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Superplasticity and grain boundaries in ultrafine-grained materials /

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Superplasticity and Grain Boundaries in Ultrafine-Grained Materials, Second Edition, provides cutting-edge modeling solutions surrounding the role of grain boundaries in processes such as grain boundary diffusion, relaxation and grain growth. In addition, the book's authors explore the formatio...

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Bibliographic Details
Main Authors: Zhilyaev, Alexander P., 1959-2020 (Author), Raab, Georgy (Author), Utyashev, Farid (Author)
Corporate Author: ScienceDirect (Online service)
Format: eBook
Language:English
Published: Duxford, United Kingdom ; Cambridge, MA : Woodhead Publishing, [2021]
Edition:Second edition.
Series:Woodhead Publishing in materials.
Subjects:
Grain boundaries.
Superplasticity.
Polycrystals > Plastic properties.
Limites de granulation.
Superplasticité.
Polycristaux > Plasticité.
Grain boundaries
Superplasticity
Electronic books.
Online Access:Connect to the full text of this electronic book
Table of Contents:
  • Intro
  • Superplasticity and Grain Boundaries in Ultrafine-Grained Materials
  • Copyright
  • Dedication
  • Contents
  • Preface to 2nd edition
  • Acknowledgments
  • Introduction
  • References
  • Section A: Advanced processing of ultrafine-grained and nanostructured materials
  • Chapter 1: Basics of nanostructure processing
  • 1.1. Microstructure evolution during severe plastic deformation
  • 1.1.1. Dislocation clusters
  • 1.1.2. Cells and subgrains
  • 1.1.3. Interaction of dislocations with boundaries
  • 1.1.4. Band structures
  • 1.1.5. Features of structure evolution at SPD
  • 1.2. Influence of materials type and deformation condition on grain refinement
  • 1.2.1. Influence of deformation conditions
  • 1.2.2. Temperature
  • 1.2.3. Strain
  • 1.2.4. Strain rate
  • 1.2.5. Quasi-hydrostatic pressure
  • 1.2.6. Deformation scheme
  • 1.2.7. Scale factor
  • 1.2.8. Complex influence of factors
  • 1.3. Thermostability of ultrafine-grained materials
  • 1.3.1. Deformation heating
  • References
  • Chapter 2: Influence of deformation mechanisms on grain refinement
  • 2.1. Kinetics of fragmentation and deformation mechanisms during SPD
  • 2.1.1. Deformation mechanisms
  • 2.1.2. Kinetic equation of fragmentation
  • 2.1.3. Kinetics of changes in deformation mechanisms
  • 2.2. Scale of fragments and shear bands
  • 2.2.1. Sizes of fragment blocks
  • 2.2.2. Minimum sizes of fragments blocks
  • 2.2.3. Sizes of fragment bands
  • 2.2.4. Distribution of bands over sizes
  • 2.2.5. Occurrence of turbulence
  • 2.2.6. Sizes of blocks and bands
  • 2.2.7. Banding in other deformation methods
  • 2.2.8. Rolling
  • 2.2.9. Tensile deformation
  • 2.3. Scale factor effect on grain refinement
  • 2.3.1. Connection of surface with defect formation
  • 2.3.2. Justification of the hypothesis
  • 2.3.3. Change in tensor density of dislocations
  • 2.3.4. Fragment sizes.
  • 2.4. Strain value and its distribution at SPD
  • 2.4.1. Accumulated strain
  • 2.4.2. Distribution of bands and strains
  • References
  • Chapter 3: Processing ultrafine-grained and nanostructured materials
  • 3.1. Severe and combined techniques of plastic structure formation
  • 3.1.1. High pressure torsion of thin disks
  • 3.1.1.1. Torsion schemes and parameters
  • 3.1.1.2. Stress-strain state
  • 3.1.1.3. Force parameters
  • 3.1.1.4. Effects of torsion and pressure
  • 3.1.1.5. Reduction in axial force
  • 3.1.1.6. Role of friction
  • 3.1.1.7. Structure evolution
  • 3.1.1.8. Materials subjected to grain refinement by the HPT technique
  • 3.1.2. Twist extrusion
  • 3.1.2.1. Kinematics of flow and strain
  • 3.1.2.2. Force parameters
  • 3.1.2.3. Defects of workpieces after twist extrusion
  • 3.1.3. Rotational shear deformation
  • 3.1.4. ``Running neck´´ method
  • 3.1.5. Drawing with torsion
  • 3.2. Development of ECAP
  • 3.2.1. Basics of ECAP and ECAP with backpressure
  • 3.2.1.1. Deformed state
  • 3.2.1.2. Structural state
  • 3.2.2. Conditions for ECAP
  • 3.2.2.1. Pressing route
  • 3.2.2.2. Pressing velocity and strain rate
  • 3.2.2.3. Pressing temperature
  • 3.2.2.4. Power characteristics of pressing
  • 3.2.3. ECAP modifications
  • 3.2.3.1. Backpressure pressing
  • 3.2.3.2. Multipass pressing
  • 3.2.3.3. Conform process
  • 3.2.4. Examples of ECAP
  • 3.2.4.1. Experimental pressing
  • 3.2.4.2. Tungsten
  • 3.2.4.3. VT6 alloy [21]
  • 3.3. Multidirectional forging
  • 3.3.1. Basics of MDF
  • 3.3.1.1. Strain and specific force of deformation
  • 3.3.2. MDF of metals
  • 3.3.2.1. FCC metals
  • 3.3.2.2. HCP metals
  • 3.3.2.3. Forging of titanium alloys
  • 3.3.2.4. Isothermal forging
  • 3.3.2.5. Forging with deformation temperature reduction
  • 3.3.2.6. Use of phase transformations
  • 3.3.2.7. Mechanical properties.
