Granular shape memory ceramic packings
Although bulk shape memory ceramics (SMCs) are brittle, in particulate form they exhibit large recoverable strains in both shape memory and superelastic modes. Here, we investigate the fundamentals of mechanically- and thermally-triggered martensitic transformation of granular SMC packings. Specific...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | en_US |
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Elsevier BV
2020
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| Online Access: | https://hdl.handle.net/1721.1/123686 |
| _version_ | 1826204774453739520 |
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| author | Yu, Hang Hassani Gangaraj, Seyyed Mostafa Du, Zehui Gan, Chee Lip 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 Yu, Hang Hassani Gangaraj, Seyyed Mostafa Du, Zehui Gan, Chee Lip Schuh, Christopher A |
| author_sort | Yu, Hang |
| collection | MIT |
| description | Although bulk shape memory ceramics (SMCs) are brittle, in particulate form they exhibit large recoverable strains in both shape memory and superelastic modes. Here, we investigate the fundamentals of mechanically- and thermally-triggered martensitic transformation of granular SMC packings. Specifically, (ZrO2)1-x-(CeO2)x is studied in three different composition regimes. In the shape memory regime (below the martensite finish temperature), confined uniaxial compression leads to martensite re-orientation in the granular SMC packing, with the peak intensity of preferred crystallographic orientation increasing with external loading. In the intermediate regime (between austenite start and martensite start temperatures), confined uniaxial compression leads to irreversible martensitic transformation with the transformed volume increasing with external loading. This provides direct evidence of stress-induced martensitic transformation in granular SMCs. In the superelastic regime (above the austenite finish temperature), confined uniaxial compression leads to forward (during loading) and reverse (during unloading) martensitic transformation, manifesting in a large hysteresis loop in each load-unload cycle with remarkably high energy dissipation density. Based on finite element modeling of SMC particles in contact, we explore the martensitic transformation under non-uniform Hertzian stresses, which in turn provides insight on the experimental results. Keywords: Shape memory; Granular materials; Zirconia; Martensitic transformation; Superelasticity |
| first_indexed | 2024-09-23T13:00:52Z |
| format | Article |
| id | mit-1721.1/123686 |
| institution | Massachusetts Institute of Technology |
| language | en_US |
| last_indexed | 2024-09-23T13:00:52Z |
| publishDate | 2020 |
| publisher | Elsevier BV |
| record_format | dspace |
| spelling | mit-1721.1/1236862022-09-28T11:28:58Z Granular shape memory ceramic packings Yu, Hang Hassani Gangaraj, Seyyed Mostafa Du, Zehui Gan, Chee Lip Schuh, Christopher A Massachusetts Institute of Technology. Department of Materials Science and Engineering Schuh, Christopher A. Although bulk shape memory ceramics (SMCs) are brittle, in particulate form they exhibit large recoverable strains in both shape memory and superelastic modes. Here, we investigate the fundamentals of mechanically- and thermally-triggered martensitic transformation of granular SMC packings. Specifically, (ZrO2)1-x-(CeO2)x is studied in three different composition regimes. In the shape memory regime (below the martensite finish temperature), confined uniaxial compression leads to martensite re-orientation in the granular SMC packing, with the peak intensity of preferred crystallographic orientation increasing with external loading. In the intermediate regime (between austenite start and martensite start temperatures), confined uniaxial compression leads to irreversible martensitic transformation with the transformed volume increasing with external loading. This provides direct evidence of stress-induced martensitic transformation in granular SMCs. In the superelastic regime (above the austenite finish temperature), confined uniaxial compression leads to forward (during loading) and reverse (during unloading) martensitic transformation, manifesting in a large hysteresis loop in each load-unload cycle with remarkably high energy dissipation density. Based on finite element modeling of SMC particles in contact, we explore the martensitic transformation under non-uniform Hertzian stresses, which in turn provides insight on the experimental results. Keywords: Shape memory; Granular materials; Zirconia; Martensitic transformation; Superelasticity 2020-01-27T20:40:22Z 2020-01-27T20:40:22Z 2017-06 2016-12 Article http://purl.org/eprint/type/JournalArticle 1359-6454 https://hdl.handle.net/1721.1/123686 Yu, Hang Z. et al. "Granular shape memory ceramic packings." Acta Materialia 132 (June 2017): 455-466 © 2017 Acta Materialia Inc en_US http://dx.doi.org/10.1016/j.actamat.2017.04.057 Acta Materialia Creative Commons Attribution-NonCommercial-NoDerivs License http://creativecommons.org/licenses/by-nc-nd/4.0/ application/msword application/pdf Elsevier BV Prof. Schuh via Erja Kajosalo |
| spellingShingle | Yu, Hang Hassani Gangaraj, Seyyed Mostafa Du, Zehui Gan, Chee Lip Schuh, Christopher A Granular shape memory ceramic packings |
| title | Granular shape memory ceramic packings |
| title_full | Granular shape memory ceramic packings |
| title_fullStr | Granular shape memory ceramic packings |
| title_full_unstemmed | Granular shape memory ceramic packings |
| title_short | Granular shape memory ceramic packings |
| title_sort | granular shape memory ceramic packings |
| url | https://hdl.handle.net/1721.1/123686 |
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