11. Dislocation basics

[@reddeimon475]

Cant hear anything

[@alexjordanmes3]

Perfect explanation! Thank you from Italy.

[@johnday2022]

great video, thanks from India.

[@astelintel]

Can a dislocation be manageable? We can use dislocation like quantum intelligence neurons.

[@engineersakura1269]

What the difference between dislocation in cubic structure and non cubic structure

[@theroadnottaken_]

how do you immediately know what direction the dislocation line or core is?

[@foureyedplatypus]

this helps a lot, thanks!

[@jorgitomich2]

Thank you so much. Where can I download the Vesta files...?

[@楚闻笛]

thanks from china. really helped me a lot

[@franciscofmok]

Nice video, It helped me a lot. Greetings from Argentina!

[@YomnaHamdy]

Thanks for your effort, it really helped me. greeting from Egypt

[@Pro-dq9ey]

sir，where can i get these series of ppt？thx！

[@bayisagemeda9916]

better one

[@adwaithvk7274]

not able to hear

[@abinashr3091]

Sound a pesu da pindamane

[@ReverseEngin33red]

Extremely good explanation

[@DiamondSane]

*DISCLAIMER* *If* *you* *are* *a* *student* *before* *exam* *do* *not* *read* *further* , *that* *may* *prevent* *you* *from* *"understanding"* *edge* *dislocation* . Thanks for the briefing. I have an odd question. I do not actually expect you to answer it, but I am asking. At 3:26 you draw a contour around dislocation. I saw this picture in every relevant books, and probably you did it too. My question is how do you choose the next atom in the contour when you are going up or down? This is not the atom in next position of lattice side, because "down" is sloped one way, and "up" is sloped in different way. You would probably say "It's because of dislocation presence" but, the translation identity vector of lattice must not be dependent on the crystal site position where you are standing. These are three vectors that must be constant, or what basis or periodicity we are talking about then. The different slope while going up or down means that we do not follow the direction of basis or the basis is not global. But I don't want to talk about curved space, instead I ask what is a Burger's vector? In books they say "go 5 atoms left go 5 atoms down go 5 atoms right go 5 atoms up and the remaining is the Burgers vector". But as I already said, "up" and "down" must be clarified in our situation. I have experienced bachelor in materials science, studying the elastic field of edge dislocation, and now I am in process for master's degree. This problem worried me for a long time. Thanks again for your attention.

[@JeramyZimmerman]

A dislocation marks the core of an error in the perfect symmetry and the crystal surrounding the core is strained. To draw a Burgers circuit, we move far enough from the core that the crystal strain is relatively small and we can follow the slightly distorted crystal. By drawing it as I have done (along the distorted crystal), it is hard to argue that there would be a better way to make a decision that keeps us on lattice points. That is, in the vertical up red arrow, up and left is much further from the ideal lattice points than up and a tiny bit right.

[@DiamondSane]

Okay, thanks for the answer. Glad to see you are on line. But if you ask me what is the magnitude of Burgers vector, I would answer it is the value of *b* in the elastic theory of dislocations(Hirth Lothe for example), where you have a formula for atomic planes displacement. More precisely, the minimal possible value that links planes around removed material together in way that they make a perfect lattice asymptotically. Actually, the problem I see in classical description of how to find the Burgers vector is that is not formal. It is obvious for simple cubic edge dislocation, but more complex structures I suppose it may fail.

[@sofiagupta1506]

Nice explanation sir☺👍👍

[@onmabu1407]

Nice video.

[@MMphotography1996]

Nice effort bro ! Thanx a lot :)

[@fpl8648]

Thank you!

[@chetansingh51]

Hiii

[@yadaplukmontol6291]

I swear I first saw "parking deck" as "pecking duck"and like wtf... #latenightbeforeexam