Dislocations in Solids

Dislocations are lines of irregularity in the structure of a solid analogous to the bumps in a badly laid carpet. Like these bumps they can be easily moved, and they provide the most important mechanism by which the solid can be deformed.

Dislocations in Solids

Dislocations are lines of irregularity in the structure of a solid analogous to the bumps in a badly laid carpet. Like these bumps they can be easily moved, and they provide the most important mechanism by which the solid can be deformed. They also have a strong influence on crystal growth and on the electronic properties of semiconductors. · Influence of dislocations on piezoelectric behavior · New mechanisms for hardening in twinned crystals · Bringing theories of martensite transformation into agreement · Atomic scale motion of dislocations in electron microscopy · Dislocation patterns deduced from X-ray diffraction · Role of dislocations in friction · Dislocation motion in quasicrystals

Dislocations in Solids

New models for dislocation structure and motion are presented for nanocrystals, nucleation at grain boundaries, shocked crystals, interphase interfaces, quasicrystals, complex structures with non-planar dislocation cores, and colloidal ...

Dislocations in Solids

New models for dislocation structure and motion are presented for nanocrystals, nucleation at grain boundaries, shocked crystals, interphase interfaces, quasicrystals, complex structures with non-planar dislocation cores, and colloidal crystals. A review of experimentally established main features of the magnetoplastic effect with their physical interpretation explains many diverse results of this type. The model has many potential applications for forming processes influenced by magnetic fields. • Dislocation model for the magnetoplastic effect • New mechanism for dislocation nucleation and motion in nanocrystals • New models for the dislocation structure of interfaces between crystals with differing crystallographic structure • A unified view of dislocations in quasicrystals, with a new model for dislocation motion • A general model of dislocation behavior in crystals with non-planar dislocation cores • Dislocation properties at high velocities • Dislocations in colloidal crystals

Dislocations in Solids

This is the first volume to appear under the joint editorship of J.P. Hirth and F.R.N. Nabarro.

Dislocations in Solids

This is the first volume to appear under the joint editorship of J.P. Hirth and F.R.N. Nabarro. While Volume 11 concentrated on the single topic of dislocations and work hardening, the present volume spreads over the whole range of the study of dislocations from the application by Kléman and his colleagues of homotopy theory to classifying the line and point defects of mesomorphic phases to Chaudhri's account of the experimental observations of dislocations formed around indentations. Chapter 64, by Cai, Bulatove, Chang, Li and Yip, discusses the influence of the structure of the core of a dislocation on its mobility. The power of modern computation allows this topic to be treated from the first principles of electron theory, and with empirical potentials for more complicated problems. Advances in electron microscopy allow these theoretical predictions to be tested. In Chapter 65, Xu analyzes the emission of dislocations from the tip of a crack and its influence on the brittle to ductile transition. Again, the treatment is predominantly theoretical, but it is consistently related to the very practical example of alpha iron. In a dazzling interplay of experiment and abstract mathematics, Kléman, Lavrentovich and Nastishin analyze the line and point structural defects of the many mesomorphic phases which have become known in recent years. Chapter 67, by Coupeau, Girard and Rabier, is essentially experimental. It shows how the various modern techniques of scanning probe microscopy can be used to study dislocations and their interaction with the free surface. Chapter 68, by Mitchell and Heuer, considers the complex dislocations that can form in ceramic crystals on the basis of observations by transmission electron microscopy and presents mechanistic models for the motion of the dislocations in various temperature regimes. While the underlying aim of the study of dislocations in energetic crystals by Armstrong and Elban in Chapter 69 is to understand the role of dislocations in the process of detonation, it has the wider interest of studying dislocations in molecular crystals which are ``elastically soft, plastically hard, and brittle''. Chaudhri in Chapter 70 discusses the role of dislocations in indentation processes, largely on the basis of the elastic analysis by E.H. Yoffe. The special case of nanoindentations is treated only briefly.

Dislocations in Solids

F.C. Larché , Nucleation and precipitation on dislocations 135 15. P. Haasen , Solution hardening in f.c.c. metals 155 H. Suzuki , Solid solution hardening in body - centred cubic alloys 191 V. Gerold , Precipitation hardening 219 16.

