Much of material behaviour is due to…
Internal material structure
The phases present
Define crystals
Regular array of atoms
State the structure of metals
Poly crystalline
State metals with fcc structure
Gamma iron
Aluminium
Copper
Define grains
Regions of the same crystal orientation
State close packed structures
FCC
HCP
State metals with HCP structure
Alpha titanium
Zinc
What is the packing fraction in HCP?
0.74
What is the packing fraction in FCC?
0.74
How many crystal systems are there?
7
Phases can be…
Regions of different composition
Regions of different structure
A phase diagram shows…under equilibrium conditions
The phases present
Phase compositions
Phase amounts
An equilibrium phase diagram shows you what?
The phases for a given composition at a specific temperature given sufficient time
