| Dynamic responses in shocked Cu-Zr nanoglasses with gradient microstructure | |
Guan YL1; Song WD1; Wang YJ(王云江)2 ; Liu SS1; Yu YJ1
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| Corresponding Author | Song, Weidong([email protected]) |
| Source Publication | INTERNATIONAL JOURNAL OF PLASTICITY
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| 2022-02-01 | |
| Volume | 149Pages:23 |
| ISSN | 0749-6419 |
| Abstract | 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. |
| Keyword | Nanoglasses Gradient microstructure Shock response Spallation Molecular dynamics |
| DOI | 10.1016/j.ijplas.2021.103154 |
| Indexed By | SCI ; EI |
| Language | 英语 |
| WOS ID | WOS:000788358900004 |
| WOS Keyword | BULK METALLIC GLASSES ; ATOMIC-STRUCTURE ; SHEAR BANDS ; MECHANICAL-PROPERTIES ; DEFORMATION ; TEMPERATURE ; DEPENDENCE ; INTERFACES ; STABILITY ; FLOW |
| WOS Research Area | Engineering ; Materials Science ; Mechanics |
| WOS Subject | Engineering, Mechanical ; Materials Science, Multidisciplinary ; Mechanics |
| Funding Project | 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] |
| Funding Organization | National Natural Science Foundation of China |
| Classification | 一类 |
| Ranking | 3 |
| Contributor | Song, Weidong |
| Citation statistics | |
| Document Type | 期刊论文 |
| Identifier | http://dspace.imech.ac.cn/handle/311007/89100 |
| Collection | 非线性力学国家重点实验室 |
| Affiliation | 1.Beijing Inst Technol, State Key Lab Explos Sci & Technol, Beijing 100081, Peoples R China; 2.Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech, Beijing 100190, Peoples R China |
| Recommended Citation GB/T 7714 | Guan YL,Song WD,Wang YJ,et al. Dynamic responses in shocked Cu-Zr nanoglasses with gradient microstructure[J]. INTERNATIONAL JOURNAL OF PLASTICITY,2022,149:23.Rp_Au:Song, Weidong |
| APA | Guan YL,Song WD,王云江,Liu SS,&Yu YJ.(2022).Dynamic responses in shocked Cu-Zr nanoglasses with gradient microstructure.INTERNATIONAL JOURNAL OF PLASTICITY,149,23. |
| MLA | Guan YL,et al."Dynamic responses in shocked Cu-Zr nanoglasses with gradient microstructure".INTERNATIONAL JOURNAL OF PLASTICITY 149(2022):23. |
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| Jp2022FA532.pdf（17727KB） | 期刊论文 | 出版稿 | 开放获取 | CC BY-NC-SA | View Download | |
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