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Atomic-level mechanism of spallation microvoid nucleation in medium entropy alloys under shock loading

文献类型：期刊论文

作者Xie ZC(谢周璨)2,3; Chen Y(陈艳)2,3; Wang HY(汪海英)2,3; Dai LH(戴兰宏)1,2,3
刊名SCIENCE CHINA-TECHNOLOGICAL SCIENCES
出版日期2021-06-15
页码11
ISSN号1674-7321
关键词high medium entropy alloys spallation microvoid nucleation chemical order
DOI10.1007/s11431-021-1814-y
通讯作者Chen Yan(chenyan@lnm.imech.ac.cn) ; Dai LanHong(lhdai@lnm.imech.ac.cn)
英文摘要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.
分类号二类
WOS关键词CAVITATION INSTABILITIES ; VOID NUCLEATION ; SHEAR-BAND ; FRACTURE ; FAILURE ; MICROSTRUCTURE ; RESISTANCE ; GROWTH ; IMPACT ; ORDER
资助项目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]
WOS研究方向Engineering ; Materials Science
语种英语
WOS记录号WOS:000663267800002
资助机构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
其他责任者Chen Yan ; Dai LanHong
源URL[http://dspace.imech.ac.cn/handle/311007/86955]  
专题力学研究所_非线性力学国家重点实验室
作者单位1.Beijing Inst Technol, State Key Lab Explos Sci & Technol, Beijing 100081, Peoples R China
2.Univ Chinese Acad Sci, Sch Engn Sci, Beijing 101408, Peoples R China;
3.Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech, Beijing 100190, Peoples R China;
推荐引用方式
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.
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.

入库方式： OAI收割

来源：力学研究所

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