Cyclic martensitic transformations and damage evolution in shape memory zirconia: Single crystals vs polycrystals

Crystal, Isabel R.; Lai, Alan; Schuh, Christopher A.

doi:10.1111/jace.17117

Cited by 15 publications

(7 citation statements)

References 46 publications

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“…[ 108 ] In addition, the comparison of 1.5 and 2.0 mol% yttria stabilized zirconia between single crystal and polycrystalline structure has been analyzed by Crystal et al. [ 109 ] Owing to high ductility, high specific strength, and inertness in harsh environments, SMC is expected to offer promising solutions to the soft actuation applications.…”

Section: Smart Materials Undergoing a Solid–solid Phase Changementioning

confidence: 99%

Latest Advances in Development of Smart Phase Change Material for Soft Actuators

et al. 2021

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Using a phase change material (PCM) to convert energy as a specific medium can date back to three hundred years ago, when steam engines took advantage of water that can evaporate into water vapor to convert energy. PCMs enable themselves to absorb, store, and release energies actively to maintain the object temperature on the basis of ambient temperature. PCMs have a robust 20% compound annual growth rate in the global smart materials market. [1] To this date, extensive works have been conducted to investigate the application of smart PCMs in various scientific, technological, and industrial fields, including energy storage, heat exchanger, [2] water treatment, [3] thermal management of electrical equipment, [4] textile and fabrics, [5,6] biomedical and biocarrier systems, and so on. It has become especially popular in the fields of architectonics and textile manufacture. The latest study by Tung et al. [7] proposed to utilize nanotechnology to fabricate PCMs to develop a novel smart concrete, while PCM-treated textiles have been widely used in apparel and home products, [8] in particular a precool vest invented by Australian Institute of Sport at the 2004 Athens Olympic Games. [9] PCM composites can be formed with additional or modified properties with six "multifeatures" that are multimaterial, multisystem, multimodulus, multiscale, multifunction, and multidimensional (Figure 1). Impregnating PCM into mechanically stable porous materials can improve stability, while adding metallic pieces or foams [10] can increase thermal conductivity; but it is also limited by the convection reduction or elimination in the liquid phase through combining with fast-response materials into PCM. To maintain the mechanical properties of a material, the characteristic dimension of the internal structure of the composite material is at or below the millimeter scale.

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Section: Smart Materials Undergoing a Solid–solid Phase Changementioning

confidence: 99%

Latest Advances in Development of Smart Phase Change Material for Soft Actuators

et al. 2021

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“…In general, the excellent SME/SE performances mentioned above are related to the small-scaling at the level of up to a few microns, based on the approach of eliminating grain boundaries. A recent study by Crystal et al [46] takes a step further by extending the strategy to mm-scale bulk size, in which mm-scale zirconia single crystals withstand cyclic martensitic transformation through 125 cycles without obvious degradation of the strain amplitude of * 3% and cracking. In comparison, the strain of a large zirconia polycrystal sample during the cyclic martensitic transformation is reduced to 1.5% after 10 cycles, and a large specimen mass loss of 35% was observed after 45 cycles due to the cracking.…”

Section: Sme Of Zro 2 At Small Scalesmentioning

confidence: 99%

Recent Developments in Small-Scale Shape Memory Oxides

Wang

Ludwig

2020

Shap. Mem. Superelasticity

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This review presents an overview of the developments in small-scale shape memory materials: from alloys to oxides and ceramics. Shape memory oxides such as zirconia, different ferroelectric perovskites and VO2-based materials have favorable characteristics of high strength, high operating temperature and chemical resistance, which make this class of shape memory materials interesting for special applications, e.g., in harsh environments or at the nanoscale. Because of the constraint and mismatch stress from neighboring grains in polycrystalline/bulk oxides, the transformation strain of shape memory oxides is relatively small, and micro-cracks can appear after some cycles. However, recent progress in shape memory oxide research related to small-scale approaches such as decreasing the amounts of grain boundaries, strain-engineering, and application in the form of nanoscale thin films shows that some oxides are capable to exhibit excellent shape memory effects and superelasticity at nano/micro-scales. The materials systems ZrO2, BiFO3, and VO2 are discussed with respect to their shape memory performance in bulk and small-scale.

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“…For example, Lai et al manufactured zirconia micro-pillars that are able to withstand dozens of transformation cycles at significant strain levels of several percent, indicating great improvement over polycrystalline superelastic zirconia [1]. Large (cm-scale) single crystals of SMC also exhibit highly reversible transformation behavior over many cycles [9].…”

Section: Introductionmentioning

confidence: 99%

“…In the case of SMAs, previous work has investigated the tendency of Cu-based SMAs to fracture along grain boundaries due to strain incompatibilities there [16][17][18]. In SMCs, grain boundary strain incompatibility is less studied, although recent work has provided significant insights [9,[19][20][21]. Pang et al [19] investigated the two-dimensional compatibility of the martensiteaustenite interface via the application of the cofactor conditions as a possible factor controlling the cracking of bulk polycrystalline zirconia-based SMCs.…”

Section: Introductionmentioning

confidence: 99%

Phase transformation and incompatibility at grain boundaries in zirconia-based shape memory ceramics: a micromechanics-based simulation study

et al. 2022

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Zirconia-based shape memory ceramics (SMCs) exhibit anisotropic mechanical response when undergoing elastic deformations as well as during austenite–martensite phase transformation. This behavior results in different types of strain incompatibility at grain boundaries, which we study here using a micromechanical model. A single-crystal model is implemented to provide a full mechanistic three-dimensional description of the anisotropic elastic as well as martensitic transformation stress–strain response, including non-Schmid behavior caused by the significant volume change during martensitic transformation. This model was calibrated to and validated against compression tests of single-crystal zirconia micro-pillars conducted previously, and then used to model bi-crystals. Upon the introduction of a grain boundary, the simulation provides detailed information on the nucleation and evolution of martensite variants and stress distribution at grain boundaries. We identify bi-crystal configurations which result in very large stress concentrations at very low deformations due to elastic incompatibility, as well as others where the elastic incompatibility is relatively low and stress concentrations only occur at large transformation strains. We also show how this approach can be used to explore the misorientation space for quantifying the level of elastic and transformation incompatibility at SMCs grain boundaries. Graphical abstract Micromechanics models provide insights on grain boundary elastic and phase transformation strain incompatibility in shape memory zirconia

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Cyclic martensitic transformations and damage evolution in shape memory zirconia: Single crystals vs polycrystals

Abstract: This is the author manuscript accepted for publication and has undergone full peer review but has not been through the copyediting, typesetting, pagination and proofreading process, which may lead to differences between this version and the Version of Record. Please cite this article as

Cited by 15 publications

References 46 publications

Latest Advances in Development of Smart Phase Change Material for Soft Actuators

Latest Advances in Development of Smart Phase Change Material for Soft Actuators

Recent Developments in Small-Scale Shape Memory Oxides

Phase transformation and incompatibility at grain boundaries in zirconia-based shape memory ceramics: a micromechanics-based simulation study

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