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Superplasticity and grain boundaries in ultrafine-grained materials
Published by Cambridge International Science Pub. in association with Woodhead Pub.
1 online resource (xiv, 312 pages) : illustrations.
Superplasticity is a state in which solid crystalline materials, such as some fine-grained metals, are deformed well beyond their usual breaking point. The phenomenon is of importance in processes such as superplastic forming which allows the manufacture of complex, high-quality components in such areas as aerospace and biomedical engineering. Superplasticity and grain boundaries in ultrafine-grained materials discusses a number of problems associated with grain boundaries in metallic polycrystalline materials. The role of grain boundaries in processes such as grain boundary diffusion, relaxation and grain growth is investigated. The authors explore the formation and evolution of the microstructure, texture and ensembles of grain boundaries in materials produced by severe plastic deformation. Written by two leading experts in the field, Superplasticity and grain boundaries in ultrafine-grained materials significantly advances our understanding of this important phenomenon and will be an important reference work for metallurgists and those involved in superplastic forming processes. Discusses significant problems associated with grain boundaries in polycrystals incorporating structural superplasticity and grain boundary slidingAssesses the role of grain boundaries in processes such as grain boundary diffusion, relaxation and grain growthExplores the formation and evolution of the microstructure, texture and ensembles of grain boundaries in materials produced by severe plastic deformation.
Cover; Superplasticity and grain boundaries in ultrafine-grained materials; Copyright; Contents; Introduction; References; 1 STRUCTURAL SUPERPLASTICITY OF POLYCRYSTALLINE MATERIALS; 1.1. Structural levels, spatial scales and description levels; 1.2. Structural superplasticity: from the combination of mechanisms to cooperative grain boundaries sliding; 1.3. Structural superplasticity: from meso-description to macrocharacteristics; References; 2 CHARACTERISTICS OF GRAIN BOUNDARY ENSEMBLES; 2.1. Crystal geometry and structure of intercrystalline boundaries.
2.2. Special grain boundaries in the monoclinic lattice2.3. Description of the grain boundary misorientation distribution (GBMD); 2.4. Computer model of a polycrystal: a calculation algorithm; References; 3 ORIENTATION-DISTRIBUTED PARAMETERS OF THE POLYCRYSTALLINE STRUCTURE; 3.1. The distribution function of the grains with respect to crystallographic orientations: calculation methods; 3.2. Relationship between the grain boundary misorientation distribution and the ODF; 3.3. Correlation orientation of adjacent grains: the concept of the basis spectra of misorientation of the grain boundaries.
3.4. Modelling the misorientation spectra of the grain boundaries in the FCC crystals with modelling ODFReferences; 4 EXPERIMENTAL INVESTIGATIONS OF GRAIN BOUNDARY ENSEMBLES IN POLYCRYSTALS; 4.1. Diffraction methods of measuring misorientation; 4.2. Experimental spectra of the grain boundaries in FCC polycrystals; 4.3. Orientation distribution function in Ni-Cr alloy: experimental and modelling GBMDs; 4.4. Special features of the grain boundaries in the FCC materials with a high stacking fault energy; References; 5 GRAIN BOUNDARY SLIDING IN METALLIC BI-AND TRICRYSTALS.
5.1. Dislocation nature of grain boundary sliding (GBS)5.2. Formulation of the model of stimulated grain boundary sliding; 5.3. Formal solution and its analysis; 5.4. Special features of pure grain boundary sliding; 5.5. Local migration of the grain boundary as the mechanism of reorganisation of the triple junction: weak migration approximation; 5.6. Variance formulation of the system of equations for the shape of the boundary and pile-up density; 5.7. The power of pile-ups of grain boundary dislocations; References.
6 PERCOLATION MECHANISM OF DEFORMATION PROCESSES IN ULTRAFINE-GRAINED POLYCRYSTALS6.1. Percolation mechanism of the formation of a band of cooperative grain boundary sliding; 6.2. Conditions of formation of CGBS bands as the condition of realisation of the superplastic deformation regime; 6.3. Shear rate along the CGBS band; 6.4. Kinetics of deformation in CGBS bands; 6.5. Comparison of the calculated values with the experimental results; References; 7 PERCOLATION PROCESSES IN A NETWORK OF GRAIN BOUNDARIES IN ULTRAFINE-GRAINED MATERIALS.
Includes bibliographical references and index.
Oxford : Published by Cambridge International Science Pub. in association with Woodhead Pub., 2011