MTL 200 Final Exam
BCC Structure. atoms?Formula?
2 atoms
4R=√3 a
FCC Structure. atoms?Formula?
4 atoms
4R=√2 a
Atomic Packing Factor (APF)
(volume of atoms in unit cell)/(volume of unit cell)
Density Formula
=(n)(A)/(Vc)(Na)
Density of Materials in order
metal>ceramics>polymers
Meaning of paranthesis;
( ),< >, { }, [ ]
(planes), <family of directions>, {family of planes}, [directions]
Bragg's Equation
nλ=2 d sinθ
If diffraction angle is given what must happen to it to use in formula.
divide diffraction angle by two to use in formula.
interplanar spacing equation
Conditions for Diffraction in;
FCC?
BCC?
FCC= h,k and l must all be odd or even
BCC=h,k and l must add up to an even number
, Define Vacancy Diffusion
atoms exchange with vacant spots
Define Interstitial Diffusion
smaller atoms squeeze in between big atoms
Factors affecting diffusion
Temperature and diffusion coefficient
Type of diffusion
Time, Concentration
Crystal Structure
Differences between Steady State vs Unsteady State Diffusion
What is;
Self-Diffusion?
Inter-Diffusion?
-atomic migration in pure metals
-migration of atoms from one metal to another metal
liquidus line
liquid on top
solidus line
solid on bottom
eutectic point
where liquid and two solids meet
Eutectoid Point
where one solid meets two other solids
How to find weight fraction in phase diagram
-make tie line
-take value of opposite section and divide by whole
most common coordination numbers
BCC Structure. atoms?Formula?
2 atoms
4R=√3 a
FCC Structure. atoms?Formula?
4 atoms
4R=√2 a
Atomic Packing Factor (APF)
(volume of atoms in unit cell)/(volume of unit cell)
Density Formula
=(n)(A)/(Vc)(Na)
Density of Materials in order
metal>ceramics>polymers
Meaning of paranthesis;
( ),< >, { }, [ ]
(planes), <family of directions>, {family of planes}, [directions]
Bragg's Equation
nλ=2 d sinθ
If diffraction angle is given what must happen to it to use in formula.
divide diffraction angle by two to use in formula.
interplanar spacing equation
Conditions for Diffraction in;
FCC?
BCC?
FCC= h,k and l must all be odd or even
BCC=h,k and l must add up to an even number
, Define Vacancy Diffusion
atoms exchange with vacant spots
Define Interstitial Diffusion
smaller atoms squeeze in between big atoms
Factors affecting diffusion
Temperature and diffusion coefficient
Type of diffusion
Time, Concentration
Crystal Structure
Differences between Steady State vs Unsteady State Diffusion
What is;
Self-Diffusion?
Inter-Diffusion?
-atomic migration in pure metals
-migration of atoms from one metal to another metal
liquidus line
liquid on top
solidus line
solid on bottom
eutectic point
where liquid and two solids meet
Eutectoid Point
where one solid meets two other solids
How to find weight fraction in phase diagram
-make tie line
-take value of opposite section and divide by whole
most common coordination numbers
