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 Kleman 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,
Kleman, 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 basisof
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.
General
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