A unified, fundamental and quantitative resource. The result of 5 years of investigation from
researchers around the world
New data from a range of new techniques, including synchrotron radiation X-ray topography provide
safer and surer methods of identifying deformation mechanisms
Informing the future direction of research in intermediate and
high temperature processes by providing original treatment of dislocation climb
DESCRIPTION:
Thermally Activated
Mechanisms in Crystal Plasticity is a unified, quantitative and fundamental resource for material scientists investigating the strength
of metallic materials of various structures at extreme temperatures. Crystal plasticity is usually controlled by a limited number of
elementary dislocation mechanisms, even in complex structures. Those which determine dislocation mobility and how it changes under the
influence of stress and temperature are of key importance for understanding and predicting the strength of materials. The authors describe
in a consistent way a variety of thermally activated microscopic mechanisms of dislocation mobility in a range of crystals. The principles
of the mechanisms and equations of dislocation motion are revisited and new ones are proposed. These describe mostly friction forces
on dislocations such as the lattice resistance to glide or those due to sessile cores, as well as dislocation cross-slip and climb. They
are critically assessed by comparison with the best available experimental results of microstructural characterization, in situ straining
experiments under an electron or a synchrotron beam, as well as accurate transient mechanical tests such as stress relaxation experiments.
Some recent attempts at atomistic modeling of dislocation cores under stress and temperature are also considered since they offer a complementary
description of core transformations and associated energy barriers.
In addition to offering guidance and assistance for further experimentation,
the book indicates new ways to extend the body of data in particular areas such as lattice resistance to glide.
Audience
For academic and industrial researchers in materials science.
Contents
Experimental Charecterization of Dislocation Mechanisms
Interactions Between Dislocations and Small-size Obstacles
Frictional Forces in Metals
Dislocation Cross-slip
Experimental Studies of Peierls-Naborro-Type Friction Forces
in Metals and Alloys
The Peierl-Nabarro Mechanisms in Covalent Crystals
Dislocations Climb
Dislocation
Multiplication
Exhaustion and Work Hardening
Mechanical Behaviour of some Ordered Intermetallic
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