Combined crystal plasticity and grain boundary modeling of. The method is developed and implemented for both single grains and. Grain boundaries and crystalline plasticity iste download. Publishers pdf, also known as version of record includes final. On the consideration of interactions between dislocations and grain boundaries in crystalplasticity finite element modeling theory, experiments, and. Nov 21, 2011 this book explores the fundamental role of grain boundaries in the plasticity of crystalline materials, providing a multiscale approach to plasticity to facilitate understanding. European journal of mechanics asolids 27 2008 737763 distribution based model for the grain boundaries in polycrystalline plasticity j. Introduction grain boundaries and grain growth grain boundaries and creep. Grain boundaries and crystalline plasticity free ebook download.
Predictive microstructural modeling of grainboundary. Grain boundaries and crystalline plasticity iste by louisette priester 2011 english pdf. These boundaries are often the weak links that cause a material to be brittle and to fracture. Nanoindentation induced deformation near grain boundaries of corrosion resistant nickel alloys. Internal length scale and grain boundary yield strength in. In this study, we use the pfc model to investigate the deformation dynamics of various types of symmetric tilt grain boundaries of graphene under uniaxial tensile tests, particularly the phenomena of yield and plastic flow dominated by dislocation motion, which are missing in previous work.
Modeling elastoplastic behavior of polycrystalline grain. The effect of grain boundaries on mechanical behavior in polycrystalline ceramics m. The grainsize effect documented on figs 2 and 3 illustrates the role of grain boundaries as barriers to the dynamical propagation of dislocation avalanches, and arises from the total dislocation. Critical popin loads indicating the onset of incipient plasticity were lower within 1. The atoms in the grain boundary will not be in perfect crystalline arrangement. A crack on the grain boundary an analysis based on. Grain boundaries are regions of crystalline incompatibility during. A grain boundary is the interface between two grains, or crystallites, in a polycrystalline material. In metals and other crystalline materials the occurrence of plastic deformations at the microscale level is due to the motion of dislocations and the migration of grain boundaries on the microlevel.
Grain boundarymediated plasticity in nanocrystalline nickel. Computational and theoretical aspects of a grainboundary model. Studying the effect of grain boundaries in dislocation density based. The factors determining intrinsic plasticity or brittleness have no simple link with interatomic potentials, yet there is a correlation with the ratio of the elastic shear modulus to the bulk modulus b 14. Distribution based model for the grain boundaries in. The effect of grain boundaries on mechanical behavior in. Each side of these interface elements possess six nodes in a quadratic triangular arrangement. Accumulation of polar defect densities in the vicinity of the grain boundaries and triple lines, leading to longrange. Grain boundaries and crystalline plasticity by louisette. Apart from any fair dealing for the purposes of research or. Grain boundaries and crystalline plasticity edited by louisette priester. A threedimensional grain boundary formulation for small strains crystal plasticity is presented for the first time. Modeling of grain boundary transmission, emission, absorption and overall crystalline behavior in.
Effects of grain boundaries and dislocation density evolution. An analysis of the influence of grain size on the strength of fcc. Intrinsic plasticity or brittleness of metallic glasses. Effects of grain boundaries and dislocation density evolution on large strain deformation modes in fcc crystalline materials w. Aa strength, plasticity, fracture and fatigue behaviour controlled by interfaces and grain boundaries material processing and characterization bb. Introduction low temperature intergranular fatigue high temperature fatigue conclusion acknowledgements bibliography intergranular fatigue grain boundaries and crystalline plasticity wiley online library. Louisettepriester universityofparissud11 september2011. Both the homogeneous boundaries and the heterophase interfaces play important roles in crystalline plasticity as they often serve as obstacles for dislocation motion, as well as dislocation sourcessinks.
