Grain Structure by Khalil https://padlet.com/khalil_dacosta/xxplk99y1vg Facts about grain structure en-us 2018-10-09 11:29:05 UTC 2018-10-16 11:48:40 UTC hello@padlet.com 3 MOST COMMON LATTICE STRUCTURES khalil_dacosta https://padlet.com/khalil_dacosta/xxplk99y1vg/wish/290662433 Body-centred cubic (BCC)
Face-centred cubic (FCC)
Hexagonal close-packed (HCP)]]> 2018-10-09 11:32:30 UTC https://padlet.com/khalil_dacosta/xxplk99y1vg/wish/290662433 Crystal structure lattices khalil_dacosta https://padlet.com/khalil_dacosta/xxplk99y1vg/wish/290663021 As atoms of a pure metal cool, they start to form crystalline lattice structures]]> 2018-10-09 11:34:11 UTC https://padlet.com/khalil_dacosta/xxplk99y1vg/wish/290663021 How does metal grain form khalil_dacosta https://padlet.com/khalil_dacosta/xxplk99y1vg/wish/290663355 Crystals form the grains in the solid metal;the crystals grow depending how long the metal takes to cool.]]> 2018-10-09 11:35:23 UTC https://padlet.com/khalil_dacosta/xxplk99y1vg/wish/290663355 What is an grain boundary khalil_dacosta https://padlet.com/khalil_dacosta/xxplk99y1vg/wish/290665383 A grain boundary is the interface between two grains or crystals; grain boundaries are 2D defects in the crystal structure.]]> 2018-10-09 11:41:27 UTC https://padlet.com/khalil_dacosta/xxplk99y1vg/wish/290665383 macroscopic effects risks of grain boundary khalil_dacosta https://padlet.com/khalil_dacosta/xxplk99y1vg/wish/290667115 grain boundaries are known to affect the diffusivity in polycrystalline materials.

]]> 2018-10-09 11:46:11 UTC https://padlet.com/khalil_dacosta/xxplk99y1vg/wish/290667115 vacancy point defect khalil_dacosta https://padlet.com/khalil_dacosta/xxplk99y1vg/wish/290669479 a vacancy is produced when an atom is missing from its original lattice site; so its creates an empty lattice site]]> 2018-10-09 11:52:12 UTC https://padlet.com/khalil_dacosta/xxplk99y1vg/wish/290669479 Interstitial point defects khalil_dacosta https://padlet.com/khalil_dacosta/xxplk99y1vg/wish/290670220 this type of defects occurs when a atoms assume a normally unoccupied site in the crystal structure.]]> 2018-10-09 11:54:07 UTC https://padlet.com/khalil_dacosta/xxplk99y1vg/wish/290670220 elastic deformation khalil_dacosta https://padlet.com/khalil_dacosta/xxplk99y1vg/wish/290673943 a material under elastic deformation caused by an applied stress will return to to its original shape once the stress is removed.]]> 2018-10-09 12:04:34 UTC https://padlet.com/khalil_dacosta/xxplk99y1vg/wish/290673943 body-centred cubic khalil_dacosta https://padlet.com/khalil_dacosta/xxplk99y1vg/wish/293242332
]]> 2018-10-16 10:44:00 UTC https://padlet.com/khalil_dacosta/xxplk99y1vg/wish/293242332 Face centred cubic khalil_dacosta https://padlet.com/khalil_dacosta/xxplk99y1vg/wish/293242700
]]> 2018-10-16 10:45:32 UTC https://padlet.com/khalil_dacosta/xxplk99y1vg/wish/293242700 Hexagonal close-packed khalil_dacosta https://padlet.com/khalil_dacosta/xxplk99y1vg/wish/293243122
]]> 2018-10-16 10:47:14 UTC https://padlet.com/khalil_dacosta/xxplk99y1vg/wish/293243122 Screw Dislocation khalil_dacosta https://padlet.com/khalil_dacosta/xxplk99y1vg/wish/293244054 this happens due to shear stress which causes ]]> 2018-10-16 10:50:45 UTC https://padlet.com/khalil_dacosta/xxplk99y1vg/wish/293244054 edge dislocation khalil_dacosta https://padlet.com/khalil_dacosta/xxplk99y1vg/wish/293245182 this happens when there's an extra half-plane in a lattice]]> 2018-10-16 10:55:45 UTC https://padlet.com/khalil_dacosta/xxplk99y1vg/wish/293245182 What is a planar defect? khalil_dacosta https://padlet.com/khalil_dacosta/xxplk99y1vg/wish/293247043 planar defects are defects such as lack of fusion and cracks that lie in one plane.]]> 2018-10-16 11:05:03 UTC https://padlet.com/khalil_dacosta/xxplk99y1vg/wish/293247043 Plastic deformation khalil_dacosta https://padlet.com/khalil_dacosta/xxplk99y1vg/wish/293248247 this happens when stress not only stretches the bonds between the atoms but also causes them to slide over each other and creates new bonds]]> 2018-10-16 11:10:44 UTC https://padlet.com/khalil_dacosta/xxplk99y1vg/wish/293248247 what is a polycrystalline structure khalil_dacosta https://padlet.com/khalil_dacosta/xxplk99y1vg/wish/293250074 these are solids that are composed of many crystallites of varying size and orientation]]> 2018-10-16 11:17:02 UTC https://padlet.com/khalil_dacosta/xxplk99y1vg/wish/293250074 BCC khalil_dacosta https://padlet.com/khalil_dacosta/xxplk99y1vg/wish/293250957 Slip planes in BCC are those with the greatest spacing between them therefore the metals tend to have high strength]]> 2018-10-16 11:20:28 UTC https://padlet.com/khalil_dacosta/xxplk99y1vg/wish/293250957 FCC khalil_dacosta https://padlet.com/khalil_dacosta/xxplk99y1vg/wish/293251543 In FCC it contains four close packed planes; one of these can form a slip plane in three possible directions therefore the materials tend to have low strength and high ductility]]> 2018-10-16 11:22:32 UTC https://padlet.com/khalil_dacosta/xxplk99y1vg/wish/293251543 HCP khalil_dacosta https://padlet.com/khalil_dacosta/xxplk99y1vg/wish/293252317 HCP contains one close-packed plane; this can form a slip plane in three possible directions therefore metals tend to have low ductility]]> 2018-10-16 11:25:12 UTC https://padlet.com/khalil_dacosta/xxplk99y1vg/wish/293252317