Al production describing the extraction or winning Al from ore
primary production
Al production producing aluminum from recycled material
secondary production
Coarse grains only used for two applications
1 - creep resistance
2 - crack propagation retardance
Purity of majority of primary Al produced
99.0-99.9%
"high purity" Al percentage
99.97-99.9999%
Secondary Al makes up how much of total Al production
35%
why does secondary Al cost less
requires only 5% of primary energy input
what industry uses majority of secondary Al
automotive
Al form made to be broken into smaller pieces and mold-cast or alloyed
Pigs
Al ingot form for rolling into plates, sheets and foils
slab ingot
Al form ingot for forging, extrusion of bars, profiles, tubes and wires
Round ingot
Primary cast-products, in all alloy systems
Ingots
after an ingot is worked into a bar or other semi-finished shape to prepare for final processing by closing the casting porosity, refining the grain-structure and reducing the shape to a workable shape
Billet
form of majority of primary Al products
Direct-cast slab and billet ingots
process that eliminates the need to roll thick slabs
Continuous-strip-casting process
What is the difference between primary processing and primary production of Al
Processing - usually a method of continuous operation of Al forming (i.e. cooling molten Al into a sheet for rolling)
Production - winning Al from ore
why is primary processing not used for aerospace grade materials?
Primary processing does not control the chemistry well enough for these applications
what is the purpose of alloying
Alloying is used to inprove properties and castability
1XXX alloys
none
2XXX alloys
Cu
3XXX alloys
Major - Mn
7XXX alloys
Major - Zn
other - Cu and Mg
Cu strengthening mechanism
solid solution
what Al alloy forms very small particulates
Zn (often with MgZn2)
Three methods used to strengthen Al alloys
1 - Work-hardening
2 - Heat-treatment
3 - combination of both
Author
kingsj
ID
20578
Card Set
Light Structural Material
Description
Daniel Eylon's Light Structural Materials course MAT 577