8 Dislocation interactions

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Two edge dislocations have been put in, close to one another, in a crystal with no applied shear force. run and explain.

You may note also that the dislocations are attracted to the edges of the crystal as they get close to it. Why?

Now put in a pair of dislocations of opposite sign, separated by about six lattice constants. You can play the same games with screw dislocations.

Predict what will happen if you introduce one screw and one edge, which cross in the middle of the screen. Were you right?