Shear-band toughness of bulk metallic glasses

doi:10.1016/j.actamat.2011.03.075

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	Shear-band toughness of bulk metallic glasses
	Jiang MQ(蒋敏强); Dai LH(戴兰宏); Dai, LH (reprint author), Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech, Beijing 100190, Peoples R China
发表期刊	ACTA MATERIALIA
	2011
卷号	59 期号:11 页码:4525-4537
ISSN	1359-6454
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.
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
学科领域	Materials Science ; Metallurgy & Metallurgical Engineering
DOI	10.1016/j.actamat.2011.03.075
URL	查看原文
收录类别	SCI ; EI
语种	英语
WOS记录号	WOS:000291567900027
项目资助者	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.
课题组名称	LNM冲击动力学与新型材料力学性能
论文分区	一类
引用统计	被引频次：49[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/311007/44925
专题	非线性力学国家重点实验室
通讯作者	Dai, LH (reprint author), Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech, Beijing 100190, Peoples R China
推荐引用方式 GB/T 7714	Jiang MQ,Dai LH,Dai, LH . Shear-band toughness of bulk metallic glasses[J]. ACTA MATERIALIA,2011,59,11,:4525-4537.
APA	Jiang MQ,Dai LH,&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.

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