In situ investigation of stress-induced martensitic transformation in granular shape memory ceramic packings

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dc.contributor.authorRauch, Hunter A.en
dc.contributor.authorChen, Yanen
dc.contributor.authorAn, Keen
dc.contributor.authorYu, Hang Z.en
dc.contributor.departmentMaterials Science and Engineering (MSE)en
dc.date.accessioned2019-08-13T12:50:16Zen
dc.date.available2019-08-13T12:50:16Zen
dc.date.issued2019-04-15en
dc.description.abstractStress-induced martensitic transformation can occur in granular shape memory materials when individual particles experience high stresses and transform from a high-symmetry austenite phase to a low symmetry martensite phase. This involves a highly heterogeneous distribution of the driving force and very low mechanical constraint for martensite nucleation, so the transformation behavior can be dramatically different from the well-documented case of monolithic solids. In this work, we investigate the stress-induced martensitic transformation in granular shape memory ceramic packings, which consist of single-crystal micro-particles of ZrO2-12 at%CeO2 and ZrO2-15 at%CeO2. Through in situ neutron diffraction, we study how the phase fraction, lattice strain, and integral peak broadness evolve during external loading, unloading, and subsequent heating. Several peculiar features are discovered, including (i) a continuous mode of transformation with a wide range of transformation loads, (ii) co-evolution of the packing structure, contact deformation, and martensitic transformation, and (iii) a strong correlation between the peak broadening and the transformed phase fraction. In addition, we show the first direct evidence of reversible stress-induced martensitic transformation in granular materials. We finally discuss the mechanism for martensite nucleation and growth in granular packings and show how that leads to the observed transformation characteristics.en
dc.description.notesPublic domain – authored by a U.S. government employeeen
dc.identifier.doihttps://doi.org/10.1016/j.actamat.2019.02.028en
dc.identifier.eissn1873-2453en
dc.identifier.issn1359-6454en
dc.identifier.urihttp://hdl.handle.net/10919/93043en
dc.identifier.volume168en
dc.language.isoenen
dc.rightsCreative Commons CC0 1.0 Universal Public Domain Dedicationen
dc.rights.urihttp://creativecommons.org/publicdomain/zero/1.0/en
dc.subjectShape memoryen
dc.subjectZirconiaen
dc.subjectGranular materialsen
dc.subjectMartensitic transformationen
dc.subjectNeutron diffractionen
dc.titleIn situ investigation of stress-induced martensitic transformation in granular shape memory ceramic packingsen
dc.title.serialActa Materialiaen
dc.typeArticle - Refereeden
dc.type.dcmitypeTexten
dc.type.dcmitypeStillImageen

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