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Contents
INTRODUCTION
1 STRUCTURAL SUPERPLASTICITY OF POLYCRYSTALLINE MATERIALS
1£®1£® Structural levels£¬ spatial scales and description levels
1£®2£® Structural superplasticity£º from the combination of mechanisms to cooperative grain boundaries sliding
1£®3£® Structural superplasticity£º from meso-description to macroeharacteristics
References

2 CHARACTERISTICS OF GRAIN BOUNDARY ENESEMBLES
2£®1£® Crystal geometry and structure of intercrystalline boundaries
2£®1£®1£® Methods for describing the structure of the grain boundaries
2£®1£®2£® Analytical representation of the basis of the coincident-site lattice for cubic lattices
2£®2£® Special grain boundaries in the monoclinic lattice
2£®3£® Description of the grain boundary misorientation distribution £¨GBMD£©
2£®4£® Computer model of a polycrystal£º 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£º calculation methods
3£®2£® Relationship between the grain boundary misorientation distribution and the ODF
3£®3£® Correlation orientation of adjacent grains£º 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 ODF
References

4 EXPERIMENTAL INVESTIGATIONS OF GRAIN BOUNDARY ENSEMBLES IN POLYCRYSTALS
4£®1£® Diffraction methods of measuring misorientation
4£®1£®1£® Methods of measuring the misorientation of two adjacent grains
4£®1£®2£® The experimental measurement error
4£®2£® Experimental spectra of the grain boundaries in FCC polycrystals
4£®3£® Orientation distribution function in Ni-Cr alloy£º experimental and modelling GBMDs
4£®3£®1£® Orientation distribution function in Ni-Cr alloy and stainless steels
4£®3£®2£® Modelling spectra of the misorientation of the grain boundaries in Ni-Cr alloy and AISI stainless steels£º comparison with the experimental results
4£®4£® Special features of the grain boundaries in the FCC materials with a high stacking fault energy
4£®4£®1£® Rolling and annealing texture of aluminium
4£®4£®2£® Grain boundary ensembles in aluminium£º experiments and modelling
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£º 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 POLYCRYSTALS
6£®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
7£®1£® Effect of grain boundaries on oxidation and diffusion processes in polycrystalline oxide films
7£®2£® High-resolution electron microscopy of zirconium oxide£º grain clusters£¬ surrounded only by special boundaries
7£®3£® Effect of the statistics of the grain boundaries on diffusion in zirconium oxide
7£®4£® Special features of oxidation kinetics under the effect of stresses at the metal/oxide boundary
7£®5£® Texture and spectrum of misorientation of the grain boundaries in an NiO film on £¨100£© and £¨111£© substrates£º modelling and experiments
References

8 MICROSTRUCTURE AND GRAIN BOUNDARY ENSEMBLES IN ULTRAFINE-GRAINED MATERIALS
8£®1£® Methods of producing ultrafine-grained and nanostructured materials by severe plastic deformation
8£®2£® Effect of the parameters of quasi-hydrostatic pressure on the microstructure and grain boundary ensembles in nickel
8£®3£® Spectrum of misorientation of grain boundaries in ultrafine-grained nickel
8£®4£® Advanced methods of automatic measurement of the grain boundary parameters
8£®5£® The misorientation distribution of the grain boundaries in ultrafine-grained nickel£º experiments and modelling
References

9 GRAIN BOUNDARY PROCESSES IN ULTRAFINE-GRAINED NICKEL AND NANONICKEL
9£®1£® Grain growth kinetics in ECAP specimens
9£®2£® Activation energy and stored enthalpy in ultrafine-grained nickel
9£®3£® Evolution of the microstructure and texture in HPT nickel in annealing
9£®4£® Superplasticity of nanocrystalline nickel
References

10 DURATION OF THE STABLE FLOW STAGE IN SUPER]PLASTIC DEFORMATION
10£®1£® Superplastic capacity and the rate sensitivity parameter
10£®2£® Description of thickness differences of a flat specimen in tensile deformation
10£®3£® Formation of thickness difference as a random process
10£®4£® Absorption condition and the equation for limiting strain
10£®5£® Some properties of limiting strain
References

11 DERIVATION OF CONSTITUTIVE EQUATIONS IN MULTICOMPONENT LOADING CONDITIONS
11£®1£® From the deformation mechanism to constitutive equations
11£®2£® Kinematics of polycrystalline continuum
11£®3£® Strain rate tensor determined by shear along the CGBS bands
11£®4£® Degenerate cases and variants of coaxiality of the tensors
References
CONCLUSION
INDEX