out of all the videos i've watched on eutectic phase diagrams this one is by far the most detailed, crystal clear explanation. thank you!

A eutectic is a reaction (in a binary, at a single composition and temperature) where a liquid transforms to two solid phases. A eutectoid is a transformation from one solid phase to two different sold phases.

@RaoulPathak

8 жыл бұрын

Thanks, this had me confused.

@debjyotiupadhyay1325

5 жыл бұрын

how the phase boundary of alpha or betta are formed?

Thank you so much teacher, being a mechanical engineer, I am struggling with the metallurgy section in my post graduate research. your lectures are like an aid box for me

Honestly, this was the best explanation of working with phase diagrams! Thank you Sir!

BEST EXPLNATION on youtube about Eutectic Solidification !! thank you sir !

Best video I’ve seen on this and I’ve been looking for hours! Great content

You just saved my exam, I have never put the effort in posting comments on youtube videos but thought this was worth it. Explained the clearest as possible

This is the most helpful video on the topic, thanks so much for posting/explaining.

Thanks for this, you have explained it well and it certainly is a lot easier to understand now look forward to watching the rest of your videos.

Thank You! So much clearer than my teacher!

Thank you for this clear lecture and detailed explanation!

Amazing video! Very well and clearly explained!

yessssssssssssssssssssssss this was perfect, they didn't teach us about near eutectic alloys in lectures, yet they gave tutorial questions about it.

This was a great video. It was very clearly explained, thank you!

Thank you very much. You explained these concepts very clearly...!!

You sir have gained massive respect. SALUTE!

.this guy knows his stuf .... u are excellent buddy keep loading more vidz

Thank you professor. You saved my semester

A wonderful review! Thank you. Charles A Berg

great video, very clear and concise

thank u for the excellent explaining, u helped me alot

very very good Video, clear and precise

So much better than my lecturer at sheffield!

Explained really well

Thank you professor for this excellent lecture. I learned in about 1.5 hours what my professor cannot teach or explain to me. I will totally look forward to watching more of your videos. 🤣

Very good explanation.

Clear explanation !

thanks boss, very good explanation

Thanks this has really helped,

Absolute legend!!!

great video!

Great talk!

Thanks for the clip David. Please could you give me the differences between the terms eutectic and eutectoid, I've been looking for some time but can only find the difference of the eutectoids producing two new solid phases from a single phase... Many thanks, Jamie

Thanks for the great video. i am actually sitting exams for this, but do not understand. Thanks for the explaination

Amazing!

wonderful ....thanks

Thank you so much!

It is very informative

Thank you so much

A really detailed and clear presentation, thank you for that one, I really like your style of presentation! Just one comment on the calculation, i.e. the amounts shown from minute 27 on: I think it would be even clearer, if your numbers fit the actual example. If I see it correctly, the fraction of primary alpha (V_alpha,P) should be much bigger (~70%), whereas the fraction of eutectic should be about 30%?

thank you !!! you help me a lot ! :)

thank you!

This is great

very helpful!

Thanks a lot!

Thank you.

THANK YOU

thank you for this vidio thank you very much

thank you

excellent thank you

Do you have a discussion regarding the solute distribution?

Thank u so so much

thank you...plz any one explain how to differ hypo & hyper eutectic.

For the Lead-Tin eutectic system alloy what is so special about 61.9wt% of tin which leads to lowest melting point and eutectic reaction? What happens to the microstructural level of alloy which causes the melting point of pure components to reduce with addition of other component?

Interesting ❤️

think you so much

Hi Proff, With my understating if C(alpha) = concentration of A by % and C(beta) = concentration of B by % which adds to 100%. At the Eutectic point, as the the concentration C(alpha) and C(beta) doesn't sums up-to 100% as they move extremes. Can you please explain on this.

thanks heaps

Hypo - below the eutectic point. Hyper - above. See, e.g. wiktionary under "hypo." In some ways, its a silly phrase because it depends which way you plot the phase diagram, which is customary really.

mention the condition that must be provide to obtain full solubility between two metals(who know the soli.)

thanks very much sir...my lecture cant explain that clearly.

thanks u man

Material Science lectures at Birmingham could learn a thing or two from you!

