Lecture 15a Dislocations and Friends

Lecture 15a Dislocations and Friends - b) Dislocations...

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Dislocation Sources We are running out of time (3 weeks left+reading week), so I will cut some material on dislocations. One to talk about: dislocation sources. a) A dislocation loop can nucleate at a free surface to relieve stress. This is what commonly happens in thin film growth. If the growth is continuous the nucleation takes place at the outersurface; if it involves islands (Stranski-Krastanov or Volmer-Weber) it can also take place at the triple point between the substrate, coating and vacuum.
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Unformatted text preview: b) Dislocations pinned by other features, for instance a Frank-Rhead source. c) Stress concentrators d) Cross-slip (i.e. if a dislocation slips partially on one plane, partially on another). Show videos dislocation source stainless steel.avi source2.avi And for fun, a couple of videos on interactions of dislocations with stuff dislocations_two_al3sc_082004_12kX.avi sft interaction 300C.avi...
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Lecture 15a Dislocations and Friends - b) Dislocations...

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