On the origin of shear banding instability in metallic glasses

doi:10.1016/j.jmps.2009.04.008

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	On the origin of shear banding instability in metallic glasses
	Jiang MQ(蒋敏强); Dai LH(戴兰宏)
发表期刊	Journal of The Mechanics and Physics of Solids
	2009
卷号	57 期号:8 页码:1267-1292
ISSN	0022-5096
摘要	To uncover the physical origin of shear-banding instability in metallic glass (MG), a theoretical description of thermo-mechanical deformation of MG undergoing one-dimensional simple shearing is presented. The coupled thermo-mechanical model takes into account the momentum balance, the energy balance and the dynamics of free volume. The interplay between free-volume production and temperature increase being two potential causes for shear-banding instability is examined on the basis of the homogeneous solution. It is found that the free-volume production facilitates the sudden increase in the temperature before instability and vice versa. A rigorous linear perturbation analysis is used to examine the inhomogeneous deformation, during which the onset criteria and the internal length and time scales for three types of instabilities, namely free-volume softening, thermal softening and coupling softening, are clearly revealed. The shear-banding instability originating from sole free-volume softening takes place easier and faster than that due to sole thermal softening, and dominates in the coupling softening. Furthermore, the coupled thermo-mechanical shear-band analysis does show that an initial slight distribution of local free volume can incur significant strain localization, producing a shear band. During such a localization process, the local free-volume creation occurs indeed prior to the increase in local temperature, indicating that the former is the cause of shear localization, whereas the latter is its consequence. Finally, extension of the above model to include the shear-induced dilatation shows that such dilatation facilitates the shear instability in metallic glasses.
学科领域	固体力学
DOI	10.1016/j.jmps.2009.04.008
收录类别	SCI
语种	英语
WOS记录号	WOS:000268346000008
关键词[WOS]	BULK AMORPHOUS-ALLOYS ; MECHANICAL-PROPERTIES ; SUPERCOOLED LIQUID ; MATRIX COMPOSITES ; DEBORAH NUMBER ; STRAIN-RATES ; PLASTIC-FLOW ; DEFORMATION ; LOCALIZATION ; BEHAVIOR
WOS研究方向	Materials Science ; Mechanics ; Physics
WOS类目	Materials Science, Multidisciplinary ; Mechanics ; Physics, Condensed Matter
引用统计	被引频次：186[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/311007/28755
专题	非线性力学国家重点实验室
通讯作者	Dai LH(戴兰宏)
推荐引用方式 GB/T 7714	Jiang MQ,Dai LH. On the origin of shear banding instability in metallic glasses[J]. Journal of The Mechanics and Physics of Solids,2009,57,8,:1267-1292.
APA	蒋敏强,&戴兰宏.(2009).On the origin of shear banding instability in metallic glasses.Journal of The Mechanics and Physics of Solids,57(8),1267-1292.
MLA	蒋敏强,et al."On the origin of shear banding instability in metallic glasses".Journal of The Mechanics and Physics of Solids 57.8(2009):1267-1292.

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