Effects of holding time and holding temperature on stability of electromagnetic stirred ZL117 alloy slurry have been investigated.The experimental results show that the diameter of primary Si particle in the semi-solid slurry is gradually increased with the increase of holding time

in which the growth velocity of the primary Si particle is very slow before 15 min while is rapidly increased after 15 min.The diameter of primary Si particle is increased gradually with increasing holding temperature.The shape coefficient of primary Si particle is increased gradually with extending holding time

whereas

it is slowly increased before 15 min and rapidly increased after 15 min.The minimum shape coefficient of primary Si particle can be obtained at 620 ℃

and the shape coefficient is increased with increasing in holding temperature at 620 ℃

6

50 ℃.