IMECH-IR  > 非线性力学国家重点实验室
Dilatancy induced ductile-brittle transition of shear band in metallic glasses
曾繁.蒋敏强; Dai LH(戴兰宏)
发表期刊PROCEEDINGS OF THE ROYAL SOCIETY A-MATHEMATICAL PHYSICAL AND ENGINEERING SCIENCES
2018-04-01
卷号474期号:2212
ISSN1364-5021
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.
关键词Shear Bands Dilatancy Cutting Ductile-brittle Transition Metallic Glass
DOI10.1098/rspa.2017.0836
收录类别SCI ; EI
语种英语
WOS记录号WOS:000431112900006
关键词[WOS]FREE-VOLUME MODEL ; AMORPHOUS-ALLOYS ; ACOUSTIC-EMISSION ; INHOMOGENEOUS DEFORMATION ; FLOW ; INSTABILITY ; DILATATION ; ZONE ; EVOLUTION ; FAILURE
WOS研究方向Science & Technology - Other Topics
WOS类目Multidisciplinary Sciences
项目资助者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)
论文分区二类
力学所作者排名1
引用统计
文献类型期刊论文
条目标识符http://dspace.imech.ac.cn/handle/311007/77471
专题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).
条目包含的文件
条目无相关文件。
个性服务
推荐该条目
保存到收藏夹
查看访问统计
导出为Endnote文件
谷歌学术
谷歌学术中相似的文章
[曾繁.蒋敏强]的文章
[戴兰宏]的文章
百度学术
百度学术中相似的文章
[曾繁.蒋敏强]的文章
[戴兰宏]的文章
必应学术
必应学术中相似的文章
[曾繁.蒋敏强]的文章
[戴兰宏]的文章
相关权益政策
暂无数据
收藏/分享
所有评论 (0)
暂无评论
 

除非特别说明,本系统中所有内容都受版权保护,并保留所有权利。