High-intensity focused ultrasound

In materials science, a Lomer-Cottrell junction is a particular configuration of dislocations.

When two perfect dislocations along a slip plane, each perfect dislocation can split into two Shockley partial dislocations: a leading dislocation and a trailing dislocation. When the two leading Shockley partials combine, they form a separate dislocation with a burgers vector that is not in the slip plane. This is the Lomer-Cottrell dislocation. It is sessile and immobile in the slip plane, acting as a barrier against other dislocations in the plane. The trailing dislocations pile up behind the Lomer-Cottrell dislocation, and an ever greater force is required to push additional dislocations into the pile-up.

ex. FCC lattice along {111} slip planes

             |leading| |trailing|

$\frac{a}{2}[\text{0 1 1}]\to \frac{a}{6}[\text{1 1 2}]+\frac{a}{6}[\text{-1 2 1}]$

$\frac{a}{2}[\text{1 0 -1}]\to \frac{a}{6}[\text{1 1 -2}]+\frac{a}{6}[\text{2 -1 -1}]$

Combination of leading dislocations:

$\frac{a}{6}[\text{1 1 2}]+\frac{a}{6}[\text{1 1 -2}]\to \frac{a}{3}[\text{1 1 0}]$

The resulting dislocation is along the crystal face, which is not a slip plane in FCC at room temperature.

Lomer-Cottrell dislocation

References

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