sir, you have shown that for 2 phase region we need only one degree of freedom but for particular temprature how we will come to know whether the mixture is hypereutectic or hypoeutectic. you have considered hypoeutectic mixture.
In the phase diagram, only pressure is fixed, temperature is one of the variables. So the phase rule in the form F=C-P+1 will be used. If you now wish to have a three phase equilibrium (P=3) in a binary system (C=2) gives F=0. Thus there is no degrees of freedom This means three phase equilibrium can be had only at fixed compositions of the phases and at a fixed temperature. These compositions and temperature correspond to eutectic horizontal.
@@introductiontomaterialsscience Sir, But the three phase equilibrium is ONE AND ONLY obtained (Crct me if I'm wrong) on the Te i.e 183 deg C(I mean it for Pb-Sn system).This means that Temp is fixed for the 3-phase equilibrium, Moreover the eutectic temperature is also fixed for any phase diagrams. Since, here we are considering our equilibrium at that Te temperature, then how it'll be considered as a variable?Kindly reply at your earliest convenience sir.
@@praveenr3767 We are initially not specifying the temperature. We are only asking for a three-phase (alpha+beta+L) equilibrium (P=3) in a two-component (Pb and Sn) system (C=2). . We have four variables available; compositions of the three phases and temperature. Now we find that (or thermodynamics dictates) that we can have these three phases in equilibrium only T=183 C and and Compositions of alpha, beta and L as 18, 62 and 97 wt% Sn respectively. Thus to have the three-phase equilibrium in this system, all the four variables have fixed values. Thus we can't vary any of these variables and still have the three phases in equilibrium. In other word there is no degrees of freedom (F=0).
Sir My doubt is in (L+@) region How can one doesn,t have different compositions at the same temperture? As T is a horizontal line we can traverse along it within the region.
As you traverse from one end of the tie-line to the other end, the overall alloy composition changes. And thus, by the lever rule, the proportion of the two phases (i.e., their relative amounts) also changes. But the compositions of the two phases do not change; they are given by the end points of the tie line, irrespective of the alloy composition between these two compositions.
@@introductiontomaterialsscience sir I have a question on phase composition..for instance in ni-cu alloy, if you get the ave. of @ phase and the liquid phase, won't the answer be the overall composition?..coz there's nothing that constitutes the alloy but the solid and liquid, but when I do that the answer is near but not exactly the same as the overall composition...
@@introductiontomaterialsscience sir I have a question on phase composition..for instance in ni-cu alloy, if you get the ave. of @ phase and the liquid phase, won't the answer be the overall composition?..coz there's nothing that constitutes the alloy but the solid and liquid, but when I do that the answer is near but not exactly the same as the overall composition...
@@jhedisavir8133 no, your answer is correct only when the α and L phases are 50 percentage each at the given state. Else if you have x amount of α and y amount of L, then you should multiply with this x and y respectively i.e. (x * α + y* L) gives you the actual composition of alloy.
Prof. I'm confuse of this question, help me out please. Steel is placed in aerated sea water with a neutral pH. Is corrosion of steel possible? Write down the redox reactions. Use Gibbs free energy to explain. (Assume valence of 2, F= 96500 C/mol, E°oxidation =0.447V, E°reduction= 0.820V)
Your confusion is justified due to the fact that C is being used in two different senses. One sense is the composition of phases, i.e, C_L, etc you have mentioned. It is used in another sense in Gibbs phase rule. Here it stands for the number of components in the alloy. Since we are discussing binary alloy, C=2.
Usually a combination of two or metals with fixed composition and a single crystal structure is called an inter metallic compound. However, in some cases, like Fe3C, a composition of a metal and a non metal (C) is also called an inter metallic compound.
these videos are brilliant......i mean it....brilliant......and those of you who find the videos slow I suggest watch them at 2.25x speed......smooth and tasty.
Temperature is initially a variable. But after applying the Gibbs phase rule we find the degree of freedom to be zero. Which menas that tempearture as well as the other variables (the three phase compositions) have fixed values.
@@introductiontomaterialsscience flash is a character in a web series which has very amazing speed. He is saying reverse flash means you are slower in the same manner as he(flash) is faster.
Great clarity of concepts But 1 complaint Jo bol rhe ho vo hi likh de rhe ho yrr IITians dekh rhe hai videos ko ... hum krr lenge adjust ... notes banane aata h hume you should just keep on teaching and write only legit important things and whatever you speak
I am an American student and I really enjoy this lectures. Brilliant professor, great explanation.
