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· Cartridge brass (Cu) or the
a-phase is a substitutional solid solution
of zinc in a copper matrix. It retains this solid
solution structure
until it starts to melt at about 910 C.
· Muntz metal is a two phase material at room temperature (a + g) and transforms to (a + b) at about 375 C, (a + b)
at about 475 C, and to b
at about 790 C after which it melts at circa 898 C.
· The room temperature mechanical properties of these
alloys depend upon composition and upon dislocation
interactions with the
phases present.
· Cartridge
brass is ductile
with a low work
hardening which makes it good for deep drawn structures
(cartridges).
· The two
phase structure of Muntz metal reduces its ductility and increases its room
temperature work hardening rate, making cold
working difficult. Its UTS
is higher than that
of cartridge brass.
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