Why are metals so stretchy? (2^13 sub special)

It's play button time, and today it's made from copper foil - a surprisingly stretchable material. You wouldn't think that crystalline materials like metals could deform without destroying the atomic pattern that gives them their strength and electronic properties, but with the help of a crystal defect called a dislocation, it's super easy. Dislocations are agents of plastic deformation, traveling through crystals and enabling malleability and ductility in soft metals like copper, making them great raw materials! I hope you enjoy this dive into the materials science of plastic strain, and if this is your first video here, be sure to subscribe for more!

Thanks to all my OG subscribers, and welcome to the new ones! And a big thanks to Steve Mould for sending some of his awesome fans my way. https://www.youtube.com/user/steventhebrave

Corrections and Clarifications:

• "Plastic deformation" is a term that means a permanent change in shape, even in metals, we call it plastic.
• There are also grain boundary considerations in polycrystalline materials that I don't address at all - mostly it shows up in tension, because bubble rafts aren't ACTUALLY very ductile.
• More to add when I get convinced I'm wrong!

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#Materials #Physics #Crystals

The original bubble model video from 1952 narrated by Bragg himself - a real hidden gem of matsci history. https://youtu.be/UEB39-jlmdw

GIFs: short: https://gfycat.com/contentinsignificantbunny long: https://gfycat.com/compassionatewavybuzzard

Music in this video: I Dunno by grapes is licensed under a Creative Commons Attribution license (https://creativecommons.org/licenses/by/3.0/) http://ccmixter.org/files/grapes/16626 The UNKILLABLE Snake AI (Entire 30x30 game)

Hestu tune from Nintendo Legend of Zelda: Breath of the Wild ... https://www.youtube.com/watch?v=sn1Y6zIS91g