MATS 3011 Lecture Notes - Inta, Howaldtswerke-Deutsche Werft, Plast
Document Summary
Impurities (imagine large impurity sitting in path that prevents dislocation motion) Have other dislocations (remember movie where it got crowded and tangled) impurity atom inclusions dislocations. If pin dislocations and try to move it, can"t move too farlike rubber band effect. How to strengthen a material: grain boundaries, add impurities (let them diffuse into the materials, add dislocations (by cold-working) (can hammer or heat it to make it stronger) Put in red amt energy to get up, when you bring back down, gain blue amt energy Remainder energy (sliver) went into creating dislocations (maybe not allheat, sound, but some certainly went into making dislocation) Look @ material @ beginning and after deforming w/ electron microscope --> and see if made new dislocations. If bend top one a bit more, have blue. They touch each other on other side eventually. Remember burgers vectorsedge dislocation on top and bottomscrew dislocations on sides in opposite sense.