To understand this role requires a multiscale approach to plasticity. Mechanical behavior and damage processes of udimet 720li. The factors determining intrinsic plasticity or brittleness have no simple link with interatomic potentials, yet there is a correlation with the ratio of the elastic shear modulus to the bulk modulus b. It has been proposed 36 that gbmediated plasticity e. Yielding and jerky plasticity of tilt grain boundaries in hightemperature graphene. Dislocation interactions mediated by grain boundaries. Grain boundary and triple junction energies in crystalline. Plasticity of materials for the subject plasticity of materials of the 3rd semester of the study branch of masters study, you have received a study package containing integrated lecture notes for combined study, including study instructions. Creep and high temperature plasticity grain boundaries and. Nanoindentation induced deformation near grain boundaries. The work hardening, equivalent to grain boundary effect, is realized by introducing a fictitious, preexisting, plastic strain grain boundary influence region mantle. Dislocation interactions mediated by grain boundaries the socalled hallpetch law, which relates the yield stress of a polycrystal to its average grain size, has recently been reformulated in the light of collective dislocation dynamics models 20 and its breakdown for nanometersized grains explained as. It starts with the atomic description of a grain boundary, moves on. The influence of the mismatch of the lattice orientation on the deformation and stress fields of a crack located on the grain boundary is studied by means of the finiteelement analysis taking account of finite deformatio and finite lattice rotation.
Machine learning determination of atomic dynamics at grain. In nanocrystalline solids, grain boundaries become a significant volume fraction of the material, with profound effects on such properties as diffusion and plasticity. Comparisons between homogeneous boundaries and heterophase. Mar 18, 2020 however, they can also be used to strengthen materials, because some grain boundaries efficiently block dislocation glide a fundamental mechanism of plasticity in metals that involves the. Rupert a, b, a department of mechanical and aerospace engineering, university of california, irvine, ca 92697, usa b department of chemical engineering and materials science, university of california, irvine, ca 92697, usa. With the use of fe parallel computations and with a classical approach to crystalline plasticity under small strains, it is possible to describe the intragranular heterogeneity in a. Author links open overlay panel wenquan zhou a jincheng. Full length article plasticity induced restructuring of a nanocrystalline grain boundary network jason f. Pdf the plastic behavior of crystalline materials is mainly controlled by the nucleation and motion of lattice dislocations. However, they can also be used to strengthen materials, because some grain boundaries efficiently block dislocation glide a fundamental mechanism of plasticity in metals that involves the. Yielding and jerky plasticity of tilt grain boundaries in.
A grain boundary is a general planar defect that separates regions of different crystalline orientation i. In this work, microcompression tests were carefully performed to. It starts with the atomic description of a grain boundary, moves on to the elemental interaction processes between dislocations and grain. This booklet explores the elemental position of grain barriers within the plasticity of crystalline fabrics, delivering a multiscale method of plasticity to facilitate knowing. Ebook grain boundaries as pdf download portable document. Evolution of the grain boundary network would open the door for grain boundary engineering of nanocrystalline materials, where the fraction of boundaries with special properties can. A crack on the grain boundary an analysis based on crystal. That high b favours brittleness and vice versa was.
Pdf a grain boundary formulation for crystal plasticity. At grain sizes below 100 nm, dislocations are emitted from grain boundaries and absorbed at interfaces on the other side of the grain 1. Phase transformations observed at the interfaces between. Commercially available finite element code is applied to solve the boundary value problem defined at the macroscopic scale. The constitutive model of crystal grains utilizes anisotropic elasticity and crystal plasticity. Grain boundaries and crystalline plasticity subject. The main purpose of this book is to put forward the fundamental role of grain boundaries in the plasticity of crystalline materials. Grain boundarydynamics 165 sylvie lartiguekorinekandclaude paulcarry 4. Grain boundaries triple junctions disclinations crystal defects abstract a disclinationbased framework is used to quantify the effect of rotational incompatibility on internal stresses and excess energies in crystalline media in the presence of symmetric tilt boundaries and triple junctions. Evolution of the grain boundary network would open the door for grain boundary engineering of nanocrystalline materials, where the fraction of boundaries with special properties can be altered with thermomechanical processing 16. Grain boundaries and crystalline plasticity free ebook. The importance of grain boundaries to the mechanical behavior of ceramics and. Furthermore, by comparing a gradient plasticity framework with interfacial yielding to the simulations it was found that, even though in the ddd simulations grain boundaries gbs were physically impenetrable to dislocations, on the continuum scale the assumption of plastically deformable gbs produces a better match of the ddd data than the. Grain boundaries and crystalline plasticity wiley online.
