Toughening mechanisms in nacre-like alumina revealed by in-situ imaging of stress

Saad, Hassan; Douillard, Thierry; Malchère, Annie; Steyer, Philippe; Meille, Sylvain; Deville, Sylvain; Reynard, Bruno

doi:10.1016/j.jeurceramsoc.2022.07.040

Cited by 3 publications

(5 citation statements)

References 22 publications

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“…It should be kept in mind that these findings are based on the study of model that does not consider defects or imperfections in the material, e.g. platelet misalignment [50]. These imperfections in the microstructure also play a role, thus modifying the extent to which the platelet dimensions play a role in the composite reinforcement.…”

Section: Methodsmentioning

confidence: 99%

Anisotropic fracture in nacre-like alumina

Duminy

Henry

Adrien

et al. 2023

Theoretical and Applied Fracture Mechanics

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Section: Methodsmentioning

confidence: 99%

Anisotropic fracture in nacre-like alumina

Duminy

Henry

Adrien

et al. 2023

Theoretical and Applied Fracture Mechanics

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“…These hurdles to crack propagation are either bunches of platelet unevenness or greater-than-mean platelets concerning most of the platelets. Such microstructural divergencies are, therefore, crucial to inhibiting crack propagation in nacre-like geometries. , There are various computation models to predict fracture behavior, toughening mechanisms, and microstructural change during loadings like the cohesive finite-element method, MD simulation, Monte Carlo simulation, DEM, representative volume element, FEA, and trans-scale shear-lag model. − The nacre hierarchy was produced as a 3D brick and mortar model for both sheet and columnar and fractured evolute using the optical microscopic image and SEM to study the surface morphology of fabricated samples, as illustrated in Figure . It has been expansively studied that the glassy polymers’ failure process largely relies on shear banding or crazing (microscopic) or necking (macroscopic) flow, and it scatters the constrained stress via cavitation, bond rupture, viscoelastic deformation, crack growth, and crazing before catastrophic material failure.…”

Section: Resultsmentioning

confidence: 99%

“…Such microstructural divergencies are, therefore, crucial to inhibiting crack propagation in nacre-like geometries. 63 , 64 There are various computation models to predict fracture behavior, toughening mechanisms, and microstructural change during loadings like the cohesive finite-element method, MD simulation, Monte Carlo simulation, DEM, representative volume element, FEA, and trans-scale shear-lag model. 65 − 67 The nacre hierarchy was produced as a 3D brick and mortar model for both sheet and columnar and fractured evolute using the optical microscopic image and SEM to study the surface morphology of fabricated samples, as illustrated in Figure 6 .…”

Section: Resultsmentioning

confidence: 99%

3D-Printed Biomimetic Hierarchical Nacre Architecture: Fracture Behavior and Analysis

et al. 2023

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Nacreous architecture has a good combination of toughness and modulus, which can be mimicked at the micron to submicron level using 3D printing to resolve the demand in numerous applications such as automobile, aerospace, and protection equipment. The present study examines the fabrication of two nacre structures, a nacre columnar (NC) and a nacre sheet (NS), and a pristine structure via fused deposition modeling (FDM) and explores their mechanically superior stacking structure, mechanism of failure, crack propagation, and energy dissipation. The examination reveals that the nacre structure has significant mechanical properties compared to a neat sample. Additionally, NS has 112.098 J/m impact resistance (9.37% improvement), 803.415 MPa elastic modulus (11.23% improvement), and 1563 MPa flexural modulus (10.85% improvement), which are all higher than those of the NC arrangement.

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“…One reason for the limitation in the properties of conventionally sintered textured alumina is the lack of control over the grain interface. Typically, a weak grain interface is desirable to allow tortuous crack path and extrinsic toughening mechanisms 16,17 . Also, a weak but tough interfacial material would also combine the extrinsic toughening mechanisms with intrinsic toughening 10,18 .…”

Section: Introductionmentioning

confidence: 99%

“…Typically, a weak grain interface is desirable to allow tortuous crack path and extrinsic toughening mechanisms. 16,17 Also, a weak but tough interfacial material would also combine the extrinsic toughening mechanisms with intrinsic toughening. 10,18 To this aim, polymeric or metallic interfaces have been explored.…”

Section: Introductionmentioning

confidence: 99%

High entropy oxide as interfacial material for toughened textured alumina

Liu,

Ma,

Behera

et al. 2024

J Am Ceram Soc.

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Textured alumina ceramics with brick‐and‐mortar microstructures exhibit surprisingly high values of strength and toughness as compared to traditional ceramics. However, in full ceramic systems, pressure‐assisted sintering restricts their shaping potential, and the study of interfacial materials is still insufficient. Here, we fabricate textured alumina exhibiting elevated indentation fracture toughness using a high entropy oxide (HEO) (MgAlSiTiZr)O as the mortar. The HEO undergoes a single‐phase transformation at 1600°C, resulting in a crystallographic structure identical to that of ZrO2. Our HEO mortar is tough and has a high wetting behavior to alumina platelets used in the green body, which promotes densification via liquid phase sintering. Textured alumina ceramics with HEO mortar at concentrations varying from 0 to 90 wt% were fabricated using magnetically assisted slip casting and pressureless sintering through the templated grain growth process. A trade‐off between density and grain anisotropy led to the highest mechanical properties. Textured alumina with 10 wt% HEO exhibited over 95% relative density, an elastic modulus of 244 ± 29 GPa, a flexural strength of 329 ± 27 MPa, and an indentation fracture toughness of 6.80 ± 0.65 MPa∙m0.5, which is more than 1.9 times that of the usual polycrystalline alumina. Thanks to the mineral nature of HEO, the simplicity of the process, and the mechanical properties, the textured alumina with HEO mortar can be produced in complex shapes and could find applications in stringent environments.

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Toughening mechanisms in nacre-like alumina revealed by in-situ imaging of stress

Cited by 3 publications

References 22 publications

Anisotropic fracture in nacre-like alumina

Anisotropic fracture in nacre-like alumina

3D-Printed Biomimetic Hierarchical Nacre Architecture: Fracture Behavior and Analysis

High entropy oxide as interfacial material for toughened textured alumina

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