7 The Crystalline Solid—Dislocations
65
Fig. 7.9 Screw dislocation
according to E. Kröner [47,
48], visibly ending on the
surface of the crystal. The
line direction t of the
dislocation and its Burgers
vector b are parallel to each
other
compare H. Günther [31, 32]. In comparison to plastic deformations in the elastic
case, the atoms of a lattice return to their old positions, be they ideal or non-ideal
lattice positions when the force causing the elastic deformation is removed. This is
the first correction of our original description of the process of a plastic deformation.
For a quantitative description of the motion of dislocations, we wish to refer to the
appendix in Chap. 26.
The second correction starts with our idea that a dislocation line, which can
also be found in a bent form, if it is not just a pure screw dislocation moves as
a whole in one step whilst either keeping or changing its geometrical form. This
type of a dislocation motion takes place inside a crystal when large forces cause a
fast and strong plastic lattice deformation. Such global dislocation motions and its
relationship to elastic deformations is not our main concern. We will talk about this
in the appendix, in Chaps. 26 and 27. Instead, we will investigate the question, which
motions are possible for the single sectors relative to each other in a dislocation
line. The motion possibilities inside of a single dislocation line will be investigated
65
Fig. 7.9 Screw dislocation
according to E. Kröner [47,
48], visibly ending on the
surface of the crystal. The
line direction t of the
dislocation and its Burgers
vector b are parallel to each
other
compare H. Günther [31, 32]. In comparison to plastic deformations in the elastic
case, the atoms of a lattice return to their old positions, be they ideal or non-ideal
lattice positions when the force causing the elastic deformation is removed. This is
the first correction of our original description of the process of a plastic deformation.
For a quantitative description of the motion of dislocations, we wish to refer to the
appendix in Chap. 26.
The second correction starts with our idea that a dislocation line, which can
also be found in a bent form, if it is not just a pure screw dislocation moves as
a whole in one step whilst either keeping or changing its geometrical form. This
type of a dislocation motion takes place inside a crystal when large forces cause a
fast and strong plastic lattice deformation. Such global dislocation motions and its
relationship to elastic deformations is not our main concern. We will talk about this
in the appendix, in Chaps. 26 and 27. Instead, we will investigate the question, which
motions are possible for the single sectors relative to each other in a dislocation
line. The motion possibilities inside of a single dislocation line will be investigated