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

doi:10.1007/s11431-021-1814-y

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	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
通讯作者	Chen Yan(chenyan@lnm.imech.ac.cn) ; Dai LanHong(lhdai@lnm.imech.ac.cn)
发表期刊	SCIENCE CHINA-TECHNOLOGICAL SCIENCES
	2021-06-15
页码	11
ISSN	1674-7321
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.
关键词	high medium entropy alloys spallation microvoid nucleation chemical order
DOI	10.1007/s11431-021-1814-y
收录类别	SCI ; EI ; CSCD
语种	英语
WOS记录号	WOS:000663267800002
关键词[WOS]	CAVITATION INSTABILITIES ; VOID NUCLEATION ; SHEAR-BAND ; FRACTURE ; FAILURE ; MICROSTRUCTURE ; RESISTANCE ; GROWTH ; IMPACT ; ORDER
WOS研究方向	Engineering ; Materials Science
WOS类目	Engineering, Multidisciplinary ; Materials Science, Multidisciplinary
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]
项目资助者	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
论文分区	二类
力学所作者排名	1
RpAuthor	Chen Yan ; Dai LanHong
引用统计	被引频次：10[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://dspace.imech.ac.cn/handle/311007/86956
专题	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.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
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.

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