Dislocations in Solids

This is the first volume to appear under the joint editorship of J.P. Hirth and F.R.N. Nabarro. While Volume 11 concentrated on the single topic of dislocations and work hardening, the present volume spreads over the whole range of the study of dislocations from the application by Kléman and his colleagues of homotopy theory to classifying the line and point defects of mesomorphic phases to Chaudhri's account of the experimental observations of dislocations formed around indentations. Chapter 64, by Cai, Bulatove, Chang, Li and Yip, discusses the influence of the structure of the core of a dislocation on its mobility. The power of modern computation allows this topic to be treated from the first principles of electron theory, and with empirical potentials for more complicated problems. Advances in electron microscopy allow these theoretical predictions to be tested. In Chapter 65, Xu analyzes the emission of dislocations from the tip of a crack and its influence on the brittle to ductile transition. Again, the treatment is predominantly theoretical, but it is consistently related to the very practical example of alpha iron. In a dazzling interplay of experiment and abstract mathematics, Kléman, Lavrentovich and Nastishin analyze the line and point structural defects of the many mesomorphic phases which have become known in recent years. Chapter 67, by Coupeau, Girard and Rabier, is essentially experimental. It shows how the various modern techniques of scanning probe microscopy can be used to study dislocations and their interaction with the free surface. Chapter 68, by Mitchell and Heuer, considers the complex dislocations that can form in ceramic crystals on the basis of observations by transmission electron microscopy and presents mechanistic models for the motion of the dislocations in various temperature regimes. While the underlying aim of the study of dislocations in energetic crystals by Armstrong and Elban in Chapter 69 is to understand the role of dislocations in the process of detonation, it has the wider interest of studying dislocations in molecular crystals which are ``elastically soft, plastically hard, and brittle''. Chaudhri in Chapter 70 discusses the role of dislocations in indentation processes, largely on the basis of the elastic analysis by E.H. Yoffe. The special case of nanoindentations is treated only briefly.

Dislocations in Solids

We propose that such dislocation segments are the two - level systems in amorphous solids . The density of two - level systems and the relaxation times of the systems are estimated . I. Introduction Zeller and Pohl [ 1 ] have discovered ...

Dislocations in Solids

This volume comprises the Proceedings of the Yamada Conference IX on Dislocations in Solids, held in August 1984 in Tokyo. The purpose of the conference was two-fold: firstly to evaluate the increasing data on basic properties of dislocations and their interaction with other types of defects in solids and, secondly, to increase understanding of the material properties brought about by dislocation-related phenomena. Metals and alloys, semi-conductors and ions crystals were discussed. One of the important points of contention was the electronic state at the core of dislocation. Another was the dislocation model of amorphous structure.

Dislocations in Solids

Dislocation gliding in a Ni–3at.% Al solid solution at 300 K under t 1⁄4 70 MPa. The dimensions of the computational cell are Lx 1⁄4 30 nm, Ly 1⁄4 43.12 nm, Lz 1⁄4 7.32nm. The visualisation shows Al atoms and atoms in the Shockley ...

Dislocations in Solids

Bacon and Osetsky present an atomistic model of dislocation-particle interactions in metal systems, including irradiated materials. This work is important in simulating actual behavior, removing earlier reliance on assumed mechanisms for dislocation motion. New mechanisms for dislocation generation under shock loading are presented by Meyers et al. These models provide a basis for understanding the constitutive behavior of shocked material. Saada and Dirras provide a new perspective on the Hall-Petch relation, with particular emphasis on nanocrystals. Of particular significance, deviations from the traditional stress proportional to the square-root of grain size relation are explained. Robertson et al consider a number of effects of hydrogen on plastic flow and provide a model that provides an explanation of the broad range of properties. . Flow stress of metal systems with particle hardening, including radiation effects New model for dislocation kinetics under shock loading Explanation of effects of nanoscale grain size on strength Mechanism of hydrogen embrittlement in metal alloys~

Dislocations in Solids Dislocations in crystals

Summary In the production of dislocation - free layers two different types of dislocations must be considered . In the first place substrate - inherited threading dislocations must be eliminated . This may be done by using dislocation ...

Dislocations in Solids  Dislocations in crystals


Dislocations in Solids

Rabier et al clarify the issue of glide-shuffle slip systems in diamond cubic and related III-V compounds. Metadislocations, discussed by Feuerbacher and Heggen, represent a new type of defect in multicomponent metal compounds and alloys.

