| Introduction |
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ix | |
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1 Structural superplasticity of polycrystalline materials |
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1 | (19) |
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1.1 Structural levels, spatial scales and description levels |
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1 | (4) |
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1.2 Structural superplasticity: from the combination of mechanisms to cooperative grain boundaries sliding |
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5 | (9) |
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1.3 Structural superplasticity: from meso-description to macrocharacteristics |
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14 | (6) |
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18 | (2) |
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2 Characteristics of grain boundary enesembles |
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20 | (29) |
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2.1 Crystal geometry and structure of intercrystalline boundaries |
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20 | (12) |
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2.1.1 Methods for describing the structure of the grain boundaries |
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20 | (6) |
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2.1.2 Analytical representation of the basis of the coincident-site lattice for cubic lattices |
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26 | (6) |
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2.2 Special grain boundaries in the monoclinic lattice |
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32 | (5) |
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2.3 Description of the grain boundary misorientation distribution (GBMD) |
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37 | (5) |
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2.4 Computer model of a polycrystal: a calculation algorithm |
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42 | (7) |
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47 | (2) |
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3 Orientation-distributed parameters of the polycrystalline structure |
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49 | (26) |
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3.1 The distribution function of the grains with respect to crystallographic orientations: calculation methods |
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49 | (4) |
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3.2 Relationship between the grain boundary misorientation distribution and the ODF |
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53 | (6) |
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3.3 Correlation orientation of adjacent grains: the concept of the basis spectra of misorientation of the grain boundaries |
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59 | (6) |
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3.4 Modelling the misorientation spectra of the grain boundaries in the FCC crystals with modelling ODF |
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65 | (10) |
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74 | (1) |
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4 Experimental investigations of grain boundary ensembles in polycrystals |
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75 | (44) |
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4.1 Diffraction methods of measuring misorientation |
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75 | (14) |
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4.1.1 Methods of measuring the misorientation of two adjacent grains |
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75 | (5) |
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4.1.2 The experimental measurement error |
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80 | (9) |
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4.2 Experimental spectra of the grain boundaries in FCC polycrystals |
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89 | (4) |
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4.3 Orientation distribution function in Ni--Cr alloy: experimental and modelling GBMDs |
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93 | (11) |
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4.3.1 Orientation distribution function in Ni--Cr alloy and stainless steels |
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93 | (6) |
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4.3.2 Modelling spectra of the misorientation of the grain boundaries in Ni--Cr alloy and AISI stainless steels: comparison with the experimental results |
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99 | (5) |
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4.4 Special features of the grain boundaries in the FCC materials with a high stacking fault energy |
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104 | (15) |
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4.4.1 Rolling and annealing texture of aluminium |
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104 | (3) |
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4.4.2 Grain boundary ensembles in aluminium: experiments and modelling |
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107 | (10) |
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117 | (2) |
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5 Grain boundary sliding in metallic bi- and tricrystals |
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119 | (43) |
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5.1 Dislocation nature of grain boundary sliding (GBS) |
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119 | (6) |
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5.2 Formulation of the model of stimulated grain boundary sliding |
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125 | (7) |
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5.3 Formal solution and its analysis |
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132 | (4) |
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5.4 Special features of pure grain boundary sliding |
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136 | (4) |
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5.5 Local migration of the grain boundary as the mechanism of reorganisation of the triple junction: weak migration approximation |
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140 | (9) |
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5.6 Variance formulation of the system of equations for the shape of the boundary and pile-up density |
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149 | (6) |
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5.7 The power of pile-ups of grain boundary dislocations |
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155 | (7) |
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160 | (2) |
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6 Percolation mechanism of deformation processes in ultrafine-grained polycrystals |
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162 | (25) |
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6.1 Percolation mechanism of the formation of a band of cooperative grain boundary sliding |
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162 | (5) |
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6.2 Conditions of formation of CGBS bands as the condition of realisation of the superplastic deformation regime |
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167 | (3) |
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6.3 Shear rate along the CGBS band |
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170 | (2) |
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6.4 Kinetics of deformation in CGBS bands |
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172 | (4) |
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6.5 Comparison of the calculated values with the experimental results |
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176 | (11) |
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186 | (1) |
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7 Percolation processes in a network of grain boundaries in ultrafine-grained materials |
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187 | (37) |
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7.1 Effect of grain boundaries on oxidation and diffusion processes in polycrystalline oxide films |
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187 | (4) |
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7.2 High-resolution electron microscopy of zirconium oxide: grain clusters, surrounded only by special boundaries |
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191 | (5) |
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7.3 Effect of the statistics of the grain boundaries on diffusion in zirconium oxide |
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196 | (6) |
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7.4 Special features of oxidation kinetics under the effect of stresses at the metal/oxide boundary |
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202 | (6) |
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7.5 Texture and spectrum of misorientation of the grain boundaries in an NiO film on (100) and (111) substrates: modelling and experiments |
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208 | (16) |
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222 | (2) |
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8 Microstructure and grain boundary ensembles in ultrafine-grained materials |
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224 | (25) |
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8.1 Methods of producing ultrafine-grained and nanostructured materials by severe plastic deformation |
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224 | (7) |
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8.2 Effect of the parameters of quasi-hydrostatic pressure on the microstructure and grain boundary ensembles in nickel |
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231 | (5) |
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8.3 Spectrum of misorientation of grain boundaries in ultrafine-grained nickel |
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236 | (1) |
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8.4 Advanced methods of automatic measurement of the grain boundary parameters |
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237 | (2) |
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8.5 The misorientation distribution of the grain boundaries in ultrafine-grained nickel: experiments and modelling |
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239 | (10) |
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247 | (2) |
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9 Grain boundary processes in ultrafine-grained nickel and nanonickel |
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249 | (27) |
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9.1 Grain growth kinetics in ECAP specimens |
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250 | (7) |
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9.2 Activation energy and stored enthalpy in ultrafine-grained nickel |
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257 | (7) |
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9.3 Evolution of the microstructure and texture in HPT nickel in annealing |
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264 | (3) |
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9.4 Superplasticity of nanocrystalline nickel |
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267 | (9) |
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274 | (2) |
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10 Duration of the stable flow stage in superplastic deformation |
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276 | (17) |
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10.1 Superplastic capacity and the rate sensitivity parameter |
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276 | (3) |
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10.2 Description of thickness differences of a flat specimen in tensile deformation |
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279 | (1) |
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10.3 Formation of thickness difference as a random process |
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280 | (4) |
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10.4 Absorption condition and the equation for limiting strain |
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284 | (6) |
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10.5 Some properties of limiting strain |
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290 | (3) |
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292 | (1) |
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11 Derivation of constitutive equations in multicomponent loading conditions |
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293 | (16) |
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11.1 From the deformation mechanism to constitutive equations |
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293 | (3) |
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11.2 Kinematics of polycrystalline continuum |
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296 | (3) |
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11.3 Strain rate tensor determined by shear along the CGBS bands |
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299 | (5) |
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11.4 Degenerate cases and variants of coaxiality of the tensors |
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304 | (5) |
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307 | (2) |
| Conclusion |
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309 | (2) |
| Index |
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311 | |
