DIFFUSION

DIFFUSION - Diffusion Chapter 5 Mechanics of Diffusion...

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Unformatted text preview: Diffusion Chapter 5 Mechanics of Diffusion Primary method by which atoms mix Consider a drop of food coloring in a glass of water Where does Diffusion Occur? Primarily At Defects Point Defects Line Defects Edge Defects Through Interstitial Spaces Vacancy Diffusion Vacancies are holes in the matrix Vacancies are always moving An impurity can move into the vacancy Diffuse through the material Interstitial Diffusion There are holes between the atoms in the matrix If the atoms are small enough, they can diffuse through the interstitial holes Fast!! Other Mechanisms Grain Boundaries Surface Be sure to see the animations Activation Energy All the kinds of diffusion require a certain minimum energy to occur Called the activation energy The higher the activation energy, the harder it is for diffusion to occur Activation Energy The highest energy is for volume diffusion...
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DIFFUSION - Diffusion Chapter 5 Mechanics of Diffusion...

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