Diffusion in steep concentration gradients and the growth of ferrite
Channel: bhadeshia123
Date: 2020-07-08

There are circumstances where the energy cost associated with the development of steep concentration profiles make it impossible to sustain diffusion. One such example is the theoretical mode for the growth of ferrite in steels, designated negligible-partitioning local equilibrium. It is shown that this cannot exist in reality and indeed, there is no experimental evidence to support the notion. The lecture begins with the foundations explained in an introductory manner, then goes on to develop Hilliard's equation for the free energy of a heterogeneous solution.
Presentation link: 
https://www.phase-trans.msm.cam.ac.uk/2020/IIT_Kharagpur_2020.pptx
Irreversible thermodynamics: 
https://youtu.be/1Sd8hcf_NZY
Teaching materials: 
https://www.phase-trans.msm.cam.ac.uk/teaching.html