, which causes a significant impact on the shock wave profiles of shear strain, stress, configurational entropy, and temperature in the GNGs. However, due to a similar chemically disordered feature in grain interiors and interfaces, the shock wave speeds of nanoglasses are not sensitive to grain sizes under the same shock strength, contrary to the usual shock wave speed mechanism in conventional polycrystalline. Thus, unlike traditional polycrystalline with grain size gradient, the indirect free-surface method of estimating spall strength is still applicable to the GNGs. Finally, the positive gradient structure results in lower temperature and free volume in the spall region, which causes the spall strengths of the S2 sample higher than those of the S1 sample. |
| WOS关键词 | BULK METALLIC GLASSES ; ATOMIC-STRUCTURE ; SHEAR BANDS ; MECHANICAL-PROPERTIES ; DEFORMATION ; TEMPERATURE ; DEPENDENCE ; INTERFACES ; STABILITY ; FLOW |
| 资助项目 | National Natural Science Foundation of China[12172056] ; National Natural Science Foundation of China[11972092] ; National Natural Science Foundation of China[12002049] ; National Natural Science Foundation of China[11802028] ; National Natural Science Foundation of China[11732003] |
| WOS研究方向 | Engineering ; Materials Science ; Mechanics |
| 语种 | 英语 |
| WOS记录号 | WOS:000788358900004 |
| 资助机构 | National Natural Science Foundation of China |
| 源URL | [http://dspace.imech.ac.cn/handle/311007/89099]  |
| 专题 | 力学研究所_非线性力学国家重点实验室 |
| 通讯作者 | Song, Weidong |
| 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 & Technol, Beijing 100081, Peoples R China |
| 推荐引用方式 GB/T 7714 | Guan, Yunlong,Song, Weidong,Wang, Yunjiang,et al. Dynamic responses in shocked Cu-Zr nanoglasses with gradient microstructure[J]. INTERNATIONAL JOURNAL OF PLASTICITY,2022,149:23. |
| APA | Guan, Yunlong,Song, Weidong,Wang, Yunjiang,Liu, Shanshan,Yu, Yongji,&王云江.(2022).Dynamic responses in shocked Cu-Zr nanoglasses with gradient microstructure.INTERNATIONAL JOURNAL OF PLASTICITY,149,23. |
| MLA | Guan, Yunlong,et al."Dynamic responses in shocked Cu-Zr nanoglasses with gradient microstructure".INTERNATIONAL JOURNAL OF PLASTICITY 149(2022):23. |
入库方式： OAI收割
来源：力学研究所
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