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Light
alloys are based on low density metals such as aluminum and magnesium.
For
the aluminum system the following designations are used.
1xxx
alloys are essentially pure aluminum
2xxx
denotes a two phase alloy with Cu
3xxx
a substitutional alloy with Mn
4xxx
a two phase Si alloy
5xxx
a substitutional alloy with Mg
6xxx
a two phase system with both Si and Mg
7xxx
a two phase alloy with Zn.
Magnesium
has a lower density (1.74 Mg.m-3)
than aluminum (2.7 Mg. m-3)
and its alloys are useful for aerospace applications. Aluminum, manganese
and zinc are the major alloying elements. The alloying elements are designated
by a letter code: A = Al, K = Zr, M = Mn, E = rare earths, Q = Ag, S =
Si,
H
= Th, Z = Zn, and T = Sn. |
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