Dynamic responses in shocked Cu-Zr nanoglasses with gradient microstructure

doi:10.1016/j.ijplas.2021.103154

CORC > 力学研究所 > 中国科学院力学研究所 > 非线性力学国家重点实验室

	Dynamic responses in shocked Cu-Zr nanoglasses with gradient microstructure
	Guan, Yunlong 2; Song, Weidong 2; Wang, Yunjiang 1; Liu, Shanshan 2; Yu, Yongji 2
刊名	INTERNATIONAL JOURNAL OF PLASTICITY
	2022-02-01
卷号	149 页码:23
关键词	Nanoglasses Gradient microstructure Shock response Spallation Molecular dynamics
ISSN号	0749-6419
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.
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关键词	BULK METALLIC GLASSES ; ATOMIC-STRUCTURE ; SHEAR BANDS ; MECHANICAL-PROPERTIES ; DEFORMATION ; TEMPERATURE ; DEPENDENCE ; INTERFACES ; STABILITY ; FLOW
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
内容类型	期刊论文
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.(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.