Introduction to Diffusion in Materials Science
Автор: Taylor Sparks
Загружено: 2018-11-02
Просмотров: 3708
0:00 announcements and learning objectives
5:00 stress relaxation in polymers
14:26 how molecular weight and crystallinity affect mechanical properties in polymers
15:35 diffusion introduction, case hardening
17:02 brave soul who risks life and limb to demonstrate diffusion
20:01 how diffusion relates to the eutectic microstructure
21:24 diffusion couple and concentration profiles
24:27 atomistic interpretation of diffusion
29:17 atoms diffusing in a chemical potential gradient
33:50 flux in terms of a driving force and a constant of proportionality
35:04 different diffusion mechanisms. Vacancy vs interstitial
40:40 steady-state diffusion and Fick's first law
44:34 calculating diffusion coefficient for any species at any temperature using the pre-exponential D_0 and activation energy, Q_D, and how to solve for activation energy from a log plot of D vs 1/T.
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