| 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 Publication | PERGAMON-ELSEVIER SCIENCE LTD
 |
| ISSN | 1359-6454 |
| Volume | 136Pages:126-133 |
| Abstract | 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.; 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 |
| Keyword | Bulk Metallic Glasses Triaxial Stress State Ductile Fracture Cavitation Decohesion Stress |
| Subject Area | Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering |
| Funding Organization | National Natural Science Foundation of China [51401220, 51471165] |
| Indexed By | SCI |
| Language | 英语 |
| WOS ID | WOS:000407665300012 |
| Citation statistics | |
| Document Type | 期刊论文 |
| Identifier | http://ir.imr.ac.cn/handle/321006/79130 |
| Collection | 中国科学院金属研究所 |
| Corresponding Author | Li, 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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