dc.contributor.authorYu, Hang Z.
dc.contributor.authorHassani-Gangaraj, Mostafa
dc.contributor.authorDu, Zehui
dc.contributor.authorGan, Chee Lip
dc.contributor.authorSchuh, Christopher A.
dc.identifier.citationYu, H. Z., Hassani-Gangaraj, M., Du, Z., Gan, C. L., & Schuh, C. A. (2017). Granular shape memory ceramic packings. Acta Materialia, 132, 455-466.en_US
dc.description.abstractAlthough 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.en_US
dc.relation.ispartofseriesActa Materialiaen_US
dc.rights© 2017 Acta Materialia (published by Elsevier)en_US
dc.subjectShape memoryen_US
dc.subjectGranular materialsen_US
dc.titleGranular shape memory ceramic packingsen_US
dc.typeJournal Article
dc.contributor.researchTemasek Laboratoriesen_US
dc.contributor.schoolSchool of Materials Science and Engineeringen_US

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