you teaching is extremely helpful as you are explaining things slowly and simply

OMG.....thank you so much for making me finally understand this. I will be recommending this to my friends if they have any problem with eutectic system.

My Chinese, barely any English speaking lecturer explained this whole playlist in one 40 min lecture... AND he's teaching at one of the biggest UK universities, which Im paying way too much for. This is how you teach. FREE. on KZread.

Very helpful video. Thank you for the clear handwriting and the different colors are a nice touch.

Extremely helpful lecture. Thank you so much!

Thank you from Canada!! Very well explained I appreciate it

I am from Bangladesh.. Glad to learning from you Sir💚

You r magic sir... Love u ... Hope I could meet u... Thanks for explanation

You are amzing sir, I didn't find explanation like this, thank you so much sir.

very nicely explained. thanks

Thank you so much Sir❤ you made it easy 😊

Thank you sir, nice explanation

Excellent teaching 👏

Sir, why liquidus and solidus curve get change?...... We have only alloy of sn and pb so, why two solid occur by solidify?

Thanks sir for helpful videos

Very nice explained

Fabulous😋✨

Sir how can seprate pb from sn by chemical method

thankyou sir really very useful

Thanks Sir ❤✌

Sir, can a reverse graph exist (with x axis being wt% of Pb)? Does the graph strictly have to be in this format?

@introductiontomaterialsscience

3 жыл бұрын

That is possible. Whether you draw the diagram with wt%Sn or Wt%Pb as your composition axis is your choice.

I wish I could make donations to support sir 🙏

Is there liquidus and solidus curve occur change only by 62% eutectic composition? What happens when we use other %?

@MusikMusk

4 ай бұрын

No, there's a liquidus-solidus curve change at different composition. Example at 50% eutectic composition which affects the eutectic temperature which may drop

Sir which engineering chemistry book should I refer as there are lots of books giving their own definition of eutectic system.

@introductiontomaterialsscience

4 жыл бұрын

In fact, there is no confusion regarding the definition of the eutectic. The definition given here is correct. If you have come across an alternative definition please let me know.

Will there be a eutectic point in an isomorphous system. Just to clarify

@rajeshprasad101

5 жыл бұрын

No, isomorphous system does not have any invariant reaction.

made it look very easy...

It is type 2 or type 3 diagram l...?

Sir, why the Eutectic horizontal line is not called as isomorphous line? ( as this line even defines at one temperature at 183 C ).

@rajeshprasad101

4 жыл бұрын

It is an isothermal line. Since the line is associated with the eutectic reaction it is called a eutectic horizontal. We could have called it 'eutectic isothermal', but it is not standard.

@raghavadutt1483

4 жыл бұрын

Thank you ,sir.

Nice hand writing sir

Sir, please explain us why Pb-Sn alloy shows different phase diagram?Why there occurs a different alpha n beta solids?

@annisahayyaarundati25

Жыл бұрын

because Pb and Sn have different crystal structure. Different crystal structure didn't allow complete solid solution. So, both alpha and beta has solubility limit represent as the solvus line. Isomorphous diagram, like we see from Cu-Sn, is only for components with same crystal structure, so there's complete solid solution.

Sir I really need theory of this topic eutectic system...can you help me 🙏🙏

gyanganga

Sir Is 100% soluility possible in Sn + Pb.. is it possible to draw phase diagrams if the components are not 100% soluble

@introductiontomaterialsscience

3 жыл бұрын

One requirement of 100% solubility in a solid state is that the two elements should have the crystal structure. This is not satisfied in this case as Pb is based on FCC lattice whereas Sn is based on BCT lattice. The phase diagram is still possible. The solvus lines will show limited solubility.

Sir bita hai kya?

sir why you didn't explain what is solvus line?

thankyou so much sir

👍👍👍👍👍👍

sir why eutectic composition has lowest melting point?

@rajeshprasad101

4 жыл бұрын

Like all 'Why' questions this one is difficult to answer. We just accept the phase diagrams as experimentally determined diagrams. Of course, since they are equilibrium diagrams, they represent the phases or mixtures of phases in thermodynamic equilibrium. So one can say that we have these phases because they result in the minimum free energy of the system. But then the question remains why the particular combination of phases have minimum free energy? Difficult to answer!

@manojvelishala8633

4 жыл бұрын

@@rajeshprasad101 thank you sir

@mohitjoshi9629

3 жыл бұрын

@@rajeshprasad101 sir aap to shayar bhi ho 😅🙏🙏 dhanya ho gurudev 🙏🙏

Isn't eutectic horizontal also a solidus line?

@rajeshprasadlectures

2 жыл бұрын

No. By definition, a solidus line separates a single phase solid region from a two phase solid+liquid region. This is not true for the eutectic horizontal.

Please also mention, how the graph came. With an proper explanation. We can memories the graph, but we also need to understand how it came.

@harshitjain5335

3 жыл бұрын

I think the graph comes from experiments

@rishichaudhary7966

9 ай бұрын

​@@harshitjain5335bhaiya are you from Baran Rajasthan

@harshitjain5335

9 ай бұрын

@@rishichaudhary7966 yes

Hi sir. What is the difference between alfa and beta alloy. If alfa is of one crystal structure and beta is of different crystal structure how can both alfa and beta exist as a single crystal. what is the actual difference between alfa and beta sir?? Surface defects - Can we say that alfa and beta in lead tin eutectic alloy at low temperature forms a heterogeneous surface defect. assuming alfa is of one crystal structure and beta is of different crystal structure?

@introductiontomaterialsscience

4 жыл бұрын

Alpha and beta have different crystal structures and different compositions. In sample both can be present but they occupy different volume elements of the sample. They meet at a surface which we call the the apha/beta phase boundary.

@harikrishnan3112

4 жыл бұрын

@@introductiontomaterialsscience Thank you sir. Since this is a substitutonal solid solution of 100% solubility how can we have different crystal structure. if it is a interstitial solid solution like we can have two different solid structure like alfa + Fe3C in Iron carbon diagram.

🙏🥺

13:56

sir why the horizontal line is at 183 degrees

@introductiontomaterialsscience

3 жыл бұрын

I can't really answer this question. I will face the same difficulty if one asked why does Pb melts at 327 degree C.