Medium-Range Order Resists Deformation in Metallic Liquids and Glasses
In crystals, lattice defects, such as dislocations, control mechanical deformation. Similarly, it is widely believed that even in glasses and liquids some kinds of defects, strongly disordered regions, play a major role in deformation. To identify defects researchers focused on the nature of the sho...
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| Format: | Article |
| Language: | English |
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MDPI AG
2023-02-01
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| Series: | Metals |
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| Online Access: | https://www.mdpi.com/2075-4701/13/3/442 |
| _version_ | 1827748683494457344 |
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| author | Takeshi Egami Wojciech Dmowski Chae Woo Ryu |
| author_facet | Takeshi Egami Wojciech Dmowski Chae Woo Ryu |
| author_sort | Takeshi Egami |
| collection | DOAJ |
| description | In crystals, lattice defects, such as dislocations, control mechanical deformation. Similarly, it is widely believed that even in glasses and liquids some kinds of defects, strongly disordered regions, play a major role in deformation. To identify defects researchers focused on the nature of the short-range order (SRO) in the nearest neighbor cage of atoms. However, recent results by experiment, simulation and theory raise serious questions about this assumption. They suggest that the atomic medium-range order (MRO) provides resistance against flow at the atomic level. Because the MRO is a bulk property, it implies that defects play only a limited role. This new insight is supported by the density wave theory which shows that the MRO is driven by a top-down global force, rather than being a consequence of the SRO in the bottom-up manner, and the MRO provides stiffness to resist deformation. We briefly summarize the density wave theory, show that the MRO is related to ductility of metallic glasses, and discuss the implications on the role of the MRO in the atomic-level mechanism of deformation. |
| first_indexed | 2024-03-11T06:11:18Z |
| format | Article |
| id | doaj.art-61992e251ccf496a9f26d095992ee602 |
| institution | Directory Open Access Journal |
| issn | 2075-4701 |
| language | English |
| last_indexed | 2024-03-11T06:11:18Z |
| publishDate | 2023-02-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Metals |
| spelling | doaj.art-61992e251ccf496a9f26d095992ee6022023-11-17T12:37:50ZengMDPI AGMetals2075-47012023-02-0113344210.3390/met13030442Medium-Range Order Resists Deformation in Metallic Liquids and GlassesTakeshi Egami0Wojciech Dmowski1Chae Woo Ryu2Shull-Wollan Center and Department of Materials Science and Engineering, University of Tennessee, Knoxville, TN 37996, USAShull-Wollan Center and Department of Materials Science and Engineering, University of Tennessee, Knoxville, TN 37996, USADepartment of Materials Science and Engineering, Hongik University, Seoul 04066, Republic of KoreaIn crystals, lattice defects, such as dislocations, control mechanical deformation. Similarly, it is widely believed that even in glasses and liquids some kinds of defects, strongly disordered regions, play a major role in deformation. To identify defects researchers focused on the nature of the short-range order (SRO) in the nearest neighbor cage of atoms. However, recent results by experiment, simulation and theory raise serious questions about this assumption. They suggest that the atomic medium-range order (MRO) provides resistance against flow at the atomic level. Because the MRO is a bulk property, it implies that defects play only a limited role. This new insight is supported by the density wave theory which shows that the MRO is driven by a top-down global force, rather than being a consequence of the SRO in the bottom-up manner, and the MRO provides stiffness to resist deformation. We briefly summarize the density wave theory, show that the MRO is related to ductility of metallic glasses, and discuss the implications on the role of the MRO in the atomic-level mechanism of deformation.https://www.mdpi.com/2075-4701/13/3/442metallic glassmedium-range-orderliquid viscosityglass deformation |
| spellingShingle | Takeshi Egami Wojciech Dmowski Chae Woo Ryu Medium-Range Order Resists Deformation in Metallic Liquids and Glasses Metals metallic glass medium-range-order liquid viscosity glass deformation |
| title | Medium-Range Order Resists Deformation in Metallic Liquids and Glasses |
| title_full | Medium-Range Order Resists Deformation in Metallic Liquids and Glasses |
| title_fullStr | Medium-Range Order Resists Deformation in Metallic Liquids and Glasses |
| title_full_unstemmed | Medium-Range Order Resists Deformation in Metallic Liquids and Glasses |
| title_short | Medium-Range Order Resists Deformation in Metallic Liquids and Glasses |
| title_sort | medium range order resists deformation in metallic liquids and glasses |
| topic | metallic glass medium-range-order liquid viscosity glass deformation |
| url | https://www.mdpi.com/2075-4701/13/3/442 |
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