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Part IB Materials Science and Metallurgy Course A: Metals & Alloys

Part IB Materials Science and Metallurgy Course A: Metals & Alloys. Professor Harry Bhadeshia. Lecture 2: Atomic Diffusion. Revision of Lecture 1. Revision of Lecture 1. Steady state diffusion Fick’s first law. Cylinder containing gas under pressure. Atmosphere. Revision of Lecture 1.

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Part IB Materials Science and Metallurgy Course A: Metals & Alloys

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  1. Part IB Materials Science and Metallurgy Course A: Metals & Alloys Professor Harry Bhadeshia Lecture 2: Atomic Diffusion

  2. Revision of Lecture 1

  3. Revision of Lecture 1 Steady state diffusion Fick’s first law Cylinder containing gas under pressure Atmosphere

  4. Revision of Lecture 1 Non-steady state diffusion Fick’s second law Constant concentration at surface, CS Average concentration far from surface, C0

  5. Interdiffusion • Structure sensitive diffusion • Thermodynamics of diffusion • Uphill diffusion

  6. pure aluminium Al-7Si wt% Moreno D, Embury JD, SCRIPTA MATERIALIA 40 (7): 821-824 MAR 5 1999

  7. Structure sensitive diffusion

  8. Thermodynamics of diffusion Flux proportional to solute-concentration gradient? Flux proportional to solute-free energy gradient?

  9. Binary A-B solution in which A is the solute

  10. 1-x A m { } x B m { } o m B o m Gibbs free energy per mole A G{x} A B x Composition

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