Because we are indian, we are future
@@Satya___Prakash774 😂❤️🤘🏾
This lectureS... Bro r u really from the states?! 😏
Hats off to the clarity. Thank you so much Professor.
I struggled through phase diagrams and phase transformations. But the prof made it clearer. Thanks.
Sir I am a student of NIT Jamshedpur ECE.Huge respect for you sir🙏🙏🙏🙏 Sir I find interest after learning from you.
Same here👍
i'm too bro even in metallurgy branch and professor here are meaningless with zero knowledge
Thank you sir for your brilliant videos.May Allah gives you better health to carry on this wonderful journey of materials science.Accept my kind love.
Good lecture Sir..🙏
Hand writing is inspired to watch d videooo🙇🙇🙇
Very kind and clear lecture. Thank you sir
sir, you have shown that for 2 phase region we need only one degree of freedom but for particular temprature how we will come to know whether the mixture is hypereutectic or hypoeutectic.
you have considered hypoeutectic mixture.
bcz behind the Ce (towards alpha region) hypo-eutectic phase exist.
Sir can you please make some lecture series on different types of corrosion as well.. it would be really helpful
Strongly agree 👍🏻
Sir your lacture is the best &you are the best professer
U saved me sir
Thank you so much Sir....
great lecture series
Sir, Exactly what do you mean by the term "EQUILIBRIUM" in phase diagrams? Highly confused, I guess, I will get clear understanding from your answer.
at the eutectic horizontal line, temperature is fixed meanwhile you took only pressure is constant but here both are constant? ( F= c- p)
In the phase diagram, only pressure is fixed, temperature is one of the variables. So the phase rule in the form F=C-P+1 will be used. If you now wish to have a three phase equilibrium (P=3) in a binary system (C=2) gives F=0. Thus there is no degrees of freedom This means three phase equilibrium can be had only at fixed compositions of the phases and at a fixed temperature. These compositions and temperature correspond to eutectic horizontal.
@@introductiontomaterialsscience Sir, But the three phase equilibrium is ONE AND ONLY obtained (Crct me if I'm wrong) on the Te i.e 183 deg C(I mean it for Pb-Sn system).This means that Temp is fixed for the 3-phase equilibrium, Moreover the eutectic temperature is also fixed for any phase diagrams. Since, here we are considering our equilibrium at that Te temperature, then how it'll be considered as a variable?Kindly reply at your earliest convenience sir.
@@praveenr3767 We are initially not specifying the temperature. We are only asking for a three-phase (alpha+beta+L) equilibrium (P=3) in a two-component (Pb and Sn) system (C=2). . We have four variables available; compositions of the three phases and temperature. Now we find that (or thermodynamics dictates) that we can have these three phases in equilibrium only T=183 C and and Compositions of alpha, beta and L as 18, 62 and 97 wt% Sn respectively. Thus to have the three-phase equilibrium in this system, all the four variables have fixed values. Thus we can't vary any of these variables and still have the three phases in equilibrium. In other word there is no degrees of freedom (F=0).
Thank you sir.
Call me
How work Gibbs phase rule a in cooling curve for pure metal and eutectic binary alloy or of-eutectic binary alloy?
Sir My doubt is in (L+@) region
How can one doesn,t have different compositions at the same temperture?
As T is a horizontal line we can traverse along it within the region.
As you traverse from one end of the tie-line to the other end, the overall alloy composition changes. And thus, by the lever rule, the proportion of the two phases (i.e., their relative amounts) also changes. But the compositions of the two phases do not change; they are given by the end points of the tie line, irrespective of the alloy composition between these two compositions.
Introduction to Materials Science and Engineering
Thank You Thank You Thank You
Sir
@@introductiontomaterialsscience sir I have a question on phase composition..for instance in ni-cu alloy, if you get the ave. of @ phase and the liquid phase, won't the answer be the overall composition?..coz there's nothing that constitutes the alloy but the solid and liquid, but when I do that the answer is near but not exactly the same as the overall composition...
@@introductiontomaterialsscience sir I have a question on phase composition..for instance in ni-cu alloy, if you get the ave. of @ phase and the liquid phase, won't the answer be the overall composition?..coz there's nothing that constitutes the alloy but the solid and liquid, but when I do that the answer is near but not exactly the same as the overall composition...
