Microstructure and precipitated phase morphology of ZL205A alloy were investigated by centrifugal machine at 1 g、1 000 g、2 000 g、3 000 g、4 000 g(1 g=9.8 m·s

-2

)

and effects of high gravity field on the properties of ZL205A alloy were analyzed.The results reveal that

the high gravity field can reduce segregation defects in ZL205A alloy and refine obviously grain size.In the normal gravitational field of 1 g

the solidification structure in ZL205A alloy presents the large blocky segregation

and the grain size reaches 85μm.However

the segregation in the high gravity field is decreased with increasing in the high gravity field.When the gravity field reaches 4 000 g

the segregation reaches the lowest

and the grains become equiaxed grain with size of 35μm.The high gravity field can improve the morphology of precipitated phaseθ-phase.When the gravity field is 1 g

theθ-phase presents coarse bulky structure

while in the high gravity field

the θ-phase becomes small blocky structure.The refinement effects is increased with increasing in the gravity field.The hardness of ZL205A can be increased under high gravity field

which is 64.3 HV under normal gravity field

while it is 83.4 HV at 3 000 g.