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Plastic deformation of nanostructured materials /

A. M. Glezer, E. V. Kozlov, N. A. Koneva, N. A. Popova, I. A. Kurzina.

Book Cover
Author: Glezer, A. M.
Other Names: Kozlov, Ė. V. | Koneva, N. A. | Popova, N. A., | Kurzina, I. A.
Vernacular: Machine generated contents note: 1. Stages of plastic deformation of poly4crystalline materials -- 1.1. Introduction. Description of the problem -- 1.2. Main stages of plastic deformation of polycrystals at the mesolevel -- 1.3. Determination of the plastic deformation stages in FCC metals and solid solutions -- 1.4. Some historical data for the determination of the stages II--IV of plastic deformation in polycrystalline materials -- 1.5. Individual stages of plastic deformation in the BCC metals and alloys -- 1.6. Storage of dislocations, internal stress fields and evolution of the dislocation structure -- 1.7. Evolution of the substructure --- the basics of the physics of stages in gliding of total dislocations -- 1.8. Transition to twinning and deformation martensitic transformation as an important factor of formation of stages of work hardening -- 1.9. Localisation of deformation --- another reason for the formation of new stages -- 1.10. Factors complicating the characteristics of the deformation stages in meso-polycrystals -- 1.11. Effect of the mesograin size on the individual stages of plastic deformation -- 1.12. Changes of the structure of the polycrystalline aggregate and the pattern of the deformation stages with a decrease of the average grain size -- 1.13. The main factors determining the stages of deformation and the value of the work hardening coefficient in the microrange -- 1.14. Problem of determination of the grain size at the microlevel -- 1.15. Identification of plastic deformation stages at the microlevel -- 1.16. The stress σ---strain ε dependence for copper polycrystals with different nanograin sizes -- 1.17. Relationships of work hardening of copper micropolycrystals with different grain sizes -- 1.18. Hardening mechanisms and special features of the individual stages of deformation of polycrystals with nanograins -- 1.19. Effect of different hardening mechanisms on the flow stress and the form of the σ = f(ε) dependence -- 1.20. Basic pattern of work hardening of nanocrystals -- 1.21. Effect of the grain size on the parameters of plastic deformation stages -- 2. The structure and mechanical properties of nanocrystals -- 2.1. Introduction -- 2.2. Classification of polycrystals on the basis of the grain size -- 2.3. Methods for producing ultrafine-grained and nanogram polycrystalline materials -- 2.4. The structure of polycrystalline materials -- 2.5. Triple junctions in grains -- 2.6. Models of polycrystalline grains at the meso- and microlevel -- 2.7. The structure of individual nanograins -- 2.8. Special features of the structure of the nanopolycrystalline aggregate as a consequence of high plastic strains -- 2.9. Dependence of the dislocation density on the grain size and the problem of fine grains without dislocations -- 2.10. Critical size ranges of the grains and areas with grains -- 2.11. The Hall---Petch relation and its parameter σ0 in a wide grain size range -- 2.12. The mechanisms of implementation of the Hall---Petch relation at the mesolevel -- 2.13. Dependence of coefficient k on the grain size in the Hall---Petch relation -- 2.14. Problem of the transition of coefficient k to negative value. The first critical grain size -- 2.5. Mechanisms of realisation of the Hall---Petch relation at the microlevel -- 2.16. Mechanisms providing contribution to the grain boundary sliding process -- 2.17. The number of dislocations in the shear zone and the stress, required for the formation of this zone -- 2.18. Contact stresses. Conventional and accommodation sliding -- 2.19. Conclusion -- 3. Main components of the dislocation structure and the role of the dimensional factor -- 3.1. Problem of classification of dislocation structure components -- 3.1.1. Components of the dislocation structure -- 3.1.2. Strain gradient, the density of geometrically necessary and excess dislocations -- 3.1.3. Grain size and the density of geometrically necessary dislocations -- 3.1.4. Methods of measuring the density of geometrically necessary dislocations -- 3.2. The scalar density of dislocations in dislocation fragments with different types of substructure -- 3.2.1. Dependence of the dislocation density on the grain size in ultrafine-grained polycrystals -- 3.2.2. Critical grain sizes -- 3.2.3. Geometrically necessary and statistically stored dislocations, the second and third critical grain sizes Comparison of the parameters of the micro- and mesolevel -- 3.3. Dependence of the scalar density of the dislocations on the size of the fragments with the network dislocation substructure in a martensitic steel -- 3.4. Dependence of dislocation density on the size of fragments with the cellular dislocation substructure in the martensitic steel -- 3.5. Effect of the size of the fragments of grains and on the density of defects in metallic materials -- 3.5.1. Similarity of the dimensional relationships in ultrafine-grained polycrystals of metals and steels with a fragmented structure -- 3.5.2. Dependence of the density of partial disclinations on the grain size -- 3.5.3. Particles of second phases, dislocations and boundaries of grains and fragments -- 3.5.4. Plastic deformation and nanoparticles of second phases in microcrystalline metals -- 3.5.5. Fragmented dislocation substructure in martensitic steels and second phase microparticles -- 3.5.6. Mechanisms of formation of second phase particles at the boundaries of elements of the microstructure -- 3.5.7. Stabilisation of the structure of microcrystals by second phase particles -- 3.6. The role of geometrically necessary dislocations in the formation of deformation substructures -- 3.7. Storage of geometrically necessary dislocations and scalar dislocation density. The role of boundaries of different type -- 3.8. Concentration dependence of the main parameters of the dislocation structure in the FCC solid solutions -- 3.9. Cellular substructure: dislocation density ρs and ρG and the cell size -- 4. Dislocation structure and internal stress fields -- 4.1. Introduction -- 4.2. Methods for measuring internal stresses -- 4.3. Structure of ultrafine-grained metals and alloys -- 4.4. Sources of internal stress fields in ultrafine-grained materials -- 4.5. Distribution of internal stresses in grains. The scheme of the grains of ultrafine-grained materials -- 4.6. Conclusions -- 5. Severe plastic deformation -- 5.1. Introduction -- 5.2. Terminology -- 5.3. Structural models -- 5.4. Energy principles of the mechanical effect on the solid -- 5.5. Low-temperature dynamic recrystallisation -- 5.6. Amorphisation and crystallisation during SPD -- 5.7. Effect of the divisibility and direction of deformation -- 5.8. The principle of cyclicity in severe plastic deformation -- 5.9. Conclusions -- 6. Effect of ion implantation on structural state, phase composition and the strength of modified metal surfaces -- 6.1. Introduction -- 6.2. Effect of ion implantation on the structure of titanium alloys -- 6.3. Distribution of implanted elements in the thickness of the implanted layer of titanium alloys -- 6.4. Effect of ion implantation on the phase composition of the surface layers of titanium alloys -- 6.5. Modification of the physical---mechanical properties of titanium alloys by the ion implantation conditions -- 7. Grain boundary engineering and superhigh strength of nanocrystals.
Published: Boca Raton, FL : CRC Press, Taylor & Francis Group, [2017]
Topics: Nanostructured materials - Plastic properties. | Deformations (Mechanics) | Nanocrystals - Synthesis.
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University of Illinois at Urbana-Champaign

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Location & Availability for: Plastic deformation of nanostructured ma