Dynamic responses in shocked Cu-Zr nanoglasses with gradient microstructure

doi:10.1016/j.ijplas.2021.103154

IMECH-IR > 非线性力学国家重点实验室

	Dynamic responses in shocked Cu-Zr nanoglasses with gradient microstructure
	Guan YL 1; Song WD 1; Wang YJ(王云江)2 ; Liu SS 1; Yu YJ 1
通讯作者	Song, Weidong([email protected])
发表期刊	INTERNATIONAL JOURNAL OF PLASTICITY
	2022-02-01
卷号	149 页码:23
ISSN	0749-6419
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.
关键词	Nanoglasses Gradient microstructure Shock response Spallation Molecular dynamics
DOI	10.1016/j.ijplas.2021.103154
收录类别	SCI ; EI
语种	英语
WOS记录号	WOS:000788358900004
关键词[WOS]	BULK METALLIC GLASSES ; ATOMIC-STRUCTURE ; SHEAR BANDS ; MECHANICAL-PROPERTIES ; DEFORMATION ; TEMPERATURE ; DEPENDENCE ; INTERFACES ; STABILITY ; FLOW
WOS研究方向	Engineering ; Materials Science ; Mechanics
WOS类目	Engineering, Mechanical ; Materials Science, Multidisciplinary ; Mechanics
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]
项目资助者	National Natural Science Foundation of China
论文分区	一类
力学所作者排名	3
RpAuthor	Song, Weidong
引用统计	被引频次：18[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/311007/89100
专题	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.Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech, Beijing 100190, Peoples R China
推荐引用方式 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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