Screw dislocations

Geometry of a screw dislocation: parallel planes perpendicular to the dislocation line become helicoidal surface with screw dislocation line as the axis of the helicoid. A right-handed screw dislocation.

[@garvitvyas725]

Your making me fallen love with material science...Happy Teacher Day to best Teacher

[@vishnusuresh168]

4:53 let me challenge my drawing skills for you" - Dedication of the lecture to the peak sir.

[@shivampadmani]

Even a primary school student can understand very easily from you..........Great explaination Thank you sir.

[@kolimirajeshwarreddy8674]

Our lecturers never teach us by using models like this . You are a perfect lecturer.

[@exterminator4808]

That's why he teaches in IIT Delhi.

[@vikasashokingale3671]

Bro he is not lecturer...He is Top most level Professor... Equivalent to Scientist 😁

[@pravindeshpande7554]

He may be having different teaching style. Every body is having some strong points which u missed.

[@nishchala8455]

wonderful lecture sir! I couldn't understand the concepts in my class but now this made my concept clear! Thank you for this work done sir. You helped me learn in a playful manner!

[@christerranaldo906]

Great explanation. I couldn't wrap my head around the illustrations in my textbook but now it totally makes sense :)

[@shraddhahule169]

Perfectly explained 👏👏 Thank you so much sir

[@abhinababanerjee683]

Sir, in some reference (www.princeton.edu/~maelabs/mae324/glos324/climb.htm#:~:text=Dislocation%20Climb&text=Climb%20is%20the%20motion%20of,and%20their%20number%20is%20large.) while discussing climb and glide motion, it is being said, "climb is the motion of an edge dislocation normal to its slip plane". It can be understood from the rest of the discussion in those references, that by climb motion it's speaking of the dislocation motion in screw dislocation. Sir, my first doubt is, even in screw dislocation, the dislocation motion occurs parallel to the slip plane as evident from your video diagram. Although in screw dislocation the slip plane orientation is different (perpendicular) from that in edge dislocation. So, how can we saw that climb motion refers to dislocation motion normal to slip plane? My second question, after understanding edge and screw dislocation, how to associate glide and climb motion with these dislocations? Does both motion occurs in both type of dislocations? My, third question, how does climb motion occurs in edge dislocation?(Reference:.www.princeton.edu/~maelabs/mae324/glos324/climb.htm#:~:text=Dislocation%20Climb&text=Climb%20is%20the%20motion%20of,and%20their%20number%20is%20large ) My understanding says, there should be only glide motion in edge dislocation and only climb motion in screw dislocation.

[@introductiontomaterialsscience]

All dislocations can glide. Only edge can climb. Only screw can cross-slip. kzbin.info/www/bejne/pYvZd5Zvedl_ms0

[@abhinababanerjee683]

@@introductiontomaterialsscience Thank you Sir for the reference. I somehow missed that lecture of yours.

[@hironmoychowdhury2985]

if perfect visualizations exist, here it is every time I stuck ,his lectures help me a lot thanks sir

[@Vickysahu0092]

Sir, If we apply RHFS rule,considering the RH circuit around spiral ramp as you have made. Why the burgers vector from this rule comes out to be in opposite direction of b as shown in figure ? Or can we say that slip is relative ?

[@Kleemkrom]

Very logical and so simple described. Awesome. Prof.

[@jnyanendrarajbongshi603]

Thanks for mkaing these lectures Its been a great help to me

[@SunilYadav-yk3cw]

Sir, why motion of screw dislocation is sluggish than edge dislocation in ambient temperature?

