Grain boundary design of thin films: Using tilted brittle interfaces for multiple crack deflection toughening

Daniel, Rostislav; Meindlhumer, Michael; Baumegger, Walter; Zálešák, Jakub; Sartory, Bernhard; Burghammer, Manfred; Mitterer, Christian; Keckes, Jozef

doi:10.1016/j.actamat.2016.09.027

Cited by 89 publications

(17 citation statements)

References 30 publications

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“…It leads also to the increasing of interlayer interfaces, which block the propagation of cracks and dislocations, avoid the continuity of pinholes and pores [61]. Recent work by Daniel et al [62] on the beneficial impact of interface design on crack deflections have been reported in TiN coatings.…”

Section: Mechanical Propertiesmentioning

confidence: 99%

Multilayer design of CrN/MoN protective coatings for enhanced hardness and toughness

Postolnyi

Береснев

Abadias

et al. 2017

Journal of Alloys and Compounds

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We report on CrN/MoN multilayer coatings, their structure, elemental and phase composition, residual stresses, mechanical properties and their dependence on deposition conditions. The hardness and toughness were considered as main parameters for improvement of the protective properties of coatings. Multilayers with varying bilayer periods, ranging from 40 nm to 2.2 mm, were obtained by using cathodic arc physical vapour deposition (Arc-PVD) on stainless steel substrate. The elemental analysis was performed using wavelength-dispersive X-ray spectroscopy (WDS). The surface morphology and cross-sections were analysed with scanning electron microscopy (SEM). The X-ray diffraction (XRD) measurements, including grazing incidence X-ray diffraction (GIXRD), in-plane diffraction analysis and electron backscatter diffraction (EBSD), were used for microstructure characterisation. Mechanical properties of deposited films were studied by measuring hardness (H) and Young's modulus (E) with micro-indentation, H/E and H 3 /E 2 ratios were calculated. The dependences of internal structure and, hence, mechanical properties, on layer thickness of films have been found.

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Section: Mechanical Propertiesmentioning

confidence: 99%

Multilayer design of CrN/MoN protective coatings for enhanced hardness and toughness

Postolnyi

Береснев

Abadias

et al. 2017

Journal of Alloys and Compounds

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“…hierarchical architectures are shown by biological materials and biomimetic ceramics) where the mechanisms that enhance different properties simultaneously can originate from multiple length scales [2]. Each individual contribute results in composite properties that far exceed those of their constituents and their homogeneous mixtures [2,3]. For example, the micro-architectures of nacres -which can be considered as staggered layers of brittle bricks held together by weak and stretchy mortar -play a key role in providing toughness by various damaging processes including crack deflection, crack bridging, and debonding ahead of the crack tip [4].…”

Section: Introductionmentioning

confidence: 99%

Tough salami-inspired Cf/ZrB2 UHTCMCs produced by electrophoretic deposition

Galizia

Failla

Zoli

et al. 2018

Journal of the European Ceramic Society

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One of the biggest challenges of the materials science is the mutual exclusion of strength and toughness. This issue was minimized by mimicking the natural structural materials. To date, few efforts were done regarding materials that should be used in harsh environments. In this work we present novel continuous carbon fiber reinforced ultra-high-temperature ceramic matrix composites (UHTCMCs) for aerospace featuring optimized fiber/matrix interfaces and fibers distribution. The microstructures-produced by electrophoretic deposition of ZrB 2 on unidirectional carbon fibers followed by ZrB 2 infiltration and hot pressing-show a maximum flexural strength and fracture toughness of 330 MPa and 14 MPa m 1/2 , respectively. Fracture surfaces are investigated to understand the mechanisms that affect strength and toughness. The EPD technique allows the achievement of a peculiar salami-inspired architecture alternating strong and weak interfaces.

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“…As is well known, the mechanical properties of porous ceramics are intrinsically inferior to the dense ones and porous architecture are more susceptible to structural failure. The crack initiation, as occurs with overstressing, is able to be relaxed by the presence of 1D nanomaterials through nanofiber/nanowire pull‐out, bridging, and crack deflection . The benefit of high specific surface area is particularly obvious in porous architectures where physical/chemical adsorption occurs and has been instrumental in the recent emergence of porous ceramics .…”

Section: Introductionmentioning

confidence: 99%

Three‐dimensional (3D) flexible nanofibrous network knitting on hierarchical porous architecture

et al. 2018

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Hierarchical structured porous ceramics have attracted tremendous research interests because of their numerous excellent properties including robust mechanical strength and large surface area. In this work, silicon carbide (SiC)-based porous ceramics with three levels of pore hierarchy are fabricated from silicon particlestabilized foams and a subsequent one-step calcination after they were embedded with coke. Three-dimensional (3D) flexible nanofibrous network is adhered and wrapped on cell walls of porous ceramics, which is readily fine-tuned and tailored by the temperature to provide optimized pore structure. The resultant SiC-based porous ceramics present a density of 1.03 g/cm 3 at a porosity of 72% with a large quantity of hierarchical micro-and macropores. This hierarchical structure leads to robust compressive strength (23.52 MPa) and large surface area (64.32 m 2 /g). The fabrication method is straightforward and sought-after, providing a facile technical route for advanced hierarchical porous ceramics used in filtration and catalysis fields.flexible nanofibrous network, hierarchical porous architecture, mechanical properties, particle-stabilized foam, porous ceramics

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Grain boundary design of thin films: Using tilted brittle interfaces for multiple crack deflection toughening

Cited by 89 publications

References 30 publications

Multilayer design of CrN/MoN protective coatings for enhanced hardness and toughness

Multilayer design of CrN/MoN protective coatings for enhanced hardness and toughness

Tough salami-inspired Cf/ZrB2 UHTCMCs produced by electrophoretic deposition

Three‐dimensional (3D) flexible nanofibrous network knitting on hierarchical porous architecture

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