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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
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Discrepancies between theory and practice in Deformation. 1. Morphology of the surface in deformation. 2. The great difference between theoretical and actual strength of single crystals (. >>)
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By cottrell atmosphere model, we can explain the sharp yielding phenomenon
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(for one dimensional diffusion only 1. Infinite system 1. Formula
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I Atom movement in sol ids mechanical movement thermal vibration (short-range migration) Thermal motion diffusion(long-range migration)
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5. 19 Reaction between Dislocation Condition 1. Geometrical condition
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Back stress exerted by obstacle on leading dislocation. (It is supposed to be a short-range-force.) nrbdx =tpbdx dx virtual displacement
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5.16 Dislocation in FCC crystals Perfect dislocation b =na, +nb. +nC
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5. 8 The Stress Around a Dislocation 1. Screw dislocation: Displacement:
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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
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