· Aleaciones ligeras ·
A. Raji* & R. H. Khan**
Federal University of Technology, Nigeria
67th World Foundry Congress
This work was conducted to determine the optimum squeeze parameters
for producing squeeze castings from the Al alloy and compare the
properties of the squeeze castings with those of chill castings. Al alloy
Squeeze castings were produced using squeeze pressures of 25-150MPa
at steps of 25MPa with the alloy poured at 650oC, 700oC and 750oC for
each of the indicated pressure into a die preheated to about 250oC.
Squeeze time was maintained for 30 seconds.
It was found that for a specific pouring temperature, the grain size of
squeeze cast products became finer; density and the mechanical
properties were increased with increase in squeeze pressure to their
maximum values while further increase in pressure did not yield any
meaningful change in the properties. Squeeze cast sample properties
were compared with those of chill cast samples. It was found that optimum
pouring temperature of 700oC and squeeze pressure of 125MPa could be
used to produce sound squeeze cast Al alloy components with aspect
ratio (height-to-section thickness ratio) not greater than 2.5:1.