Dislocations in Solids

New materials addressed for the first time include the chapters on minerals by Barber et al and the chapter on dislocations in colloidal crystals by Schall and Spaepen. Moriarty et al extend the first principles calculations of kink configurations in bcc metals to high pressures, including the use of flexible boundary conditions to model dilatational effects. Rabier et al clarify the issue of glide-shuffle slip systems in diamond cubic and related III-V compounds. Metadislocations, discussed by Feuerbacher and Heggen, represent a new type of defect in multicomponent metal compounds and alloys. Kink mechanisms for dislocation motion at high pressure in bcc metals Dislocation core structures identified in silicon at high stress Metadislocations, a new type of defect, identified and described Extension of dislocation concepts to complex minerals First observations of dislocations in colloidal crystals

Dislocations in Solids Applications and recent advances

This series offers a comprehensive review of the entire study of dislocations. It is the first in over a decade to effectively focus attention on the influence of dislocations on all physical and metallurgical properties.

Dislocations in Solids  Applications and recent advances

This series offers a comprehensive review of the entire study of dislocations. It is the first in over a decade to effectively focus attention on the influence of dislocations on all physical and metallurgical properties. Whereas, formerly, it was possible to assemble our entire knowledge of dislocations into a single volume, the current scope of knowledge has increased to such an extent as to make a series of books a matter of necessity.

Other Effects of Dislocations

This series offers a comprehensive review of the entire study of dislocations. It is the first in over a decade to effectively focus attention on the influence of dislocations on all physical and metallurgical properties.

Other Effects of Dislocations

This series offers a comprehensive review of the entire study of dislocations. It is the first in over a decade to effectively focus attention on the influence of dislocations on all physical and metallurgical properties. Whereas, formerly, it was possible to assemble our entire knowledge of dislocations into a single volume, the current scope of knowledge has increased to such an extent as to make a series of books a matter of necessity.

Dislocations in Solids

Dislocations in Solids


Dislocations in Solids

Cal lias, C. and Markenscoff, X., "The nonuniformly moving supersonic dislocation," Quart. Appl. Math. , Vol. 38 (1980), pp. ... Markenscoff, X. and Ni , L. , "Nonuniform motion of an edge dislocation in an anisotropic solid. I," Quart.

Dislocations in Solids


Dislocations in Solids

From the contents: Long-range internal stress, dislocation patterning and work-hardening in crystal plasticity (M.

Dislocations in Solids

From the contents: Long-range internal stress, dislocation patterning and work-hardening in crystal plasticity (M. Zaiser, A. Seeger). - Collective behaviour of dislocations in plasticity (L. P. Kubin, C. Fressengeas, G. Ananthakrishna). - Linear work-hardening and secondary slip in crystals (L. M. Brown). -Long-range internal stresses in deformed single-phase materials: the composite model and its consequences (H. Mughrabi, T. Ungar).

Dislocations in Solids

Dislocations in Solids


Dislocations in Solids Moving dislocations

The chapters in Volume 8 remind us that a knowledge of esoteric topics, such as interfacial dislocations and the detailed structure of the cores of dislocations in unusual crystal structures, has been essential in the development of ...

Dislocations in Solids  Moving dislocations

It was fashionable at one time to say that, while dislocations were pleasant playthings for physicists and could explain some long-established technological observations, their study did not contribute to the advance of technology and the economy. The chapters in Volume 8 remind us that a knowledge of esoteric topics, such as interfacial dislocations and the detailed structure of the cores of dislocations in unusual crystal structures, has been essential in the development of semiconductor devices and of superalloys.

Introduction to Dislocations

Mott, N. F. and Nabarro, F. R. N. (1948) Strength of Solids, p. 1, Phys. Soc. London. Nabarro, F. R. N. (1947) `Dislocations in a simple cubic lattice', Proc. Phys. Soc. 59, 256. Nabarro, F. R. N. (1967) The Theory of Crystal ...

Introduction to Dislocations

Introduction to Dislocations was first published in 1965 in a series aimed at undergraduate and postgraduate students in metallurgy and materials science and related disciplines. At the time, the subject was maturing and it was expected that 'dislocation concepts' would remain a core discipline for a very long time. As expected, the book has been, and remains, an important undergraduate text all over the world. A wider range of materials has emerged since 1965, most notably in the field of electronics and micro-engineering. The principles of dislocation theory still apply but some of the detail requires further treatment. This fourth edition provides an essential basis for an understanding of many of the physical and mechanical properties of crystalline solids. This new edition has been extensively revised and updated to reflect developments in the understanding of the subject, whilst retaining the clarity and comprehensibility of the previous editions.

Dislocations in Solids without special title

Dislocations in Solids 1996 ; ISBN 0-444-82370-0 135 48. J.H. Westbrook , Superalloys ( Ni - base ) and dislocations 1 49. Y.Q. Sun and P.M. Hazzledine , Geometry of dislocation glide in Ll2 y ' - phase 27 50. D. Caillard and A. Couret ...

Dislocations in Solids  without special title