  • 3.3.2.8. Deformation of heat-resistant nickel-based alloys
  • 3.3.2.9. Mechanical properties
  • 3.3.3. Continuous close die forging
  • 3.3.4. Effect of the preannealing cycle on the microstructure after eight passes
  • 3.3.4.1. Characterization of the microstructure at maximum number of passes
  • 3.3.4.2. Evolution of the mechanical properties
  • References
  • Section B: Grain boundary ensembles in polycrystalline materials
  • Chapter 4: Characteristics of grain boundary ensembles
  • 4.1. Crystal geometry and structure of intercrystalline boundaries
  • 4.1.1. Methods for describing the structure of the grain boundaries
  • 4.1.2. Analytical representation of the basis of the coincident-site lattice for cubic lattices
  • 4.2. Special grain boundaries in the monoclinic lattice
  • 4.3. Description of the grain boundary misorientation distribution
  • 4.4. Computer model of a polycrystal: A calculation algorithm
  • References
  • Chapter 5: Orientation-distributed parameters of the polycrystalline structure
  • 5.1. The distribution function of the grains with respect to crystallographic orientations: Calculation methods
  • 5.2. Relationship between the grain boundary misorientation distribution and the ODF
  • 5.3. Correlation orientation of adjacent grains: The concept of the basis spectra of misorientation of the grain boundaries
  • 5.4. Modeling the misorientation spectra of the grain boundaries in the FCC crystals with modeling ODF
  • References
  • Chapter 6: Experimental investigations of grain boundary ensembles in polycrystals
  • 6.1. Diffraction methods of measuring misorientation
  • 6.2. Methods of measuring the misorientation of two adjacent grains
  • 6.3. The experimental measurement error
  • 6.4. Experimental spectra of the grain boundaries in FCC polycrystals.
  • 6.5. Orientation distribution function in Ni-Cr alloy: Experimental and modeling GBMDs
  • 6.5.1. Orientation distribution function in Ni-Cr alloy and stainless steels
  • 6.5.2. Modeling spectra of the misorientation of the grain boundaries in Ni-Cr alloy and AISI stainless steels: Compariso ...
  • 6.6. Special features of the grain boundaries in the FCC materials with a high stacking fault energy
  • 6.6.1. Rolling and annealing texture of aluminum
  • 6.6.2. Grain boundary ensembles in aluminum: Experiments and modeling
  • References
  • Section C: Microstructure and grain boundary ensembles in ultrafine-grained materials
  • Chapter 7: Effect of the parameters of quasihydrostatic pressure on the microstructure and grain boundary ensembles in ni ...
  • 7.1. Microhardness measurements
  • 7.2. Spectrum of misorientation of grain boundaries in ultrafine-grained nickel
  • 7.3. Advanced methods of automatic measurement of the grain boundary parameters
  • 7.4. The misorientation distribution of the grain boundaries in ultrafine-grained nickel: Experiments and modeling
  • References
  • Chapter 8: Grain boundary processes in ultrafine-grained nickel and nanonickel
  • 8.1. Grain growth kinetics in ECAP specimens
  • 8.2. Activation energy and stored enthalpy in ultrafine-grained nickel
  • 8.3. Evolution of the microstructure and texture in HPT nickel in annealing
  • 8.4. Superplasticity of nanocrystalline nickel
  • References
  • Section D: Theory of structural superplasticity of polycrystalline materials
  • Chapter 9: Structural superplasticity of polycrystalline materials
  • 9.1. Structural levels, spatial scales, and description levels
  • 9.2. Structural superplasticity: From the combination of mechanisms to cooperative grain boundaries sliding
  • 9.3. Structural superplasticity: From meso-description to macrocharacteristics
  • References.
  • Chapter 10: Grain boundary sliding in metallic bi- and tricrystals
  • 10.1. Dislocation nature of grain boundary sliding (GBS)
  • 10.2. Formulation of the model of stimulated grain boundary sliding
  • 10.3. Formal solution and its analysis
  • 10.4. Special features of pure grain boundary sliding
  • 10.5. Local migration of the grain boundary as the mechanism of reorganization of the triple junction: Weak migration app ...
  • 10.6. Variance formulation of the system of equations for the shape of the boundary and pile-up density
  • 10.7. The power of pile-ups of grain boundary dislocations
  • References
  • Chapter 11: Percolation mechanism of deformation processes in ultrafine-grained polycrystals
  • 11.1. Percolation mechanism of the formation of a band of cooperative grain boundary sliding
  • 11.2. Conditions of formation of CGBS bands as the condition of realization of the superplastic deformation regime
  • 11.3. Shear rate along the CGBS band
  • 11.4. Kinetics of deformation in CGBS bands
  • 11.5. Comparison of the calculated values with the experimental results
  • References
  • Chapter 12: Duration of the stable flow stage in superplastic deformation
  • 12.1. Superplastic capacity and the rate sensitivity parameter
  • 12.2. Description of thickness differences of a flat specimen in tensile deformation
  • 12.3. Formation of thickness difference as a random process
  • 12.4. Absorption condition and the equation for limiting strain
  • 12.5. Some properties of limiting strain
  • References
  • Chapter 13: Derivation of constitutive equations in multicomponent loading conditions
  • 13.1. From the deformation mechanism to constitutive equations
  • 13.2. Kinematics of polycrystalline continuum
  • 13.3. Strain rate tensor determined by shear along the CGBS bands
  • 13.4. Degenerate cases and variants of coaxiality of the tensors
  • References
  • Conclusion.