Chapter 5_Part_5

Chapter 5_Part_5 - Diffusion: Role of the microstructure...

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21 MSE 2090: Introduction to Materials Science Chapter 5, Diffusion Diffusion: Role of the microstructure (I) Self-diffusion coefficients for Ag depend on the diffusion path. In general the diffusivity if greater through less restrictive structural regions – grain boundaries, dislocation cores, external surfaces.
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22 MSE 2090: Introduction to Materials Science Chapter 5, Diffusion Diffusion: Role of the microstructure (II) The plots below are from the computer simulation by T. Kwok, P. S. Ho, and S. Yip. Initial atomic positions are shown by the circles, trajectories of atoms are shown by lines. We can see the difference between atomic mobility in the bulk crystal and in the grain boundary region.
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23 MSE 2090: Introduction to Materials Science Chapter 5, Diffusion Example: Diffusion in nanocrystalline materials Arrhenius plots for 59 Fe diffusivities in nanocrystalline Fe and other alloys compared to the crystalline Fe (ferrite).
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Chapter 5_Part_5 - Diffusion: Role of the microstructure...

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