Strength of nanostructures

Andrievski, R.A.; Глезер, А. М.

doi:10.3367/ufne.0179.200904a.0337

Cited by 116 publications

(58 citation statements)

References 133 publications

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“…So, in nanocrystalline ceramics with narrow grain size distributions, cracks tend to propagate along GBs. For instance, TiN ceramics with nanoscale grains (specified by a size of 18 nm) exhibit an intergranular fracture [4]. At the same time, in the case of nanoceramics with bimodal nanostructures containing both nanoscale (with a size of around 80 nm) and microscale (with a size of around 2 µm) grains, cracks propagate along the boundaries of smaller grains and penetrate interior regions of larger grains [4].…”

Section: Fracture Processes In Nanoceramics: General Aspects and Key mentioning

confidence: 99%

“…Fracture processes in nanoceramics are crucially influenced by grain and interphase boundaries whose amounts are very large in these materials [1][2][3][4]. So, grain and interphase boundaries serve as preferable places for nanocrack nucleation and growth, because the atomic density is low, and interatomic bonds are weak at boundaries compared with the bulk phase.…”

Section: Fracture Processes In Nanoceramics: General Aspects and Key mentioning

confidence: 99%

“…Although high-strength nanoceramics are commonly brittle, there are experimental data indicative of enhanced fracture toughness exhibited by several special nanocrystalline ceramics at comparatively low homologous or moderate temperatures (e.g. reviews [1,2,4], book [3] and original papers [8][9][10][11][12][13]19]). These experimental data are logically explained within the concept that (i) conventional toughening micromechanisms (that dominate in microcrystalline-matrix ceramics) operate in specific, inherent to nanostructures, ways in nanocrystalline ceramics where they effectively hamper crack growth and (ii) new, special (inherent to nanocrystallinity) toughening micromechanisms come into play in nanocrystalline ceramics [30][31][32][33][34][35][36][37][38][39][40][41][42][43].…”

Section: Fracture Processes In Nanoceramics: General Aspects and Key mentioning

confidence: 99%

“…The ductile behaviour of materials is highly desired for a wide range of technologies. Nanoceramics are commonly brittle at room temperature [1][2][3][4], as with their coarse-grained counterparts. Brittle fracture dominates in ceramic materials, first of all, because lattice dislocation slip (the key deformation mechanism responsible for ductile behaviour exhibited by most metallic solids) is suppressed in ceramics at room temperature.…”

Section: Fracture Processes In Nanoceramics: General Aspects and Key mentioning

confidence: 99%

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Micromechanics of fracturing in nanoceramics

Ovid’ko

2015

Phil. Trans. R. Soc. A.

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An overview of key experimental data and theoretical representations on fracture processes in nanoceramics is presented. The focuses are placed on crack growth in nanoceramics and their toughening micromechanics.Conventional toughening micromechanisms are discussed which effectively operate in both microcrystalline-matrix ceramics containing nanoinclusions and nanocrystalline-matrix ceramics. Particular attention is devoted to description of special (new) toughening micromechanisms related to nanoscale deformation occurring near crack tips in nanocrystalline-matrix ceramics. In addition, a new strategy for pronounced improvement of fracture toughness of ceramic materials through fabrication of ceramic-graphene nanocomposites is considered. Toughening micromechanisms are discussed which operate in such nanocomposites containing graphene platelets and/or few-layer sheets.

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Section: Fracture Processes In Nanoceramics: General Aspects and Key mentioning

confidence: 99%

Section: Fracture Processes In Nanoceramics: General Aspects and Key mentioning

confidence: 99%

Section: Fracture Processes In Nanoceramics: General Aspects and Key mentioning

confidence: 99%

Section: Fracture Processes In Nanoceramics: General Aspects and Key mentioning

confidence: 99%

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Micromechanics of fracturing in nanoceramics

Ovid’ko

2015

Phil. Trans. R. Soc. A.

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“…The size factor begins to play a significant role and substantially increases the resistance of the material to plastic deformation when the transverse size of the single crystals D [1][2][3][4][5] and the sizes of grains d [6][7][8][9] or twin lamellas λ [10][11][12] become less than 1-10 μm.…”

Section: Introductionmentioning

confidence: 99%

Influence of the transverse size of samples with micro- and nano-grained structures on the yield and flow stresses

Malygin

2012

Phys. Solid State

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The effects of reduction in the strength and deviation from the Hall-Petch relationship under plastic deformation of specimens with micro and nano grained structures with decreasing size of their cross section have been considered theoretically. The analysis is based on the kinetic equation for the dislocation density, which takes into account that the surface of the specimen serves as both the source and the sink for dislocations, whereas the grain boundaries are barriers limiting the mean free path of dislocations. It has been found that, when the ratio of the transverse size of the specimen D to the grain size d becomes less than 3, in the dependence of the yield stress on the size of the specimen there appears a minimum as a result of the increase in the number of near surface grains that exhibit a weak resistance to plastic deformation due to the withdrawal of dislocations through the external surface of the fine dimensional specimen. The minimum of the strength in the range d < D < 3d is a consequence of the competition and nonlinear interaction of the size factors D and d.

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Dendritic Silica Particles with Center-Radial Pore Channels: Promising Platforms for Catalysis and Biomedical Applications

Qiao

2014

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273

166

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Dendritic silica micro-/nanoparticles with center-radial pore structures, a kind of newly created porous material, have attracted considerable attention owing to their unique open three-dimensional dendritic superstructures with large pore channels and highly accessible internal surface areas compared with conventional mesoporous silica nanoparticles (MSNs). They are very promising platforms for a variety of applications in catalysis and nanomedicine. In this review, their unique structural characteristics and properties are first analyzed, then novel and interesting synthesis methods associated with the possible formation mechanisms are summarized to provide material scientists some inspiration for the preparation of this kind of dendritic particles. Subsequently, a few examples of interesting applications are presented, mainly in catalysis, biomedicine, and other important fields such as for sacrificial templates and functional coatings. The review is concluded with an outlook on the prospects and challenges in terms of their controlled synthesis and potential applications.

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Strength of nanostructures

Cited by 116 publications

References 133 publications

Micromechanics of fracturing in nanoceramics

Micromechanics of fracturing in nanoceramics

Influence of the transverse size of samples with micro- and nano-grained structures on the yield and flow stresses

Dendritic Silica Particles with Center-Radial Pore Channels: Promising Platforms for Catalysis and Biomedical Applications

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