Microstructure, crystallization and shape memory behavior of titania and yttria co-doped zirconia

Zeng, Xiao Mei; Du, Zehui; Schuh, Christopher A.; Tamura, Nobumichi; Gan, Chee Lip

doi:10.1016/j.jeurceramsoc.2015.11.042

Cited by 40 publications

(27 citation statements)

References 38 publications

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“…The behavior of Pillar 3 under micro-compression is similar to that reported earlier for related materials [10,18], showing significant deformation with signatures of martensitic transformation. A thorough study of the phase transformation was conducted on pre-compressed Pillar 3 using mXRD, by mapping it at different temperatures from 25 to 700 C, as shown in Fig.…”

Section: Mechanically Compressed Zirconia Pillarsupporting

confidence: 85%

“…The bulk YTDZ ceramics were prepared using a conventional ceramic fabrication procedure, taking a powder / compaction / sintering approach, the details of which were described in our previous work [10]. The surface morphology of the polycrystalline ceramics was characterized with scanning electron microscopy (SEM, equipped with a field emission gun, FEI Nova 600i Nanolab), as shown in Fig.…”

Section: Materials Preparation and Characteristicsmentioning

confidence: 99%

“…Recently we reported a new class of shape memory ceramics: micron-sized single-crystal zirconia [9]. These ceramics exhibit strains comparable to metals but have higher strength and potentially higher operating temperatures than metals [10,11] for applications like solid state actuators [12]. The microscale single crystal structure, characterized by a large surface area-to-volume ratio and absence of grain boundaries, helps to accommodate transformation-induced stress and thus eliminate cracks [13e15].…”

Section: Introductionmentioning

confidence: 99%

“…The microscale single crystal structure, characterized by a large surface area-to-volume ratio and absence of grain boundaries, helps to accommodate transformation-induced stress and thus eliminate cracks [13e15]. As a result, small volume form factors enable the occurrence of stress-induced martensitic transformation between the tetragonal and monoclinic phases in zirconia, with a significant attendant shape change [10,11].…”

Section: Introductionmentioning

confidence: 99%

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In-situ studies on martensitic transformation and high-temperature shape memory in small volume zirconia

Zeng

Tamura

et al. 2017

Acta Materialia

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Shape memory effect (SME) High temperature deformation High temperature shape memory ceramics a b s t r a c t Recently, the shape memory effect with significant recoverable shape deformation has been discovered in small volume single-crystal zirconia. The application potential for such shape memory ceramics has spurred in-depth exploration of the martensitic transformation crystallography and high temperature shape memory effect. In this work, the martensitic transformation of micron-sized zirconia has been studied in both a pristine as-produced condition and after micromechanical compression, using synchrotron scanning micro X-ray diffraction (mXRD). The pristine zirconia was found to transform into the monoclinic phase via a different crystallographic path than the compressed zirconia, resulting in distinct monoclinic variant preferences. The characteristic martensitic transformation temperatures were also found to be higher after uniaxial compression than in the pristine condition. Such observations provide insight on the differences between stress-induced and thermally-induced martensitic transformation. Moreover, we have observed a full cycle of the shape memory effect with large recoverable strain (7%) in micron-sized zirconia at a temperature of 400 C. Our findings provide an important guideline to tailor the high-temperature shape memory properties of zirconia for further scientific research and engineering applications.

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Section: Mechanically Compressed Zirconia Pillarsupporting

confidence: 85%

Section: Materials Preparation and Characteristicsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

In-situ studies on martensitic transformation and high-temperature shape memory in small volume zirconia

Zeng

Tamura

et al. 2017

Acta Materialia

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“…Mechanical behavior of YSZ has been intensively investigated. There are several studies on microscale mechanical testing, which mostly highlight superior superelasticity and shape memory effect at room temperature owing to martensitic transformation [12][13][14][15][16][17][18]. However, our understanding on deformation mechanisms of microscale YSZ at elevated temperatures remains lim-ited.…”

Section: Introductionmentioning

confidence: 99%

Study of deformation mechanisms in flash-sintered yttria-stabilized zirconia by in-situ micromechanical testing at elevated temperatures

Cho

Wang

et al. 2019

Materials Research Letters

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Flash sintering has received wide attention lately due to its ultrafast densification process at low sintering temperature. However, the deformability of flash-sintered ceramics remains poorly understood. Yttria-stabilized zirconia (YSZ) was processed by flash sintering to study deformation mechanism. Transmission electron microscopy studies show that the flash-sintered YSZ contains ultrafine grains and dislocations. Strain rate jump tests at elevated temperature by in-situ microcompression indicate the existence of a large threshold stress. The activation energy of deformation is ∼ 145 kJ/mol, similar to the activation energy for oxygen vacancy migration. The deformation mechanisms of the flash-sintered YSZ at elevated temperatures are discussed. IMPACT STATEMENTThe current study reveals the underlying deformation mechanisms of flash-sintered 3YSZ that shows considerable plasticity over the temperature range of 450-650°C via in-situ microcompression test. ARTICLE HISTORY

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Robust Cellular Shape‐Memory Ceramics via Gradient‐Controlled Freeze Casting

2019

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Shape‐memory ceramics offer promise for applications like actuation and energy damping, due to their unique properties of high specific strength, high ductility, and inertness in harsh environments. To date, shape‐memory behavior in ceramics is limited to micro‐/submicro‐scale pillars and particles to circumvent the longstanding problem of transformation‐induced fracture which occurs readily in bulk polycrystalline specimens. The challenge, therefore, lies in the realization of shape‐memory properties in bulk ceramics, which requires careful design of 3D structures that locally mimic pillar structures. Herein, it is demonstrated that with a gradient‐controlled freeze‐casting approach, honeycomb‐like cellular structures can be fabricated with thin and directionally aligned walls to facilitate martensitic transformation under compression without fracture. With this approach, robust bulk shape‐memory ceramics are demonstrated in a highly porous structure under compressive stresses of 25 MPa and strains up to 7.5%.

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Microstructure, crystallization and shape memory behavior of titania and yttria co-doped zirconia

Cited by 40 publications

References 38 publications

In-situ studies on martensitic transformation and high-temperature shape memory in small volume zirconia

In-situ studies on martensitic transformation and high-temperature shape memory in small volume zirconia

Study of deformation mechanisms in flash-sintered yttria-stabilized zirconia by in-situ micromechanical testing at elevated temperatures

Robust Cellular Shape‐Memory Ceramics via Gradient‐Controlled Freeze Casting

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