Computational description of nanocrystalline deformation based on crystal plasticity

Fu, Hsueh-Hung; Benson, David J.; Meyers, Marc A.

doi:10.1016/j.actamat.2004.05.036

Cited by 94 publications

(57 citation statements)

References 48 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Fu et al [33,34] and Benson et al [35] proposed a mantle-core model of nanocrystalline materials, in which a monocrystalline core is surrounded by a grainboundary region mantle with a high work hardening rate. They calculated plastic flow as a function of grain size taking into account the dislocation accumulation rates in grainboundary regions and grain interiors.…”

Section: Multi-element Composite Models and Homogenizationmentioning

confidence: 99%

“…A series of homogenization based models of nanocrystalline materials taking into account various deformation mechanisms has been developed by Capolungo, Cherkaoui and their colleagues [33][34][35][36][37][38][39][40]. In [33], the authors employed the homogenization method to evaluate the grain size effect on the deformation of nanocrystalline materials, assuming elastic-perfect plastic behaviour of grain boundaryphase and elastic-viscoplastic behaviour of grain core phase.…”

Section: Multi-element Composite Models and Homogenizationmentioning

confidence: 99%

“…Also, the homogenization methods have been improved, from easiest rule-of-mixture [22], to more complex composite models, like Christensen and Lo self-consistent scheme [43], Mori-Tanaka and hierarchical models [33][34][35][36][37][38][39][40] or real structure models with experimentally determined lognormal grain size distribution [28,29].…”

Section: Multi-element Composite Models and Homogenizationmentioning

confidence: 99%

“…Among the constitutive laws used in some models, one can list the grain size dependent plasticity (for grain interior/GI) and amorphous glass model (GB) [21], anisotropic elasto-plastic models with different orientations (GI) and Voce-hardening law with high work hardening rate. Depending on the distance from the closest grain boundary (GB) [33,35], isotropic, linear hardening behaviour (GI) and isotropic power-law type rate dependent constitutive response (GB) [27], dislocation glide model (GI) and diffusional (Coble creep and Nabarro-Herring creep) deformation [22][23][24][25], unified viscoplastic constitutive law [6], elastic-viscoplastic behaviour and dislocation glide (GI) and elastic perfect plastic behaviour incorporating the model of grain boundary dislocation emission and penetration (GB) [33][34][35][36][37][38][39][40], crystal viscoplasticity with Hall Petch grain size dependence (GI) and isotropic viscoplasticity and Mohr-Coulomb pressure dependence (GB) [47] .…”

Section: Dislocation Mechanisms Of Deformation and Polycrystal Plastimentioning

confidence: 99%

See 3 more Smart Citations

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

Mishnaevsky

Левашов

2015

Computational Materials Science

View full text Add to dashboard Cite

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...

show abstract

Section: Multi-element Composite Models and Homogenizationmentioning

confidence: 99%

Section: Multi-element Composite Models and Homogenizationmentioning

confidence: 99%

Section: Multi-element Composite Models and Homogenizationmentioning

confidence: 99%

Section: Dislocation Mechanisms Of Deformation and Polycrystal Plastimentioning

confidence: 99%

See 2 more Smart Citations

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

Mishnaevsky

Левашов

2015

Computational Materials Science

View full text Add to dashboard Cite

show abstract

“…Using crystallographic elasto-viscoplastic Finite Element analysis, Fu et al [19,20] investigated different assumptions for the strain-hardening behavior of the bulk and the GBs, obtaining different predictions of the local fields and overall behavior, as a function of grain size. Even if in these calculations the GB thickness were overestimated (tens of nanometers) compared to the value of ~1nm suggested by Molecular Dynamics (MD) simulations [21], its importance resides in suggesting the way of dealing with the complex microstructure of nanocrystalline materials, i.e.…”

Section: -Introductionmentioning

confidence: 99%