| Atomic-level mechanism of spallation microvoid nucleation in medium entropy alloys under shock loading | |
Xie ZC(谢周璨)1,2; Chen Y(陈艳)1,2; Wang HY(汪海英)1,2; Dai LH(戴兰宏)1,2,3
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| Corresponding Author | Chen Yan([email protected]) ; Dai LanHong([email protected]) |
| Source Publication | SCIENCE CHINA-TECHNOLOGICAL SCIENCES
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| 2021-06-15 | |
| Pages | 11 |
| ISSN | 1674-7321 |
| Abstract | Spallation, rupture under impulsive tensile loading, is a dynamic failure process involving the collective evolution and accumulation of enormous microdamage in solids. In contrast to traditional alloys, the spallation mechanism in medium entropy alloys, the recently emerged multiprinciple and chemically disordered alloys, is poorly understood. Here we conduct molecular dynamics simulations and first principle calculations to investigate the effects of impact velocities and the local chemical order on spallation microvoid nucleation in a CrCoNi medium entropy alloy under shock wave loading. As the impact velocity increases, the microvoid nucleation site exhibits a transition from the grain boundaries to the grains to release redundant imposed energy. During the intragranular nucleation process, microvoids nucleate in the poor-Cr region with a large local nonaffine deformation, which is attributed to the weak metallic bonds in this position with sparse free electrons. For intergranular nucleation, a Franke-like dislocation source forms through the dislocation reaction, leading to enormous dislocations piling up in a narrow twin stripe, which markedly increases the local stored energy and promotes microvoid nucleation. These results shed light on the mechanism of spallation in chemically complexed medium entropy alloys. |
| Keyword | high medium entropy alloys spallation microvoid nucleation chemical order |
| DOI | 10.1007/s11431-021-1814-y |
| Indexed By | SCI ; EI ; CSCD |
| Language | 英语 |
| WOS ID | WOS:000663267800002 |
| WOS Keyword | CAVITATION INSTABILITIES ; VOID NUCLEATION ; SHEAR-BAND ; FRACTURE ; FAILURE ; MICROSTRUCTURE ; RESISTANCE ; GROWTH ; IMPACT ; ORDER |
| WOS Research Area | Engineering ; Materials Science |
| WOS Subject | Engineering, Multidisciplinary ; Materials Science, Multidisciplinary |
| Funding Project | National Key Research and Development Program of China[2017YFB0702003] ; National Natural Science Foundation of China (NSFC)[11790292] ; National Natural Science Foundation of China (NSFC)[11972346] ; National Natural Science Foundation of China (NSFC)[11672316] ; NSFC Basic Science Center Program for Multiscale Problems in Nonlinear Mechanics[11988102] ; Strategic Priority Research Program of the Chinese Academy of Sciences[XDB22040302] ; Strategic Priority Research Program of the Chinese Academy of Sciences[XDB22040303] ; Key Research Program of Frontier Sciences of the Chinese Academy of Sciences[QYZDJSSWJSC011] ; Science Challenge Project[TZ2018001] |
| Funding Organization | National Key Research and Development Program of China ; National Natural Science Foundation of China (NSFC) ; NSFC Basic Science Center Program for Multiscale Problems in Nonlinear Mechanics ; Strategic Priority Research Program of the Chinese Academy of Sciences ; Key Research Program of Frontier Sciences of the Chinese Academy of Sciences ; Science Challenge Project |
| Classification | 二类 |
| Ranking | 1 |
| Contributor | Chen Yan ; Dai LanHong |
| Citation statistics | |
| Document Type | 期刊论文 |
| Identifier | http://dspace.imech.ac.cn/handle/311007/86956 |
| 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, Beijing 100190, Peoples R China; 2.Univ Chinese Acad Sci, Sch Engn Sci, Beijing 101408, Peoples R China; 3.Beijing Inst Technol, State Key Lab Explos Sci & Technol, Beijing 100081, Peoples R China |
| Recommended Citation GB/T 7714 | Xie ZC,Chen Y,Wang HY,et al. Atomic-level mechanism of spallation microvoid nucleation in medium entropy alloys under shock loading[J]. SCIENCE CHINA-TECHNOLOGICAL SCIENCES,2021:11.Rp_Au:Chen Yan, Dai LanHong |
| APA | 谢周璨,陈艳,汪海英,&戴兰宏.(2021).Atomic-level mechanism of spallation microvoid nucleation in medium entropy alloys under shock loading.SCIENCE CHINA-TECHNOLOGICAL SCIENCES,11. |
| MLA | 谢周璨,et al."Atomic-level mechanism of spallation microvoid nucleation in medium entropy alloys under shock loading".SCIENCE CHINA-TECHNOLOGICAL SCIENCES (2021):11. |
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| Jp2021F277.pdf（11503KB） | 期刊论文 | 出版稿 | 开放获取 | CC BY-NC-SA | View Download | |
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