Densification and Strain Hardening of a Metallic Glass under Tension at Room Temperature
The deformation of metallic glasses involves two competing processes: a disordering process involving dilatation, free volume accumulation, and softening, and a relaxation process involving diffusional ordering and densification. For metallic glasses at room temperature and under uniaxial loading, d...
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| Format: | Article |
| Language: | en_US |
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American Physical Society
2014
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| Online Access: | http://hdl.handle.net/1721.1/84981 https://orcid.org/0000-0001-9856-2682 |
| _version_ | 1826208692867956736 |
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| author | Wang, Z. T. Pan, J. Li, Y. Schuh, Christopher A. |
| author2 | Massachusetts Institute of Technology. Department of Materials Science and Engineering |
| author_facet | Massachusetts Institute of Technology. Department of Materials Science and Engineering Wang, Z. T. Pan, J. Li, Y. Schuh, Christopher A. |
| author_sort | Wang, Z. T. |
| collection | MIT |
| description | The deformation of metallic glasses involves two competing processes: a disordering process involving dilatation, free volume accumulation, and softening, and a relaxation process involving diffusional ordering and densification. For metallic glasses at room temperature and under uniaxial loading, disordering usually dominates, and the glass can fail catastrophically as the softening process runs away in a localized mode. Here we demonstrate conditions where the opposite, unexpected, situation occurs: the densifying process dominates, resulting in stable plastic deformation and work hardening at room temperature. We report densification and hardening during deformation in a Zr-based glass under multiaxial loading, in a notched tensile geometry. The effect is driven by stress-enhanced diffusional relaxation, and is attended by a reduction in exothermic heat and hardening signatures similar to those observed in the classical thermal relaxation of glasses. The result is significant, stable, plastic, extensional flow in metallic glasses, which suggest a possibility of designing tough glasses based on their flow properties. |
| first_indexed | 2024-09-23T14:09:46Z |
| format | Article |
| id | mit-1721.1/84981 |
| institution | Massachusetts Institute of Technology |
| language | en_US |
| last_indexed | 2024-09-23T14:09:46Z |
| publishDate | 2014 |
| publisher | American Physical Society |
| record_format | dspace |
| spelling | mit-1721.1/849812022-09-28T18:57:41Z Densification and Strain Hardening of a Metallic Glass under Tension at Room Temperature Wang, Z. T. Pan, J. Li, Y. Schuh, Christopher A. Massachusetts Institute of Technology. Department of Materials Science and Engineering Schuh, Christopher A. The deformation of metallic glasses involves two competing processes: a disordering process involving dilatation, free volume accumulation, and softening, and a relaxation process involving diffusional ordering and densification. For metallic glasses at room temperature and under uniaxial loading, disordering usually dominates, and the glass can fail catastrophically as the softening process runs away in a localized mode. Here we demonstrate conditions where the opposite, unexpected, situation occurs: the densifying process dominates, resulting in stable plastic deformation and work hardening at room temperature. We report densification and hardening during deformation in a Zr-based glass under multiaxial loading, in a notched tensile geometry. The effect is driven by stress-enhanced diffusional relaxation, and is attended by a reduction in exothermic heat and hardening signatures similar to those observed in the classical thermal relaxation of glasses. The result is significant, stable, plastic, extensional flow in metallic glasses, which suggest a possibility of designing tough glasses based on their flow properties. United States. Defense Threat Reduction Agency (Grant HDTRA-11-1-0062) 2014-02-18T17:33:23Z 2014-02-18T17:33:23Z 2013-09 2013-07 Article http://purl.org/eprint/type/JournalArticle 0031-9007 1079-7114 http://hdl.handle.net/1721.1/84981 Wang, Z. T., J. Pan, Y. Li, and C. A. Schuh. “Densification and Strain Hardening of a Metallic Glass under Tension at Room Temperature.” Physical Review Letters 111, no. 13 (September 2013). © 2013 American Physical Society https://orcid.org/0000-0001-9856-2682 en_US http://dx.doi.org/10.1103/PhysRevLett.111.135504 Physical Review Letters Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use. application/pdf American Physical Society American Physical Society |
| spellingShingle | Wang, Z. T. Pan, J. Li, Y. Schuh, Christopher A. Densification and Strain Hardening of a Metallic Glass under Tension at Room Temperature |
| title | Densification and Strain Hardening of a Metallic Glass under Tension at Room Temperature |
| title_full | Densification and Strain Hardening of a Metallic Glass under Tension at Room Temperature |
| title_fullStr | Densification and Strain Hardening of a Metallic Glass under Tension at Room Temperature |
| title_full_unstemmed | Densification and Strain Hardening of a Metallic Glass under Tension at Room Temperature |
| title_short | Densification and Strain Hardening of a Metallic Glass under Tension at Room Temperature |
| title_sort | densification and strain hardening of a metallic glass under tension at room temperature |
| url | http://hdl.handle.net/1721.1/84981 https://orcid.org/0000-0001-9856-2682 |
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