Cooling under Applied Stress Rejuvenates Amorphous Alloys and Enhances Their Ductility
The effect of tensile stress applied during cooling of binary glasses on the potential energy states and mechanical properties is investigated using molecular dynamics simulations. We study the three-dimensional binary mixture that was first annealed near the glass transition temperature and then ra...
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| Format: | Article |
| Language: | English |
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MDPI AG
2020-12-01
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| Series: | Metals |
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| Online Access: | https://www.mdpi.com/2075-4701/11/1/67 |
| _version_ | 1797542918535249920 |
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| author | Nikolai V. Priezjev |
| author_facet | Nikolai V. Priezjev |
| author_sort | Nikolai V. Priezjev |
| collection | DOAJ |
| description | The effect of tensile stress applied during cooling of binary glasses on the potential energy states and mechanical properties is investigated using molecular dynamics simulations. We study the three-dimensional binary mixture that was first annealed near the glass transition temperature and then rapidly cooled under tension into the glass phase. It is found that at larger values of applied stress, the liquid glass former freezes under higher strain and its potential energy is enhanced. For a fixed cooling rate, the maximum tensile stress that can be applied during cooling is reduced upon increasing initial temperature above the glass transition point. We also show that the amorphous structure of rejuvenated glasses is characterized by an increase in the number of contacts between smaller type atoms. Furthermore, the results of tensile tests demonstrate that the elastic modulus and the peak value of the stress overshoot are reduced in glasses prepared at larger applied stresses and higher initial temperatures, thus indicating enhanced ductility. These findings might be useful for the development of processing and fabrication methods to improve plasticity of bulk metallic glasses. |
| first_indexed | 2024-03-10T13:37:20Z |
| format | Article |
| id | doaj.art-f8a123e52bc646df8c50836e220ea752 |
| institution | Directory Open Access Journal |
| issn | 2075-4701 |
| language | English |
| last_indexed | 2024-03-10T13:37:20Z |
| publishDate | 2020-12-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Metals |
| spelling | doaj.art-f8a123e52bc646df8c50836e220ea7522023-11-21T07:27:50ZengMDPI AGMetals2075-47012020-12-011116710.3390/met11010067Cooling under Applied Stress Rejuvenates Amorphous Alloys and Enhances Their DuctilityNikolai V. Priezjev0Department of Mechanical and Materials Engineering, Wright State University, Dayton, OH 45435, USAThe effect of tensile stress applied during cooling of binary glasses on the potential energy states and mechanical properties is investigated using molecular dynamics simulations. We study the three-dimensional binary mixture that was first annealed near the glass transition temperature and then rapidly cooled under tension into the glass phase. It is found that at larger values of applied stress, the liquid glass former freezes under higher strain and its potential energy is enhanced. For a fixed cooling rate, the maximum tensile stress that can be applied during cooling is reduced upon increasing initial temperature above the glass transition point. We also show that the amorphous structure of rejuvenated glasses is characterized by an increase in the number of contacts between smaller type atoms. Furthermore, the results of tensile tests demonstrate that the elastic modulus and the peak value of the stress overshoot are reduced in glasses prepared at larger applied stresses and higher initial temperatures, thus indicating enhanced ductility. These findings might be useful for the development of processing and fabrication methods to improve plasticity of bulk metallic glasses.https://www.mdpi.com/2075-4701/11/1/67metallic glassesglass transitionrejuvenationthermomechanical processingyield stressmolecular dynamics simulations |
| spellingShingle | Nikolai V. Priezjev Cooling under Applied Stress Rejuvenates Amorphous Alloys and Enhances Their Ductility Metals metallic glasses glass transition rejuvenation thermomechanical processing yield stress molecular dynamics simulations |
| title | Cooling under Applied Stress Rejuvenates Amorphous Alloys and Enhances Their Ductility |
| title_full | Cooling under Applied Stress Rejuvenates Amorphous Alloys and Enhances Their Ductility |
| title_fullStr | Cooling under Applied Stress Rejuvenates Amorphous Alloys and Enhances Their Ductility |
| title_full_unstemmed | Cooling under Applied Stress Rejuvenates Amorphous Alloys and Enhances Their Ductility |
| title_short | Cooling under Applied Stress Rejuvenates Amorphous Alloys and Enhances Their Ductility |
| title_sort | cooling under applied stress rejuvenates amorphous alloys and enhances their ductility |
| topic | metallic glasses glass transition rejuvenation thermomechanical processing yield stress molecular dynamics simulations |
| url | https://www.mdpi.com/2075-4701/11/1/67 |
| work_keys_str_mv | AT nikolaivpriezjev coolingunderappliedstressrejuvenatesamorphousalloysandenhancestheirductility |