Diffusion in solid metals is the process by which atoms migrate within the metal's crystal structure, as they jump from one position to an adjacent position. As atoms diffuse through a metal they can rearrange themselves to form new grains, form new phases, or result in other microstructure changes.
In this video, Michael Pfeifer from Industrial Metallurgists, LLC www.imetlc.com explains about diffusion, the diffusion mechanism, factors that affect diffusion rate, and the importance of controlling atom motion during heat treating.
If you'd like to learn more about diffusion and other metallurgy fundamentals, see our online course Principles of Metallurgy https://www.imetllc.com/product/principles-of-metallurgy-course/
