midterm 1 Flashcards
1
Q
simple cubic cell volume
A
2r
2
Q
bcc cell volume
A
a=4r/√3
3
Q
atomic packing factor
A
what fraction of the cell is occupied by atoms
4
Q
fcc cell volume
A
a=4r/√2
5
Q
volume of a sphere
A
4/3(pi)r^3
6
Q
simple cubic CN
A
6
7
Q
bcc CN
A
8
8
Q
fcc CN
A
12
9
Q
largest interstitial
A
r=(√2(2R)-2R)/2
10
Q
frankel defect
A
an interstitial that tries to join up with another
11
Q
hume rothery rules
A
radius within 15%
same crystal structure
similar valency
similar EN
12
Q
edge dislocation
A
incremental motion as an attempt to relieve stress through materials (response to external stress)
13
Q
burgers vector
A
perpendicular to plane of dislocation
14
Q
screw dislocation
A
dislocation not in 2D
in a lattice it can move everywhere