@@jhedisavir8133 no, your answer is correct only when the α and L phases are 50 percentage each at the given state.
Else if you have x amount of α and y amount of L, then you should multiply with this x and y respectively i.e. (x * α + y* L) gives you the actual composition of alloy.
Very nice Sir ji 🙏
Prof. I'm confuse of this question, help me out please.
Steel is placed in aerated sea water with a neutral pH. Is corrosion of steel possible? Write down the redox reactions. Use Gibbs free energy to explain. (Assume valence of 2, F= 96500 C/mol, E°oxidation =0.447V, E°reduction= 0.820V)
thanks Sir for clearly, but I confused why u wrote c=2 in the three phase , there were CL , C alpha and C bita
Your confusion is justified due to the fact that C is being used in two different senses. One sense is the composition of phases, i.e, C_L, etc you have mentioned. It is used in another sense in Gibbs phase rule. Here it stands for the number of components in the alloy. Since we are discussing binary alloy, C=2.
Laila oh laila.....kaisi tu laila......
Thank you Sir
Welcome Chhote
sir please define in detail what is intermetalic compounds
Usually a combination of two or metals with fixed composition and a single crystal structure is called an inter metallic compound. However, in some cases, like Fe3C, a composition of a metal and a non metal (C) is also called an inter metallic compound.
Sir, what is the diagram name?by that you gave an example. Pronunciation is not clear. Plzz reply whoever watch this video.
I just called in lead-tin diagram based on the two components of this binary diagram.
@@rajeshprasad101 Thank u so much sir 🙏
Very well explained
@@rajeshprasad101 sir what is the motif of nesosilicates, phyllosilicates and other such complex structures....
24:10 is F(Alpha) also a variable?
watch in 1.25 x speed
Do u like ur own name nigga?
these videos are brilliant......i mean it....brilliant......and those of you who find the videos slow I suggest watch them at 2.25x speed......smooth and tasty.
nice teaching
good handwriting
Thanks for the kind compliments lub
Thank for the information sir because of your teaching im cleard my backlog thank you so much sir..
What's a peritectic reaction?
If on cooling a liquid phase and a solid phase combine to give another solid phase at a fixed temperature it is called a peritectic reaction.
Three phase system (Eutectic Horizontal ) is constant temperature, but why consider temperature variable?
Temperature is initially a variable. But after applying the Gibbs phase rule we find the degree of freedom to be zero. Which menas that tempearture as well as the other variables (the three phase compositions) have fixed values.
Sir is it sufficient for gate exam??
👍👍👍
Sir which book should i refer for all this concepts ??
anil jaggi callister MSM
anil jaggi or VD KODGIRE MSM
@@jayshah1316 Okay Thank you
khodgire by everst publication
Wt%sn means.
Weight percent
From IIT delhi #cs
??
mst joke tha bhai :)
@@ayushraibtech3158 tu toh choza hai
Good but very slow Sir plz go fast
Thanks for your suggestion. If ever I do the revision of these videos, I will try to do it faster.
Reverse flash🤣🤣🤣
??
@@introductiontomaterialsscience flash is a character in a web series which has very amazing speed.
He is saying reverse flash means you are slower in the same manner as he(flash) is faster.
@@Adityasingh-oo1eq Thanks.
@@introductiontomaterialsscience these are not my own thoughts I am a big fan sir!
Reverse flash is also a speedstar, only difference being his ability to manipulate time, unlike flash, to look like a speedstar
Great clarity of concepts
But 1 complaint
Jo bol rhe ho vo hi likh de rhe ho
yrr IITians dekh rhe hai videos ko ... hum krr lenge adjust ... notes banane aata h hume
you should just keep on teaching and write only legit important things and whatever you speak
very slow sir plz go fast
You can increase your speed to 2x if you have any problem.
very slow
Itna dheere kon pdhata hai. Pdne wale ka interest hi khatam ho jayega isse pdhke. Nam ke liye bas iit delhi daal k rkha hai
Speed badha do 2X kar do... Kabhi kabhi computer v chla lo
beta u can adjust speed
ye IIT ke naam ke liye duniya ke tatte shot ho jate h lalla, khair tum Amity vale kaha samjhoge ye sab.....
You are toooo slow 😣😣