FEM modelling of the combined effect of grain boundaries and second phase particles on the flow stress of nanocrystalline metals

Dobosz, Romuald; Lewandowska, M.; Kurzydłowski, Krzysztof J.

doi:10.1016/j.commatsci.2011.09.029

Cited by 27 publications

(18 citation statements)

References 35 publications

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“…Numerous studies have been carried out to produce numerical microstructures using Voronoi tessellation [22,24,41]. It is well established that polycrystalline microstructures can be modelled using Voronoi tessellations.…”

Section: Introductionmentioning

confidence: 99%

Analysis of two-phase ceramic composites using micromechanical models

Alveen

McNamara

Carolan

et al. 2014

Computational Materials Science

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Micromechanical models of two-phase ceramic composites are created using a modified Voronoi tessellation approach. These representative Finite Volume (FV) microstructures are used to investigate the role of microstructure on fracture of advanced ceramics. An arbitrary crack propagation model using a cell-centred finite volume based method is implemented. In particular the effect of matrix content is examined. It is shown that the underlying microstructure significantly affects the local stress and strain distributions for a two-phase ceramic containing hard particles in a softer matrix. Simulation results indicate that an increase in the volume fraction of these hard grains leads to an increase in strength of the composite material. Furthermore, it is found that the homogeneity of the microstructure affects the overall strength.

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Section: Introductionmentioning

confidence: 99%

Analysis of two-phase ceramic composites using micromechanical models

Alveen

McNamara

Carolan

et al. 2014

Computational Materials Science

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show abstract

“…However, the prediction of fracture paths that are representative of real material failure require accurate microstructural models. It is well established that a Voronoi tessellation can be used to model polycrystalline microstructures for different types of materials [6][7][8][9]. Various authors have used Voronoi diagrams to investigate failure of brittle materials.…”

Section: Microstructural Modellingmentioning

confidence: 99%

The influence of microstructure on the fracture properties of polycrystalline cubic boron nitride

Alveen

McNamara

Carolan

et al. 2015

Computational Materials Science

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“…Using the approach developed in [29] (multigrain Voronoi based composite model), Dobosz et al [99] studied numerically the effect of second phase particles at grain boundaries. They concluded that the particles located at GBS may lead to the material strengthening, if the material is deformed by GBS mechanism; otherwise, their effect is negligible.…”

Section: Non-equilibrium Grain Boundaries and Gb Defects In Nanocrystmentioning

confidence: 99%

Micromechanical modelling of nanocrystalline and ultrafine grained metals: A short overview

Mishnaevsky

Левашов

2015

Computational Materials Science

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Abstract:An overview of micromechanical models of strength and deformation behaviour of nanostructured and ultrafine grained metallic materials is presented. Composite models of nanomaterials, polycrystal plasticity based models, grain boundary sliding, the effect of nonequilibrium grain boundaries and nanoscale properties are discussed and compared. The examples of incorporation of peculiar nanocrystalline effects (like large content of amorphous or semi-amorphous grain boundary phase, partial dislocation GB emission/glide/GB absorption based deformation mechanism, diffusion deformation, etc.) into continuum mechanical approach are given. The possibilities of using micromechanical models to explore the ways of the improving the properties of nanocrystalline materials by modifying their structures (e.g., dispersion strengthening, creating non-equilibrium grain boundaries, varying the grain size distributions and gradients) are discussed.Keywords: Micromechanics; Finite element modelling; Nanomaterials; Nanocrystalline materials IntroductionDuring recent decades, growing interest of scientific community has been attracted to the nanostructured materials. The expectations on nanostructuring as a way to enhance material performances and to improve competing materials properties are very high, and some of them have been delivered, indeed.The extraordinary properties of nanocrystalline and ultrafine grained metallic materials (i.e., materials with the grain sizes of the order of several to several hundred nanometers) include superductility at room temperature, high hardness and high strength 2 to hardness value (which might be 2…7 times higher than in coarse grained materials), lower elastic modulus, negative Hall-Petch slope, enhanced strain rate sensitivity and difference between tensile and compression response [1][2][3][4][5]. The yield strength of nanocrystalline materials can be up to 5…10 times higher than of coarse-grained materials [6]. Other peculiar effect of nanocrystalline materials are the deviation fromHall-Petch relation at ultrafine and nanoscale grain sizes (below 100 nm), which goes into negative Hall Petch slope at about 10 nm, as well as asymmetry of tensile and compressive behaviour and enhanced diffusion properties [7].In order to predict the service properties of the materials and to explore the potential and reserves of their improvement, computational models linking the macroscale (service) In this paper, we present an overview of micromechanical models of nanocrystalline and ultrafine grained materials, their mechanical behaviour, deformation and strength.Composite models, crystal plasticity based models, grain boundary sliding, the effect of non-equilibrium grain boundaries, etc. are reviewed. The main constraints and challenges in the considered models are discussed. Composite models of nanocrystalline metallic materialsThe main structural feature of nanocrystalline and ultrafine grained materials, apart from the small grain sizes, is the high relative volume of grain boundary surface pha...

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FEM modelling of the combined effect of grain boundaries and second phase particles on the flow stress of nanocrystalline metals

Cited by 27 publications

References 35 publications

Analysis of two-phase ceramic composites using micromechanical models

Analysis of two-phase ceramic composites using micromechanical models

The influence of microstructure on the fracture properties of polycrystalline cubic boron nitride

Micromechanical modelling of nanocrystalline and ultrafine grained metals: A short overview

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