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Plastic Deformation of Nanostructured Materials.

Author: A M Glezer
Publisher: London : CRC Press, 2017.
Edition/Format:   eBook : Document : EnglishView all editions and formats
Summary:
Plastic Deformation of Nanostructured Materials offers comprehensive analysis on the most important data and results in the field of materials strength and mechanics. This reference systematically examines the special features of the mechanical behavior and corresponding structural mechanisms of crystal structure defects with grain sizes that range from meso- to micro- levels.
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Genre/Form: Electronic books
Material Type: Document, Internet resource
Document Type: Internet Resource, Computer File
All Authors / Contributors: A M Glezer
ISBN: 1351620606 9781351620604
OCLC Number: 1001358862
Description: 1 online resource (330 pages)
Contents: IntroductionStages of plastic deformation of polycrystalline materials Introduction. Description of the problem Main stages of plastic deformation of polycrystals at the mesolevel Determination of the plastic deformation stages in FCC metals and solid solutions Some historical data for the determination of the stages II-IV of plastic deformation in polycrystalline materials Individual stages of plastic deformation in the BCC metals and alloys Build up of dislocations, internal stress fields and evolution of the dislocation structure Evolution of the substructure - the basics of the physics of stages in gliding of total dislocations Transition to twinning and deformation martensitic transformation as an important factor of formation of stages of strain hardening Localisation of deformation - another reasons for the formation of new stages Factors complicating the characteristics of the deformation Stages in mesopolycrystals Effect of the mesograin size on the individual stages of plastic deformation Changes of the structure of the polycrystalline aggregate and the pattern of the deformation stages with a decrease of the average grain size The main factors determining the stages of deformation and the value of the strain hardening coefficient in the microrangeProblem of determination of the grain size at the microlevel Identification of plastic deformation stages at the microlevel The stress strain & dependence for copper polycrystals with different nanograin sizes Relationships of strain hardening of copper micro-polycrystals with different grain sizes Hardening mechanisms and special features of the individual stages of deformation of the crystals with nanograins Effect of different hardening mechanisms on the flow stress and the form of the =f( ) dependenceBasic pattern of strain hardening of nanocrystalsEffect of the grain size on the parameters of plastic deformation stages The structure and mechanical properties of nanocrystals Introduction Classification of polycrystals on the basis of the grain size Methods for producing ultrafine-grained and nanograin polycrystalline materials The structure of polycrystalline materials Triple junctions in grainsModels of polycrystalline grains at the meso- and microlevel The structure of individual nanograins Special features of the structure of the nanopolycrystalline aggregate as a consequence of high plastic strains Dependence of the dislocation density on the grain size and the problem of fine grains without dislocations Critical size ranges of the grains and areas with grains The Hall-Petch relation and its parameter in a wide grain size rangeThe mechanisms of implementation of the Hall-Petch relation at the mesolevel Dependence of coefficient k on the grain size in the Hall-Petch relation Problem of the transition of coefficient k to negative value. The first critical grain size Mechanisms of realisation of the Hall-Petch relation at the microlevel Mechanisms providing contribution to the grain boundary sliding process The number of dislocations in the shear zone and the stress, required for the formation of this zone Contact stresses. Conventional and accommodation sliding Conclusion Main components of the dislocation structure and the role of the dimensional factor Problem of classification of dislocation structure components Components of the dislocation structure Strain gradient, the density of geometrically necessary and excess dislocations Grain size and the density of geometrically necessary dislocations Methods of measuring the density of geometrically necessary dislocations The scalar density of dislocations in dislocation fragments with different types of substructure Dependence of the scalar density of the dislocations on the size of the fragments with the network dislocation substructure in a martensitic steel Dependence of dislocation density on the size of fragments with the cellular dislocation substructure in the martensitic steel Effect of the size of the fragments in grains on the density of defects in metallic materials The role of geometrically necessary dislocations in the formation of deformation substructures Buildup of geometrically necessary dislocations and scalar dislocation density. The role of boundaries of different typeConcentration dependence of the main parameters of the dislocation structure in the FCC solid solutions Cellular substructure: discloaction density and the cell size Dislocation structure and internal stress fields Introduction Methods for measuring internal stresses Structure of ultrafine-grained metals and alloys Sources of internal stress fields in ultrafine-grained materials Distribution of internal stresses in grains. The scheme of the grains of ultrafine-grained materials Conclusions Severe plastic deformation Introduction Terminology Structural models Energy principles of the mechanical effect on the solid Low-temperature dynamic recrystallisation Amorphisation and crystallisation during SPD Effect of the divisibility and direction of deformation The principle of cyclicity in severe plastic deformation Conclusions Effect of ion implantation on structural state, phase composition and the strength of modified metal surfaces Introduction Effect of ion implantation on the structure of titanium alloys Distribution of implanted elements in the thickness of the implanted layer of titanium alloysEffect of ion implantation on the phase composition of the surface layers of titanium alloys Modification of the physical-mechanical properties of titanium lloys by the ion implantation conditions Grain boundary engineering and superhigh strength of nanocrystals

Abstract:

Plastic Deformation of Nanostructured Materials offers comprehensive analysis on the most important data and results in the field of materials strength and mechanics. This reference systematically examines the special features of the mechanical behavior and corresponding structural mechanisms of crystal structure defects with grain sizes that range from meso- to micro- levels.

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