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CHP 4 : Imperfections in solids - Coggle Diagram
CHP 4 : Imperfections in solids
Type of imperfections
LINE DEFECTS
Dislocations
slip between crystal planes result when dislocation move
one-dimensional defect
2 TYPE OF DISLOCATIONS
SCREW
Spiral planar ramp resulting form shear deformation
Burger vector is parallel to dislocation line
Displaced in way that creates a spiral or helical ramp around the defect around the defect line.
EDGE
Extra half-plane of atoms inserted in a crytal
Burger vector is perpendicular to dislocation line
Dislocation motion is called slip
Produce permanent (plastic) deformation
AREA DEFECTS
Grain boundaries
POINT DEFECTS
Vacancy atoms
An atom is missing
Interstitial atoms
Extra atoms positioned betweeen atomic sites
self-interstitial
substitutioanal atoms
Equilibrium concentration (formula)
Ionic Crystals points defects
Schottky Imperfection
ions are missing
Frenkel Imperfection
positive cation moves
Substitutional/interstitial
type of bond - metallic/covalent
Solid solution
Solidafication
2 Type of nucleation
COARSE-GRAIN MATERIAL
less pattern
FINE-GRAIN MATERIAL
more small pattern (hexagon)
process of solidification
nuclei (liquid)
crystals growing
grain stucture
TYPE OF GRAINS
Equiaxed(roughly same size in all directions)
Comlumnar (elongated grains)
