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- เผยแพร่เมื่อ 5 ส.ค. 2024
- Segment 3 of lecture 2. Using the lever rule to calculate phase fractions.
Course webpage with notes: dyedavid.com/mse104
Lecturer: Dr David Dye.
Licence: Creative Commons
Department of Materials, Imperial College, London, UK
I have an exam in 8 hours, and you explained this to me in 12minutes, what my teacher couldn't in 4 classes of half hours each.
Thanks a ton.
exam in 12 hours lmao
@@Robotose exam in 3 hours lmao
In the exam hall lmaooooooo
Found this video after exam lmaoooo
In 46 mins😭
Thank you for taking the time to do this informative video. I found it very helpful!
Loved how simple you made it at 11:20, no idea why lecturers can't explain stuff simply like that.
I think you did a really good explanation!! :) Thank you!
You have just saved me an assignment for tomorrow ;)
The explanation was very good , thanks for the help😁
I honor you with greatest Civilian award of my Country. _/\_
Ah, thanks, this video was a big help.
look forward to more of your content, David. you could make a series on metal forming, for instance
Awesome video! Thank you.
thanks v.clear explanation!
I'm here from the Kurzgesagt Discord challenge with the brass phase diagram, thanks! :D
Very Helpful! Thanks!
What about calculating the phase fractions for eutectic systems. I am guessing the vs + vl will not be 1, and the best way i can describe it is that vs and vl will turn out opposite...
thank you so much!! it is clear explanation!!
A LIFE SAVER !!!
Life saver. Thanks
another great video! thank you!! keep posting please.
Great pictorial explanation
Thanks !!
Ni mtlb paisa bhi kharch kiya apne toh padaya bhi Badiya ...
Thank you bhiya
exam in 4 hours, great!!
Thank you very much for this perfect explination!
I have a question though. When is asked: Give me the (T,t) diagram => Temperature,time using ''De fasenregel van Gibbs" (IDK in English, fase-rule of Gibbs perhaps...). How does the diagramlooks like then? During the 2fase part (melt+solid) I have: (Gibbs) V=1+2-2=1 So the temperature can variate. Is this correct? And during the 1-fase parts I have: V=1+2-1=2 ?? What does that mean? 2 Parameters that can variate... but which ones?
Thanks
see en.wikipedia.org/wiki/Phase_rule. Looks like an accurate description to me.
I have a question, let say am given mol% then am asked to find the liquidus temperature, solidus temperature and freezing range
convert the %mol to weight % using x(mass fraction)=(yi*Mi/sigma y*M)
How to calculate mass fraction sir..
good one
Great explanation but can you help me to derive the same in weight percentage??
Why must one use the opposite 'lengths'?
thats just the way the derivation works out.
Ig Here atomic vol% is dealt instead of atomic wt%
Greating form POLITO ITALY
how to find Compositions in liquid and solid
If you are in a two phase region, read across T to the phase boundaries. In a single phase region, then its the alloy composition.
do i need to use lever rule to determine the Compositions in liquid and solid
Super explanation sir thanks sir
epiphany in 10:20
This could be a very nice explanation. The only problem with it is that it is not true!
It is true for mass fractions / weight fractions BUT since the densities of solid & liquid are different (in general), the rule can't be applied to volume fractions...
You are correct, of course. That's why I am flaky as to whether I am calculating a volume, area, weight or mole (atom) fraction of phase - this point is made in the notes. In practice in metallurgy, we measure the area fraction using microscopy, very commonly. And we assume that this corresponds to the volume fraction and to the weight fraction we calculated using the phase diagram (which is usually in wt.%). This is the custom in the subject; don't let it worry you.
Yes, the formula is obviously rigorously untrue when used for volume fractions, but he seems to suggest in the video that he uses this quite often, leading me to believe that perhaps the error due to the difference in densities is quite small for common materials?
Cuidado con el signo.
IF EACH PERSON IS HIS OR HER WORLD...IN MULTIVERSE THEORY...SHOULD THEY BE PRESENT...AS I AM...IN SOMETHING...LETS CALL...LIVE PHASE FRACTIONS
U can't even understand phase rule and talking about multiverse and all shit😅