Atomic Diffusion and Interdiffusion in Metals
Delve into the fascinating world of atomic diffusion with Professor Harry Bhadeshia in this comprehensive lecture series on metals and alloys. Explore concepts like steady-state and non-steady-state diffusion, Fick's laws, thermodynamics of diffusion, and more. Gain insights into structure-sensitive diffusion, uphill diffusion, and binary solutions. Visual aids and real-world examples enhance your understanding of this essential topic in materials science and metallurgy.
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Presentation Transcript
Part IB Materials Science and Metallurgy Course A: Metals & Alloys Professor Harry Bhadeshia Lecture 2: Atomic Diffusion
Revision of Lecture 1 Steady state diffusion Fick s first law Cylinder containing gas under pressure Atmosphere
Revision of Lecture 1 Non-steady state diffusion Fick s second law Constant concentration at surface, CS Average concentration far from surface, C0
Interdiffusion Structure sensitive diffusion Thermodynamics of diffusion Uphill diffusion
pure aluminium Al-7Si wt% Moreno D, Embury JD, SCRIPTA MATERIALIA 40 (7): 821-824 MAR 5 1999
Structure sensitive diffusion
Thermodynamics of diffusion Flux proportional to solute- concentration gradient? Flux proportional to solute-free energy gradient?
Binary A-B solution in which A is the solute
o B Gibbs free energy per mole o A A G{x} B A B x Composition
