清华大学：《材料科学基础》课程教学资源（PPT课件讲稿）Chapter 5.6 Dislocation in Motion

85.6 Dis location in Mot ion 从 It stress stress A H Unit step K. Chen

§5.6 Dislocation in Motion

◆|. Edge dislocate i on 1. Slip(glide) Dislocation motion vs atom movement Direction:l⊥ Plane:l×b(1×w Dislocation motion vs, crystal movement. z→ crystal movement→v( dislocation motion

◆ Ⅰ.Edge dislocation 1. Slip (glide) ◆ Dislocation motion vs. atom movement. ◆ Direction: ◆ Plane: ◆ Dislocation motion vs. crystal movement. l v   ⊥ l b (// l v)       v    crystal movement  (dislocation motion)

I xv directs to the part of the crystal which moves along b τ→ crystal movement→v Q33 Ship plane Q Stip plure Direction of dis/ocation movement

directs to the part of the crystal which moves along . l v    b  v    crystal movement           

If the dislocation runs through the crystal from one side to the other, the relative displacement of the two parts of the crystal (on both sides of the moving plane) is b

If the dislocation runs through the crystal from one side to the other, the relative displacement of the two parts of the crystal (on both sides of the moving plane) is b