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Dilatancy induced ductile-brittle transition of shear band in metallic glasses

文献类型:期刊论文

作者曾繁.蒋敏强; Dai LH(戴兰宏)
刊名PROCEEDINGS OF THE ROYAL SOCIETY A-MATHEMATICAL PHYSICAL AND ENGINEERING SCIENCES
出版日期2018-04-01
卷号474期号:2212
ISSN号1364-5021
关键词Shear Bands Dilatancy Cutting Ductile-brittle Transition Metallic Glass
DOI10.1098/rspa.2017.0836
文献子类Article
英文摘要Dilatancy-generated structural disordering, an inherent feature of metallic glasses (MGs), has been widely accepted as the physical mechanism for the primary origin and structural evolution of shear banding, as well as the resultant shear failure. However, it remains a great challenge to determine, to what degree of dilatation, a shear banding will evolve into a runaway shear failure. In this work, using in situ acoustic emission monitoring, we probe the dilatancy evolution at the different stages of individual shear band in MGs that underwent severely plastic deformation by the controlled cutting technology. A scaling law is revealed that the dilatancy in a shear band is linearly related to its evolution degree. A transition from ductile-to-brittle shear bands is observed, where the formers dominate stable serrated flow, and the latter lead to a runaway instability (catastrophe failure) of serrated flow. To uncover the underlying mechanics, we develop a theoretical model of shear-band evolution dynamics taking into account an atomic-scale deformation process. Our theoretical results agree with the experimental observations, and demonstrate that the atomic-scale volume expansion arises from an intrinsic shear-band evolution dynamics. Importantly, the onset of the ductile-brittle transition of shear banding is controlled by a critical dilatation.
分类号二类
WOS关键词FREE-VOLUME MODEL ; AMORPHOUS-ALLOYS ; ACOUSTIC-EMISSION ; INHOMOGENEOUS DEFORMATION ; FLOW ; INSTABILITY ; DILATATION ; ZONE ; EVOLUTION ; FAILURE
WOS研究方向Science & Technology - Other Topics
语种英语
WOS记录号WOS:000431112900006
资助机构National Key Research and Development Program of China(2017YFB0702003) ; NSFC(11790292 ; Strategic Priority Research Program of the Chinese Academy of Sciences(XDB22040302) ; Key Research Program of Frontier Sciences of the Chinese Academy of Sciences(QYZDJSSW-JSC011) ; 11472287 ; 11522221)
源URL[http://dspace.imech.ac.cn/handle/311007/77471]  
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
曾繁.蒋敏强,Dai LH. Dilatancy induced ductile-brittle transition of shear band in metallic glasses[J]. PROCEEDINGS OF THE ROYAL SOCIETY A-MATHEMATICAL PHYSICAL AND ENGINEERING SCIENCES,2018,474(2212).
APA 曾繁.蒋敏强,&戴兰宏.(2018).Dilatancy induced ductile-brittle transition of shear band in metallic glasses.PROCEEDINGS OF THE ROYAL SOCIETY A-MATHEMATICAL PHYSICAL AND ENGINEERING SCIENCES,474(2212).
MLA 曾繁.蒋敏强,et al."Dilatancy induced ductile-brittle transition of shear band in metallic glasses".PROCEEDINGS OF THE ROYAL SOCIETY A-MATHEMATICAL PHYSICAL AND ENGINEERING SCIENCES 474.2212(2018).

入库方式: OAI收割

来源:力学研究所

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