Biomedical Engineering Reference
In-Depth Information
Fig. 8.3
Macroscopic section through a copper ingot.
Top of the figure
: external surface where
cooling starts,
bottom
: center of the ingot where two cooling fronts meet
Fig. 8.4
Phase diagram of AZ91
The melt with a composition of about 16%Al segregates, when cooled below
the solidus/liquidus temperature of 560-590
ı
C, into solid
˛
particles containing
5%Al and a liquid solution. Further cooling brings us to the domain, where
˛
and
coexist. The interesting thing is now that this domain is reached not by
conventional cooling from the normal die casting temperature of
ˇ
700
ı
C but by
injection at temperatures of 560-590
ı
C into a mold. The technique is called here