As the liquid cools you state that the grains are become more and more enriched with beta atoms but then as the solidus line we only have alpha grains. What has happened with the beta atoms??

@DavidDyeIC

9 жыл бұрын

We have phases alpha and beta - particular crystallographic arrangements. The phases are populated with atoms A and B. So, for a hypo eutectic alloy, then on initial cooling the first solid alpha phase to form is quite pure. As it grows, it rejects B atoms into the liquid, so the liquid becomes enriched in B. This means the liquid is now stable to a lower temperature. Then, we cool some more. Now, the equilibrium solubility of B in the alpha has increased, so the composition of B in alpha increases. This means its fraction can also increase (lever rule). But, its still rejecting B atoms into the liquid, which therefore continues to get richer... and so on.

@fouriejosh

9 жыл бұрын

David Dye Many thanks. I have a question that baffles me a bit. It states: Calculate the amount of eutectic at the end of solidification in an Al-51%wtZn alloy. It gives a hint that maximum solubility in solid is 82.2% and that I should use the scheil equation.Firstly I am familiar with the eutectic point but not with the 'amount of eutectic'. What do they mean? And would it be possible to assist with working out this problem. The phase diagram is a little more complex than the normal FeC one. Possible to do a webinar on this question?

thaaaaaank you!!!

You r perfect 😍

you are a god !!!!

is single phase alloy contains only one metal, i mean if we do controlled cooling and got the single phase alloy then why alloying is done in the first place. Does single phase alloy also contain some amount of other phase metal too??

@DavidDyeIC

7 жыл бұрын

It depends what you want to achieve. You might add Cr to a solid solution alloy to help develop a protective chromia film during high temperature oxidation. Cu in Monel-400 (a Ni alloy) is there for saltwaer corrosion resistance. Or you might alloy with interstitial O for solid solution strengthening (e.g. in Grade 4 CP Ti). Or you might want to lower the freezing point to make a braze or solder. There are lots of possibilities.

David, I think there is a mistake in your lever rule at 26.50. I don't think you can directly calculate the vol fraction of alpha in the eutectic for an off-eutectic case directly. What you have written is true for a eutectic composition case only. For an off-eutectic case, you need to first calculate the total alpha and subtract the primary alpha from it to find out the amount of alpha in the eutectic.

@DavidDyeIC

5 жыл бұрын

I don't think you are correct, sorry.

How many job opportunities for metallurgist are in your area? Seems like steel production and consumption declines everywere.

@DavidDyeIC

10 жыл бұрын

Generally, in all industries and in most countries, its hard to hire decent metallurgists. Materials Science is an R&D field, so maybe 50% of the people working in the field have PhDs. I.e. in a steel rolling mill, there will only be a couple of metallurgists (at most) - the production side is mostly done by mechanical engineers. But: there are so few metallurgists, like mining engineers, that there is enormous demand for those that there are. Also remember that the R&D money is where the problems and profitability are - so the tonnage of Ti isn't very big but it supports quite a thriving community of metallurgists, for example.

sehr gut from germany

What is eutectic? Show that the eutectic point is invariant?

great video. your camera person needs to sit still and keep the board in complete view.

Good news I've found this video; Bad news only 12 hours left before the exam

Thank you so much! you make my textbook look like a pile of rubbish

how do you spell intermixed lamelli?

@DavidDyeIC

7 жыл бұрын

intermixed lamellae. Lamella is the singular, its latin. :-(

Fantastic video and explanation!! However I keep getting distracted by the mouth breathing!! I know people do it subconsciously but I can't get past it. Great content though.

👍🏻

didnt expect that voice

كنت فين يا فيديو لما كلنا كنا بناخدوا "المتحان طبعا"

thanks a lot

That drawing looks like pickachu

very well explained ... thankyou