Plastic Deformation of Nanocrystalline Materials

Plastic Deformation of Nanocrystalline Materials

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Product Details

ISBN-13: 9781138077898
Publisher: Taylor & Francis
Publication date: 09/01/2017
Pages: 334
Product dimensions: 6.12(w) x 9.25(h) x (d)

Table of Contents

Introduction

Stages 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 microrange
Problem 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 σ=f(ε) dependence
Basic pattern of strain hardening of nanocrystals
Effect 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 grains
Models 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 σ in a wide grain size range
The 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 type
Concentration 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 alloys
Effect 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

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