Effects of pouring method on microstructure of ZL205 Aalloy in sand mold casting were investigated comparatively.The results show that

for low pressure casting

compared with gravity casting

grain size in the alloy is refined due to the solidification under pressure

and microporosity in the alloy castings is decreased significantly with density increase.In addition

the experiment also reveals that the as-cast grain is sensitive to chilling effect

where with increasing in cooling rate

grain size is decreased.For the conventional casting

as a result of the slow cooling rate at the later stage of solidification

θ-Al2 Cu phase may be precipitated in form of lamellar inα-Al matrix

affecting as-cast strength of ZL205 Aalloy.