超细晶材料的晶界和超塑性 影印版2025|PDF|Epub|mobi|kindle电子书版本百度云盘下载

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1 STRUCTURAL SUPERPLASTICITY OF POLYCRYSTALLINE MATERIALS1

1.1．Structural levels,spatial scales and description levels1

1.2．Structural superplasticity:from the combination of mechanisms to cooperative grain boundaries sliding5

1.3．Structural superplasticity:from meso-description to nacrocharacteristics14

References18

2 CHARACTERISTICS OF GRAIN BOUNDARY ENESEMBLES20

2.1．Crystal geometry and structure of intercrystalline boundaries20

2.1.1．Methods for describing the structure of the grain boundaries20

2.1.2．Analytical representation of the basis of the coincident-site lattice for cubic lattices26

2.2．Special grain boundaries in the monoclinic lattice32

2.3．Description of the grain boundary misorientation distribution(GBMD)37

2.4．Computer model of a polycrystal:a calculation algorithm42

References47

3 ORIENTATION-DISTRIBUTED PARAMETERS OF THE POLYCRYSTALLINE STRUCTURE49

3.1．The distribution function of the grains with respect to crystallographic orientations:calculation methods49

3.2．Relationship between the grain boundary misorientation distribution and the ODF53

3.3．Correlation orientation of adjacent grains:the concept of the basis spectra of misorientation of the grain boundaries59

3.4．Modelling the misorientation spectra of the grain boundaries in the FCC crystals with modelling ODF65

References74

4 EXPERIMENTAL INVESTIGATIONS OF GRAIN BOUNDARY ENSEMBLES IN POLYCRYSTALS75

4.1．Diffraction methods of measuring misorientation75

4.1.1．Methods of measuring the misorientation of two adjacent grains75

4.1.2．The experimental measurement error80

4.2．Experimental spectra of the grain boundaries in FCC polycrystals89

4.3．Orientation distribution function in Ni-Cr alloy:experimental and modelling GBMDs93

4.3.1．Orientation distribution function in Ni-Cr alloy and stainless steels93

4.3.2．Modelling spectra of the misorientation of the grain boundaries in Ni-Cr alloy and AISI stainless steels:comparison with the experimental results99

4.4．Special features of the grain boundaries in the FCC materials with a high stacking fault energy104

4.4.1．Rolling and annealing texture of aluminium104

4.4.2．Grain boundary ensembles in aluminium:experiments and modelling107

References117

5 GRAIN BOUNDARY SLIDING IN METALLIC BI-AND TRICRYSTALS119

5.1．Dislocation nature of grain boundary sliding(GBS)119

5.2．Formulation of the model of stimulated grain boundary sliding125

5.3．Formal solution and its analysis132

5.4．Special features of pure grain boundary sliding136

5.5．Local migration of the grain boundary as the mechanism of reorganisation of the triple junction:weak migration approximation140

5.6．Variance formulation of the system of equations for the shape of the boundary and pile-up density149

5.7．The power of pile-ups of grain boundary dislocations155

References160

6 PERCOLATION MECHANISM OF DEFORMATION PROCESSES IN ULTRAFINE-GRAINED POLYCRYSTALS162

6.1．Percolation mechanism of the formation of a band of cooperative grain boundary sliding162

6.2．Conditions of formation of CGBS bands as the condition of realisation of the superplastic deformation regime167

6.3．Shear rate along the CGBS band170

6.4．Kinetics of deformation in CGBS bands172

6.5．Comparison of the calculated values with the experimental results176

References186

7 PERCOLATION PROCESSES IN A NETWORK OF GRAIN BOUNDARIES IN ULTRAFINE-GRAINED MATERIALS187

7.1．Effect of grain boundaries on oxidation and diffusion processes in polycrystalline oxide films187

7.2．High-resolution electron microscopy of zirconium oxide:grain clusters,surrounded only by special boundaries191

7.3．Effect of the statistics of the grain boundaries on diffusion in zirconium oxide196

7.4．Special features of oxidation kinetics under the effect of stresses at the metal/oxide boundary202

7.5．Texture and spectrum of misorientation of the grain boundaries in an NiO film on(100)and(111)substrates:modelling and experiments208

References222

8 MICROSTRUCTURE AND GRAIN BOUNDARY ENSEMBLES IN ULTRAFINE-GRAINED MATERIALS224

8.1．Methods of producing ultrafine-grained and nanostructured materials by severe plastic deformation224

8.2．Effect of the parameters of quasi-hydrostatic pressure on the microstructure and grain boundary ensembles in nickel231

8.3．Spectrum of misorientation of grain boundaries in ultrafine-grained nickel236

8.4．Advanced methods of automatic measurement of the grain boundary parameters237

8.5．The misorientation distribution of the grain boundaries in ultrafine-grained nickel:experiments and modelling239

References247

9 GRAIN BOUNDARY PROCESSES IN ULTRAFINE-GRAINED NICKEL AND NANONICKEL249

9.1．Grain growth kinetics in ECAP specimens250

9.2．Activation energy and stored enthalpy in ultrafine-grained nickel257

9.3．Evolution of the microstructure and texture in HPT nickel in annealing264

9.4．Superplasticity of nanocrystalline nickel267

References274

10 DURATION OF THE STABLE FLOW STAGE IN SUPERPLASTIC DEFORMATION276

10.1．Superplastic capacity and the rate sensitivity parameter276

10.2．Description of thickness differences of a flat specimen in tensile deformation279

10.3．Formation of thickness difference as a random process280

10.4．Absorption condition and the equation for limiting strain284

10.5．Some properties of limiting strain290

References292

11 DERIVATION OF CONSTITUTIVE EQUATIONS IN MULTICOMPONENT LOADING CONDITIONS293

11.1．From the deformation mechanism to constitutive equations293

11.2．Kinematics of polycrystalline continuum296

11.3．Strain rate tensor determined by shear along the CGBS bands299

11.4．Degenerate cases and variants of coaxiality of the tensors304

References307

CONCLUSION309

INDEX311