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Gravity casting is a traditional casting which has the
characteristicof easily to produce. Squeeze casting is a process
which combines thecharacteristics of casting and forging. In
squeeze casting, aluminum melt solidified in a state of high
pressure so that the castings coulddevelop superior mechanical
properties.The purpose of this study was aimed at investigating
the influence of the metallurgical variables, included the
addition of strontium, siliconand magnesium,on the qualities of
squeeze and gravity castings and theinfluence of the filling
velocity on the qualities of gravity casting.Experimental
results indicated that ：˙In squeeze casting, adding strontium
in A356 effectively improved the properties of elongation and
reliability and adding silicon remarkedly improved the property
of UTS for T6 heat treated castings.˙In gravity casting, adding
silicon in A356 conduced to improved the properties of UTS,
elongation and reliability.˙The results indicated that the
increasing the filling velocity ( >0.5 m/sec), decreased the
reliability of gravity casting produced from different gating
system.
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