Editing Dislocation (section)

=== Movement ===
{{main article|Slip (materials science)|Dislocation creep}}

==== Glide ====
Dislocations can slip in planes containing both the dislocation line and the Burgers vector, the so called glide plane.<ref>{{cite book |last1=Grundmann |first1=Marius |title=The physics of semiconductors : an introduction including nanophysics and applications |date=2010 |publisher=Springer |isbn=978-3-642-13883-6 |page=87 |edition=2nd}}</ref> For a screw dislocation, the dislocation line and the Burgers vector are parallel, so the dislocation may slip in any plane containing the dislocation.  For an edge dislocation, the dislocation and the Burgers vector are perpendicular, so there is one plane in which the dislocation can slip.

==== Climb ====
''Dislocation climb'' is an alternative mechanism of dislocation motion that allows an edge dislocation to move out of its slip plane. The driving force for dislocation climb is the movement of vacancies through a crystal lattice.  If a vacancy moves next to the boundary of the extra half plane of atoms that forms an edge dislocation, the atom in the half plane closest to the vacancy can ''jump'' and fill the vacancy.  This atom shift ''moves'' the vacancy in line with the half plane of atoms, causing a shift, or positive climb, of the dislocation.  The process of a vacancy being absorbed at the boundary of a half plane of atoms, rather than created, is known as negative climb.  Since dislocation climb results from individual atoms ''jumping'' into vacancies, climb occurs in single atom diameter increments.

During positive climb, the crystal shrinks in the direction perpendicular to the extra half plane of atoms because atoms are being removed from the half plane.  Since negative climb involves an addition of atoms to the half plane, the crystal grows in the direction perpendicular to the half plane.  Therefore, compressive stress in the direction perpendicular to the half plane promotes positive climb, while tensile stress promotes negative climb.  This is one main difference between slip and climb, since slip is caused by only shear stress.

One additional difference between dislocation slip and climb is the temperature dependence.  Climb occurs much more rapidly at high temperatures than low temperatures due to an increase in vacancy motion.  Slip, on the other hand, has only a small dependence on temperature.

==== Dislocation avalanches ====
{{main article|Dislocation avalanches}}

Dislocation avalanches occur when multiple simultaneous movement of dislocations occur.

==== Dislocation Velocity ====
Dislocation velocity is largely dependent upon shear stress and temperature, and can often be fit using a power law function:<ref>{{Cite book|last=Soboyejo|first=Wole|title=Mechanical properties of engineered materials|date=2003|publisher=Marcel Dekker|isbn=0-8247-8900-8|chapter=7.3 Dislocation Velocity|oclc=300921090}}</ref>

::<math>v = A\tau^m</math>

where <math>A</math> is a material constant, <math>\tau</math> is the applied shear stress, <math>m</math> is a constant that decreases with increasing temperature. Increased shear stress will increase the dislocation velocity, while increased temperature will typically decrease the dislocation velocity. Greater phonon scattering at higher temperatures is hypothesized to be responsible for increased damping forces which slow the dislocation movement.