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Ductile fracture in notched bulk metallic glasses
Pan, J.; Wang, Y. X.; Li, Y.; Li, Y (reprint author), Chinese Acad Sci, Shenyang Natl Lab Mat Sci, Inst Met Res, Shenyang 110016, Liaoning, Peoples R China.
2017-09-01
Source PublicationPERGAMON-ELSEVIER SCIENCE LTD
ISSN1359-6454
Volume136Pages:126-133
AbstractThe deformation of bulk metallic glasses (BMGs) is generally driven by highly localized shear. Due to such inhomogeneous flow, failure occurs in a catastrophic brittle manner through rapid shear banding, often associated with very limited plastic strain macroscopically. Here, we demonstrate metal-like ductile fracture in Zr-based BMGs under tension, a completely opposite situation, by suppressing shear banding. In the absence of shear bands, nucleation of cavies/voids and subsequent void growth and coalescence dominate the initial plastic failure process, enabling BMGs to display the essential characteristics of ductile fracture, with deep dimples and cup-and-cone morphology. This ductile fracture only occurs in amorphous alloys, but not in the fully crystallized counterpart. Furthermore, the characteristic decohesion strength of the ductile fracture in Zr-based BMGs was found to be 1.75 GPa, one of the highest among engineering metals and alloys. These present findings reveal the previously hidden ductile behavior of BMGs, suggesting an alternative method to enhance the ductility of BMGs by removing shear banding. (C) 2017 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.; The deformation of bulk metallic glasses (BMGs) is generally driven by highly localized shear. Due to such inhomogeneous flow, failure occurs in a catastrophic brittle manner through rapid shear banding, often associated with very limited plastic strain macroscopically. Here, we demonstrate metal-like ductile fracture in Zr-based BMGs under tension, a completely opposite situation, by suppressing shear banding. In the absence of shear bands, nucleation of cavies/voids and subsequent void growth and coalescence dominate the initial plastic failure process, enabling BMGs to display the essential characteristics of ductile fracture, with deep dimples and cup-and-cone morphology. This ductile fracture only occurs in amorphous alloys, but not in the fully crystallized counterpart. Furthermore, the characteristic decohesion strength of the ductile fracture in Zr-based BMGs was found to be 1.75 GPa, one of the highest among engineering metals and alloys. These present findings reveal the previously hidden ductile behavior of BMGs, suggesting an alternative method to enhance the ductility of BMGs by removing shear banding. (C) 2017 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
description.department[pan, j. ; wang, y. x. ; li, y.] chinese acad sci, shenyang natl lab mat sci, inst met res, shenyang 110016, liaoning, peoples r china
KeywordBulk Metallic Glasses Triaxial Stress State Ductile Fracture Cavitation Decohesion Stress
Subject AreaMaterials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
Funding OrganizationNational Natural Science Foundation of China [51401220, 51471165]
Indexed BySCI
Language英语
WOS IDWOS:000407665300012
Citation statistics
Cited Times:38[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/79130
Collection中国科学院金属研究所
Corresponding AuthorLi, Y (reprint author), Chinese Acad Sci, Shenyang Natl Lab Mat Sci, Inst Met Res, Shenyang 110016, Liaoning, Peoples R China.
Recommended Citation
GB/T 7714
Pan, J.,Wang, Y. X.,Li, Y.,et al. Ductile fracture in notched bulk metallic glasses[J]. PERGAMON-ELSEVIER SCIENCE LTD,2017,136:126-133.
APA Pan, J.,Wang, Y. X.,Li, Y.,&Li, Y .(2017).Ductile fracture in notched bulk metallic glasses.PERGAMON-ELSEVIER SCIENCE LTD,136,126-133.
MLA Pan, J.,et al."Ductile fracture in notched bulk metallic glasses".PERGAMON-ELSEVIER SCIENCE LTD 136(2017):126-133.
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