The formation of grain boundaries is accompanied by the rotation of individual structural elements. Those who downloaded this book also downloaded the following books. Pdf grain boundarymediated plasticity in nanocrystalline. Pdf a threedimensional grainboundary formulation for small strains crystal plasticity is presented for the first time. Breakdown of avalanche critical behaviour in polycrystalline. This book explores the fundamental role of grain boundaries in the plasticity of crystalline materials, providing a multiscale approach to plasticity to facilitate. Zikry journal of computeraided materials design volume 7, pages 55 62 2000cite this article. Most grain boundaries are preferred sites for the onset of corrosion and for the precipitation of new phases from the solid. This information was used at another scale to en force local slip transmission criteria at the grain boundaries. Grain boundaries are 2d defects in the crystal structure, and tend to decrease the electrical and thermal conductivity of the material.
The grain boundaries are discretized in space using socalled intrinsic cohesive zone interface elements, a common approach for realizing interface tractionseparation laws 102105. Grain sizedependent crystal plasticity constitutive. Influence of localized plasticity at grain boudaries patrick villechaise 1, jonathan cormier 1, thomas billot 1,2, jose mendez 1institut pprime upr cnrs 3346. Multiscale modelling of grain boundary plasticity technische. The text in this form does not involve the whole topic of plasticity. First, the pdf analysis indicates 1% bond length compression. A mesoscopic theory of dislocation and disclination fields. Download ebooks grain boundaries and crystalline plasticity pdf this booklet explores the elemental position of grain barriers within the plasticity of crystalline fabrics, delivering a multiscale method of plasticity to facilitate knowing. He has also taught courses on dislocation and plasticity and mechanical behavior of materials to ug and pg students at iitk. Effects of grain boundaries and dislocation density. Creep within the grains is represented using crystal plasticity for dislocation motion and recovery along with linear viscous. Grain boundaries are usually the result of uneven growth when the solid is. The grain size effect documented on figs 2 and 3 illustrates the role of grain boundaries as barriers to the dynamical propagation of dislocation avalanches, and arises from the total dislocation. Plasticityinduced restructuring of a nanocrystalline grain.
Gaophase field crystal modeling of grain boundary structures and growth in polycrystalline. This book explores the fundamental role of grain boundaries in the plasticity of crystalline materials, providing a multiscale approach to plasticity to facilitate understanding. Plasticityinduced restructuring of a nanocrystalline. Crystal plasticity modelling, which is based on the assumption of crystallographic slip and stretching and rotating of the crystal lattice when the crystalline material. In the limit of small crystallites, as the volume fraction of grain boundaries approaches 100%, the material ceases to have any crystalline character, and thus becomes an. Intergranular fatigue grain boundaries and crystalline. Providing an understanding of the influence of grain boundaries on crystalline plasticity has not yet been the subject of a dedicated book, although the subject constitutes a challenge for controlling material performances. Almost all real materials will undergo some permanent deformation, which remains after removal of load. Predictive microstructural modeling of grainboundary interactions and their effects on overall crystalline behavior.
Rupert a, b, a department of mechanical and aerospace engineering, university of california, irvine, ca 92697, usa. Creep and high temperature plasticity grain boundaries. The plane strain calculations for an fcc crystal subjected to mode i loading are performed on the basis of the crystalline plasticity described. The pfc method has the advantage of incorporating both microscopic crystalline structures and particle diffusive timescales, and thus being able to effectively model largescale material systems across an evolution time regime well beyond that of atomistic. Ebook grain boundaries as pdf download portable document format. This scheme is coupled to a dislocationdensity crystalline plasticity. However, they can also be used to strengthen materials, because some grain boundaries effi ciently block dislocation glide a fundamental mechanism of plasticity in metals that involves. While the traditional view of a dislocation is that it brings a small increment of plasticity, a single dislocation oving througha 15 nm grain m in al. Because crystalline materials show an increase in vibration frequencies with pressure away from phase transitions, the compression will cause. Grains and grain boundaries are modeled explicitly using voronoi tessellation.
175 1290 1074 1412 1541 438 160 238 13 1352 1139 868 435 590 419 1453 933 1638 1578 796 1295 1273 1661 401 553 490 1491 208 1222 650 1116 642 341 592 624 338 732 575 311