6.2 Flashcards
Non Ferrous
No iron
1000 series
99% Pure Aluminium
2000 series
Copper
3000 series
Manganese
4000 series
Silicon
5000 series
Magnesium
6000 series
Magnesium and Silicon
7000 series
Zinc
8000 series
Lithium and others
Melting point of Pure Aluminium
660 °C
Relative Density of Pure Aluminium
2.7
Tensile Strength of Pure Aluminium
13 KSI
First Digit in Aluminium Association Inc
Alloy Type
Second Digit in Aluminium Association Inc
Modification
3rd and 4th Digit in Aluminium Association Inc
Purity of Aluminium in hundreds of a percentage
If second digit is a zero
Indicates the original alloy
What series is Duralumin
2000
Where are cast aluminium alloys used
Pump housings
Gearboxes
Hubs
What is work hardening
Grains in metal gain stresses as they are worked making it harder
Another name for Work Hardening
Cold Working or Strain Hardening
What is Solution Heat Treatment
Heating Metal to set Temp and rapidly quenching it
What is Age Hardening
Allowing Metal to naturally cool as it returns to its Natural / Original Hardness
Annealing
Work Hardened material heated to dissipate inner stresses making the material softer
What is temper
Work used to describe the metal condition
Includes Hardness Malleability and Ductility
What is Cladding
Pure Aluminium cold rolled onto AAlloy
Pure Aluminium oxides to form protective layer
5% of total thickness
What is Artificial Ageing Or Precipitation Treatment
Replicating Age Harding
Approx 170 °C for 10 Hrs
How long do you have to wait to rivet an Aluminium Alloy after Solution Heat Treatment
24 Hrs
Why should you not Overheat Aluminium
Can cause brittleness weakness and roughness on surface
How many times can you Heat Treat a Cladded Material and Why
3x
Long periods at high temp, Particles can move into Aluminium Alloy
Failure to Quench a Material in time will
Impairs Corrosion Resistance
How long between removal from Heat Treatment Furnace and Quenching
Max 7 seconds
F
Fabricated
H
Cold worked with / without Thermal Treatment
H1
Cold worked without Thermal Treatment
H2
Cold Worked and Partially Annealed
H3
Cold Worked and Stabilised by Low Temp Heating
What does the second digit after H mean
EG H2X
Degree of Hardness
Hx2
1/4 hard
Hx4
1/2 hard
Hx6
3/4 Hard
Hx8
Full Hard
Hx9
Extra Hard
O
Fully soft Annealed
T
Heat Treated to Produce Stable Tempers
T1
Cooled from Hot working
Naturally Aged
T2
Cooled from Hot Working
Cold Worked
Naturally Hardened
T3
Solution Heat Treated
Cold Worked
T4
Solution Head Treated
Naturally Aged
T5
Cooled from Hot Working
Artificially Aged
T6
Solution Heat Treated
Artificially Aged
T7
Solution Heat Treated
Stabilised
T8
Solution Heat Treated
Cold Worked
Artificially Aged
T9
Solution Heat Treated
Artificially Aged
Cold Worked
T10
Cooled from Hot Working
Cold Worked
Artificially Aged
W
Solution Heat Treated
What series are not heat treatable
1000
3000
4000
5000
Annealing Temp for Non Heat Treatable Alloys
350-400 °C