Shear banding stability and fracture of metallic glass: Effect of external confinement

doi:10.1016/j.jmps.2020.103922

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	Shear banding stability and fracture of metallic glass: Effect of external confinement
	Qu, R. T.1,2,3; Wu, S. J.2,3; Wang, S. G.4; Wang, X. D.2; Zhang, Z. F.1,2,3
刊名	JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS
	2020-05-01
卷号	138 页码:17
关键词	Shear band Confinement Fracture Plasticity Metallic glass
ISSN号	0022-5096
DOI	10.1016/j.jmps.2020.103922
通讯作者	Qu, R. T.(rtqu@imr.ac.cn) ; Zhang, Z. F.(zhfzhang@imr.ac.cn)
英文摘要	While metallic glasses (MGs) usually fracture catastrophically under uniaxial loading, external confinement like coating has been proved quite effective for improving the plasticity. The positive effect of confinement was mainly attributed to the lateral confining stress on the interface between sample and confinement, which impedes the excess propagation of shear bands and promotes their multiplication. Here we show that, even though there is no contact between the MG and the confinement, the brittle fracture can be effectively suppressed. Three dimensional (3D) high resolution X-ray tomography observations successfully captured the shear-band cracking evolution and confirmed that the external confinement caused the change of shear-band fracture mode. Analysis on the thermodynamics and kinetics of shear banding in the confined MG shows that the confinement extremely reduces the shear velocity, contributes to the shear band arrest, and largely lowers the energy release rate, leading to the increase of the shear stability and the resistance to instant fracture. Finally, the mechanisms of confinement effect on the plastic deformation in various confined MG systems were summarized. These results suggest new understandings on the effect of confinement for the fracture of MG composites or coated MG structures, and on the mechanisms of shear-band cracking and fracture in different MG loading systems. (C) 2020 Elsevier Ltd. All rights reserved.
资助项目	National Natural Science Foundation of China (NSFC)[51771205] ; LiaoNing Revitalization Talents Program[XLYC1808027]
WOS研究方向	Materials Science ; Mechanics ; Physics
语种	英语
出版者	PERGAMON-ELSEVIER SCIENCE LTD
WOS记录号	WOS:000525896300020
资助机构	National Natural Science Foundation of China (NSFC) ; LiaoNing Revitalization Talents Program
内容类型	期刊论文
源URL	[http://ir.imr.ac.cn/handle/321006/138382]
专题	金属研究所_中国科学院金属研究所
通讯作者	Qu, R. T.; Zhang, Z. F.
作者单位	1.Jihua Lab, Foshan 528200, Peoples R China 2.Chinese Acad Sci, Inst Met Res, Lab Fatigue & Fracture Mat, Shenyang 110016, Peoples R China 3.Univ Sci & Technol China, Sch Mat Sci & Engn, Hefei 230026, Peoples R China 4.Chinese Acad Sci, Inst Met Res, Shenyang Natl Lab Mat Sci, Shenyang 110016, Peoples R China
推荐引用方式 GB/T 7714	Qu, R. T.,Wu, S. J.,Wang, S. G.,et al. Shear banding stability and fracture of metallic glass: Effect of external confinement[J]. JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS,2020,138:17.
APA	Qu, R. T.,Wu, S. J.,Wang, S. G.,Wang, X. D.,&Zhang, Z. F..(2020).Shear banding stability and fracture of metallic glass: Effect of external confinement.JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS,138,17.
MLA	Qu, R. T.,et al."Shear banding stability and fracture of metallic glass: Effect of external confinement".JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS 138(2020):17.