Cryogenic-temperature-induced transition from shear to dilatational failure in metallic glasses

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	Cryogenic-temperature-induced transition from shear to dilatational failure in metallic glasses
	Jiang MQ(蒋敏强); Wilde G; Chen JH; Qu CB; Fu SY; Jiang F; Dai LH(戴兰宏); Jiang, MQ (reprint author), Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech, 15 Beisihuanxi Rd, Beijing 100190, Peoples R China.
发表期刊	Acta Materialia
	2014-09-15
卷号	77 页码:248-257
ISSN	1359-6454
摘要	At temperatures well below the glass transition temperature, the failure of metallic glasses is generally induced by shear banding, which is a result of the self-organized shear transformation zones (STZs). Here, we demonstrate that, upon cooling down to liquid helium temperature (4.2 K), a Zr-based bulk metallic glass under quasi-static uniaxial tension can fracture via cavitation, rather than by shear banding, showing a transition from shear- to dilatation-dominated failure. This transition is supported by the breakdown of low-temperature strengthening of materials, as well as the changes in the macroscopic failure mode from shear to tension and in the microscopic fracture morphology from vein patterns to fine dimples or nanoscale periodic corrugations. According to the Mohr-Coulomb criterion, it is revealed that the capability of this glass to dilatation is enhanced with decreasing temperature, indicating the temperature-dependent normal stress sensitivity of failure. Our result implies that the shear-dominated STZs will convert into dilatation-dominated operations at very low temperatures. (C) 2014 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
关键词	Metallic Glass Shear Band Shear Transformation Zone Dilatation Cryogenic Temperature
学科领域	Materials Science ; Metallurgy & Metallurgical Engineering
URL	查看原文
收录类别	SCI ; EI
语种	英语
WOS记录号	WOS:000340303200023
项目资助者	The authors are very grateful to Konrad Samwer for enlightening discussion and H.M. Xiao, Z. Ling and G.H. Duan for technical assistance. This work was supported by the National Nature Science Foundation of China (Grant Nos. 11372315, 11132011, 11023001 and 51171138). M.Q.J. acknowledges the Alexander von Humboldt Foundation for support with a post-doctoral fellowship. 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/311007/49061
专题	非线性力学国家重点实验室
通讯作者	Jiang, MQ (reprint author), Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech, 15 Beisihuanxi Rd, Beijing 100190, Peoples R China.
推荐引用方式 GB/T 7714	Jiang MQ,Wilde G,Chen JH,et al. Cryogenic-temperature-induced transition from shear to dilatational failure in metallic glasses[J]. Acta Materialia,2014,77:248-257.
APA	Jiang MQ.,Wilde G.,Chen JH.,Qu CB.,Fu SY.,...&Jiang, MQ .(2014).Cryogenic-temperature-induced transition from shear to dilatational failure in metallic glasses.Acta Materialia,77,248-257.
MLA	Jiang MQ,et al."Cryogenic-temperature-induced transition from shear to dilatational failure in metallic glasses".Acta Materialia 77(2014):248-257.

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