Dislocations and Plastic Deformation
https://www.youtube.com/watch?v=cpvTwYAUeA8

Edge Dislocations (Burgers Vector, Stress Fields, Dislocation motion)
https://www.youtube.com/watch?v=-t6btGjGKYU

Screw Dislocations
https://www.youtube.com/watch?v=TxJOP3hA6To