Origin of Shear Stability and Compressive Ductility Enhancement of Metallic Glasses by Metal Coating
Metallic glasses (MGs) are notorious for the poor macroscopic ductility and to overcome the weakness various intrinsic and extrinsic strategies have been proposed in past decades. Among them, the metal coating is regarded as a flexible and facile approach, yet the physical origin is poorly understoo...
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| Format: | Online |
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Nature Publishing Group
2016
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| Online Access: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4897694/ |
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pubmed-4897694 |
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pubmed-48976942016-06-10 Origin of Shear Stability and Compressive Ductility Enhancement of Metallic Glasses by Metal Coating Sun, B. A. Chen, S. H. Lu, Y. M. Zhu, Z. G. Zhao, Y. L. Yang, Y. Chan, K. C. Liu, C. T. Article Metallic glasses (MGs) are notorious for the poor macroscopic ductility and to overcome the weakness various intrinsic and extrinsic strategies have been proposed in past decades. Among them, the metal coating is regarded as a flexible and facile approach, yet the physical origin is poorly understood due to the complex nature of shear banding process. Here, we studied the origin of ductile enhancement in the Cu-coating both experimentally and theoretically. By examining serrated shear events and their stability of MGs, we revealed that the thin coating layer plays a key role in stopping the final catastrophic failure of MGs by slowing down shear band dynamics and thus retarding its attainment to a critical instable state. The mechanical analysis on interplay between the coating layer and shear banding process showed the enhanced shear stability mainly comes from the lateral tension of coating layer induced by the surface shear step and the bonding between the coating layer and MGs rather than the layer thickness is found to play a key role in contributing to the shear stability. Nature Publishing Group 2016-06-08 /pmc/articles/PMC4897694/ /pubmed/27271435 http://dx.doi.org/10.1038/srep27852 Text en Copyright © 2016, Macmillan Publishers Limited http://creativecommons.org/licenses/by/4.0/ This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/ |
| repository_type |
Open Access Journal |
| institution_category |
Foreign Institution |
| institution |
US National Center for Biotechnology Information |
| building |
NCBI PubMed |
| collection |
Online Access |
| language |
English |
| format |
Online |
| author |
Sun, B. A. Chen, S. H. Lu, Y. M. Zhu, Z. G. Zhao, Y. L. Yang, Y. Chan, K. C. Liu, C. T. |
| spellingShingle |
Sun, B. A. Chen, S. H. Lu, Y. M. Zhu, Z. G. Zhao, Y. L. Yang, Y. Chan, K. C. Liu, C. T. Origin of Shear Stability and Compressive Ductility Enhancement of Metallic Glasses by Metal Coating |
| author_facet |
Sun, B. A. Chen, S. H. Lu, Y. M. Zhu, Z. G. Zhao, Y. L. Yang, Y. Chan, K. C. Liu, C. T. |
| author_sort |
Sun, B. A. |
| title |
Origin of Shear Stability and Compressive Ductility Enhancement of Metallic Glasses by Metal Coating |
| title_short |
Origin of Shear Stability and Compressive Ductility Enhancement of Metallic Glasses by Metal Coating |
| title_full |
Origin of Shear Stability and Compressive Ductility Enhancement of Metallic Glasses by Metal Coating |
| title_fullStr |
Origin of Shear Stability and Compressive Ductility Enhancement of Metallic Glasses by Metal Coating |
| title_full_unstemmed |
Origin of Shear Stability and Compressive Ductility Enhancement of Metallic Glasses by Metal Coating |
| title_sort |
origin of shear stability and compressive ductility enhancement of metallic glasses by metal coating |
| description |
Metallic glasses (MGs) are notorious for the poor macroscopic ductility and to overcome the weakness various intrinsic and extrinsic strategies have been proposed in past decades. Among them, the metal coating is regarded as a flexible and facile approach, yet the physical origin is poorly understood due to the complex nature of shear banding process. Here, we studied the origin of ductile enhancement in the Cu-coating both experimentally and theoretically. By examining serrated shear events and their stability of MGs, we revealed that the thin coating layer plays a key role in stopping the final catastrophic failure of MGs by slowing down shear band dynamics and thus retarding its attainment to a critical instable state. The mechanical analysis on interplay between the coating layer and shear banding process showed the enhanced shear stability mainly comes from the lateral tension of coating layer induced by the surface shear step and the bonding between the coating layer and MGs rather than the layer thickness is found to play a key role in contributing to the shear stability. |
| publisher |
Nature Publishing Group |
| publishDate |
2016 |
| url |
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4897694/ |
| _version_ |
1613590843502886912 |