7.1 | MSE104 - Diffusion, Nucleation and Growth
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- Опубликовано: 2 авг 2024
- Lecture 7. Diffusion and homogenisation. Nucleation and growth of precipitates - the nucleation energy barrier.
Course webpage with notes: dyedavid.com/mse104
Lecturer: Dr David Dye.
Licence: Creative Commons
Department of Materials, Imperial College, London, UK
Im in my final semester of my program, and this is the first time I've ever received a good lecture on this. Your lectures are fantastic and your students are lucky to have you.
Amazing explanation, understood the concept clearly. Loved it!
This video saved my life thank you so much you're a great teacher!
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simply love listening to you...
A quick remark: in the Arrhenius expression of diffusivity D=Do*exp(-Q/RT), Do is not the diffusivity at the absolute 0, it is instead the maximum diffusivity that you obtain when temperature approaches an infinite value
you video saved my semester
may we please have some lectures , we really like the methodology used .....proudly NUST students
Thank you so much!
Thank u sir for making me clear🙏
thank u really helped
very good explanation...
you explained that so much better than my professor :(
In 28.18 and 28.27, Prof. Dye actually means to say w* goes up -- not down.
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is there a mistake in this video that the added strain energy should increase the W* rather than decrease?
Your lecture is so good. I want to study master degree with you
In 5.43, l_ave ~ sqrt(D*t)..... Isn't D that depends on the jump or frequency rate, and not t ?
W = + 4/3*pi*r³*delta_G_v+4*pi*r²*sigma, Delta_G_v = G_solid - G_liquid < 0 hence negative! Also r* = - 2*sigma/delta_G_v. W* is right, but only because you copied the right answer :D.
Why is gas constant here? There is nothing about gases but it appears in equations anyway.
Steel Making process
Actually, does not strain energy add to the total nucleus energy? Then this will make the stabilization of a nucleus even more difficult, yielding a larger critical radius (with the assumption that all the strain energy is accumulated in the nucleus). Thanks.
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