Chp. 8: Defects in Solids Flashcards
Imperfections
the atoms structure in a material and their ability to move hence deformability and ductility of the material.
Dislocation
when atoms move a row at a time
edge dislocation
when an extra “half-plane” is inserted (half a page into middle of book)
dislocation line
the termination of the half plane is a line
A dislocation is a defect that allows atoms to…
…slide over each other, but it only produces a net movement of one atom spacing.
Dislocations allow planes to…
…move in many directions at the same time.
High atoms density are…
…the furthest apart and move more easily or smoothly.
Plastic deformation
When a dislocation is permanent until a force is applied in the opposite direction
Elastic deformation
When there is a less equal force and the atoms slide back, elasticity like a rubber band.
Vacancy
An Intrinsic Point Defect in which an atom or group of atoms are missing, producing a distortion
Interstitial
An Intrinsic Point Defect in which there is an extra atom pushing its way into the sites between atoms creating unoccupied sites called interstices.
Vacancy Motion
the movement of vacant spaces
Interstitial Extrinsic Point Defect
An extrinsic point defect where impurity atoms sit in the spaces (interstices) between the original atoms
Substitutional
when an impurity atom is usually about the same size of the atoms of the host material.
Solid Solubility
when two materials are completely soluble in each other