[@introductiontomaterialsscience]

This is indeed an interesting and difficult question. By the way, what is your source of this fact? I am unable to answer it on the basis of my present knowledge. I checked a the book by Hull and Bacon, 'Introduction to Dislocations' Fifth edn where on p. 51 they mention that in the low velocity range edge dislocations move 50 times faster than screw. But they have not provided any answer. They actually quote from a classic paper by Johnston, W.G. and Gilman, J.J., Journal of Applied Physics, Vol. 30, 1959, p129 entitled "Dislocation Velocities, Dislocation Densities and Plastic Flow in Lithium Fluoride Crystals". These authors have experimentally established this fact but have not forwarded any explanation. I thus feel that this is a 'research question'. You are welcome to explore more and share any findings with me.

[@exterminator4808]

Now I know why it's called a screw dislocation.

[@HJWSM]

Excellent way of teaching thanks a lot sir for teaching

[@Rajsingh-hb1si]

Your drawing skills are awesome

[@nikhithan3621]

V cn easily undrstnd and memorize by lookng into pictures..... It creates interest in subject..... Thank you sir

[@maghamsrinivasu3571]

Awesome Explanation. Simply Superb Sir.

[@arvindpokhriyal5528]

Sir how movement of dislocations occur in screw dislocation?

[@introductiontomaterialsscience]

This may help; kzbin.info/www/bejne/pYvZd5Zvedl_ms0

[@basil6276]

I am a geologist I was studying mineralogy and here I am 😮

[@samermajanni3512]

I tried to search a good videos in 3 languages to learn the screw dislocation but as I watched your videos I got that Thank you the professor of professors

[@kamleshkumarjha7124]

Thanks sir for clarifying my concept abt the screw dislocation...

[@parasjain9416]

Dhanyawad Sir

[@zhiliye5838]

thank you。I totally understand this。

[@lincolnclay9106]

truly amazing.. lost my words

[@prakashpunj3245]

Thank you so much sir great explain with QED...

[@sahilrajeshgajbhiye4968]

U r not gem sir TY very much sir

[@TarunSingh-hn2kb]

Shouldn't Burgers vector be in upward direction (according to finish to start rule)?

[@thecivilizedguy8425]

What a beautiful explanation!

[@modernphysics7474]

💙

[@victormbebe3797]

amazing

[@manojsinghsatya23]

I have studied about the defects in solids before, but the way of you are teaching makes it so much interesting that I am watching these lectures one by one. You are making the concepts very clear. Thank You Sir

[@fazalrehman2058]

very good sir ..its very helpfull..great

[@PrinceKumar-ou6he]

Thank you sir 😊

[@arwasaed1025]

Thanks 💛💛

[@vishwajeetsingh-om5gw]

thank you sir

[@kishorchakraborty5683]

Awesome 😎

[@Verma021]

🙏🙏🙏🙏🙏 dhanyawad guruji

[@revanthsibiram4376]

Thanks a lot Sir .Now i have understood

[@playerhk8649]

wish if I have you as my material Science lecturer ….

[@Pradeepgk17]

👌👌👌👌 wow nice explanation

[@theprogrammer4544]

What is meant by burgus vector

[@introductiontomaterialsscience]

You may like to look at this video. kzbin.info/www/bejne/eWbbfYGOma5oaKc Complete playlist for the entire course entitled Introduction to Materials Science and Engineering is here: kzbin.info/door/RFAeCBIRZrY8YcuLomFU1gplaylists

[@rvsgkp]

Thank you Sir

[@norbusherpa2936]

thank you sir

[@ATaruneswar]

Excellent

[@prakashgosai7796]

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[@pr10510]

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[@adarsh7307]

nice

[@najeerapullichola9764]

Super

[@skbrajraj831]

U r best sir

[@rajibdas1087]

brilliant

[@张书豪-f2u]

听不懂

[@rajeshprasad101]

Please translate your name and the comment. thanks.

[@张书豪-f2u]

@@rajeshprasad101 i like your video sir

[@introductiontomaterialsscience]

@@张书豪-f2u Thanks.

[@dibyendusingha7493]

@@rajeshprasad101 sir can you please explain about the application of shear stress on this dislocation.

[@T8_SXY.]

Waste