Shear-band toughness of bulk metallic glasses

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	Shear-band toughness of bulk metallic glasses
	Jiang MQ(蒋敏强); Dai LH(戴兰宏)
刊名	ACTA MATERIALIA
	2011
通讯作者邮箱	mqjiang@imech.ac.cn; lhdai@lnm.imech.ac.cn
卷号	59 期号:11 页码:4525-4537
关键词	Bulk Metallic Glass Shear Band Free Volume Energy Dissipation Toughness Amorphous-Alloys Microstructural Evolution Inhomogeneous Deformation Dynamic Deformation Fracture-Toughness Room-Temperature Forming Liquids Behavior Flow Propagation
ISSN号	1359-6454
通讯作者	Dai, LH (reprint author), Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech, Beijing 100190, Peoples R China
产权排序	[Jiang, MQ; Dai, LH] Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech, Beijing 100190, Peoples R China
中文摘要	Dynamic "forced" shear and quasi-static tensile tests were performed on a typical Vitreloy 1 bulk metallic glass (BMG). The nanoscale shear band is found to initiate in a local plastic region, then propagates with a well-defined front. A theoretical model that takes into account momentum, energy and free-volume balance is developed to quantitatively describe the dissipation system of shear-band propagation in the local plastic region. The analytical expressions for shear-localization time, shear-band thickness and critical energy dissipated within the band are obtained. Calculations demonstrate that the shear-band propagation process is dominated by the free-volume softening, rather than the thermal softening. The latter increases the band thickness slightly but decreases the corresponding critical dissipation energy somewhat. The concept of shear-band toughness is further introduced to measure the inherent resistance capability of materials to the propagation of shear bands in BMGs. These results assist in more comprehensively understanding the evolution mechanism of the shear bands, and in guiding alloy design to enhance the toughness of BMGs. (C) 2011 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
学科主题	Materials Science ; Metallurgy & Metallurgical Engineering
分类号	一类
收录类别	SCI ; EI
资助信息	The authors are grateful to Dr. H.S. Zhang and Dr. H.L. Li for their assistance in dynamic tests and AFM observations, respectively. Financial support is from the NSFC (Grant Nos. 10725211, 11002144, 11023001 and 11021262), National Natural Science Foundation of China-NSAF (Grant No. 10976100), the National Basic Research Program of China (Grant No. 2009CB724401) and the Key Project of Chinese Academy of Sciences (No. KJCX2-YW-M04). We are very grateful to two anonymous reviewers for their helpful comments, which have improved our manuscript significantly.
原文出处	http://dx.doi.org/10.1016/j.actamat.2011.03.075
语种	英语
WOS记录号	WOS:000291567900027
公开日期	2012-04-01
内容类型	期刊论文
源URL	[http://dspace.imech.ac.cn/handle/311007/44925]
专题	力学研究所_非线性力学国家重点实验室
推荐引用方式 GB/T 7714	Jiang MQ,Dai LH. Shear-band toughness of bulk metallic glasses[J]. ACTA MATERIALIA,2011,59(11):4525-4537.
APA	Jiang MQ,&Dai LH.(2011).Shear-band toughness of bulk metallic glasses.ACTA MATERIALIA,59(11),4525-4537.
MLA	Jiang MQ,et al."Shear-band toughness of bulk metallic glasses".ACTA MATERIALIA 59.11(2011):4525-4537.