Engineering Materials and Manufacturing Processes - Lesson 2A

Engineering Materials and
Manufacturing Processes
Lesson 2

,Aluminium
Aluminum is a light metal
about the third of the density of steel,
copper, and brass.
Aluminum has good corrosion resistance to
common atmospheric and marine atmospheres.
Aluminum has high reflectivity
can be used for decorative applications.
Some aluminum alloys can match or even exceed the
strength of common construction steel.

,Classification of Aluminium Alloys
Alloying Element None (99%+ Aluminium) - 1XXX
Alloying Element Copper - 2XXX
Alloying Element Manganese - 3XXX
Alloying Element Silicon - 4XXX
Alloying Element Magnesium - 5XXX
Alloying Element Magnesium + Silicon - 6XXX
Alloying Element Zinc - 7XXX
Alloying Element Lithium/Other - 8XXX

, Unalloyed wrought aluminium alloys designated 1XXX
the last two digits represent
the purity of the metal.
equivalent to the last two digits after
the decimal point
when aluminium purity is
expressed to the nearest 0.01 percent.
The second digit indicates modifications in
impurity limits.
If the second digit is zero, it indicates
unalloyed aluminium having
natural impurity limits and
1 through 9, indicate
individual impurities or alloying elements.