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Superplasticity and grain boundaries in ultrafine-grained materials /
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 a...
| Clasificación: | Libro Electrónico |
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| Autor principal: | |
| Otros Autores: | |
| Formato: | Electrónico eBook |
| Idioma: | Inglés |
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Oxford :
Published by Cambridge International Science Pub. in association with Woodhead Pub.,
2011.
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| Colección: | Woodhead Publishing in materials.
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| Temas: | |
| Acceso en línea: | Texto completo |
Tabla de Contenidos:
- 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.