1. The cause of rotation: Due to constraints, or boundary conditions imposed on the crystal. ll. The rule of rotation:

1. There have no two-phases area in diffusion area, every layer is single-phases 2. Phase's interface moves according to parabola law 3. Phase's width

6. 8 Diffusion Mechani sm Flick's' law in microscopic form 1. One dimensional diffusion. jump frequency period probability of atom jumping to nearest position

5. 8 The Stress Around a Dislocation 1. Screw dislocation: Displacement:

5. 19 Reaction between Dislocation Condition 1. Geometrical condition

(for one dimensional diffusion only 1. Infinite system 1. Formula

天津开放大学：《地基基础》课程教学资源（试卷习题）分章练习题及答案

I Atom movement in sol ids mechanical movement thermal vibration (short-range migration) Thermal motion diffusion(long-range migration)

Back stress exerted by obstacle on leading dislocation. (It is supposed to be a short-range-force.) nrbdx =tpbdx dx virtual displacement

By cottrell atmosphere model, we can explain the sharp yielding phenomenon