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...
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sg-ntu-dr.10356-831052020-06-01T10:13:38Z Granular shape memory ceramic packings Yu, Hang Z. Hassani-Gangaraj, Mostafa Du, Zehui Gan, Chee Lip Schuh, Christopher A. School of Materials Science & Engineering Temasek Laboratories Shape memory Granular materials 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. 2017-05-15T07:45:37Z 2019-12-06T15:11:57Z 2017-05-15T07:45:37Z 2019-12-06T15:11:57Z 2017 2017 Journal Article Yu, H. Z., Hassani-Gangaraj, M., Du, Z., Gan, C. L., & Schuh, C. A. (2017). Granular shape memory ceramic packings. Acta Materialia, 132, 455-466. 1359-6454 https://hdl.handle.net/10356/83105 http://hdl.handle.net/10220/42423 10.1016/j.actamat.2017.04.057 200368 en Acta Materialia © 2017 Acta Materialia (published by Elsevier) |
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Shape memory Granular materials Yu, Hang Z. Hassani-Gangaraj, Mostafa Du, Zehui Gan, Chee Lip Schuh, Christopher A. Granular shape memory ceramic packings |
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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. |
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School of Materials Science & Engineering |
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School of Materials Science & Engineering Yu, Hang Z. Hassani-Gangaraj, Mostafa Du, Zehui Gan, Chee Lip Schuh, Christopher A. |
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Yu, Hang Z. Hassani-Gangaraj, Mostafa Du, Zehui Gan, Chee Lip Schuh, Christopher A. |
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Yu, Hang Z. |
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Granular shape memory ceramic packings |
title_short |
Granular shape memory ceramic packings |
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Granular shape memory ceramic packings |
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Granular shape memory ceramic packings |
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Granular shape memory ceramic packings |
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granular shape memory ceramic packings |
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2017 |
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https://hdl.handle.net/10356/83105 http://hdl.handle.net/10220/42423 |
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