Effects of processing parameters

such as different pulse voltage

pulse frequency

pouring temperature and mold temperature

on solidified structure of Mg-Y-Cu-Zr-Sr alloy with long period ordered structure were investigated under pulsed magnetic field.The results show that solidified structure of the alloy can be refined obviously by pulsed magnetic field.Primary phase of the alloy is transformed into rosette crystal with uniform distribution of second phase.When the pulse voltage is at 0

2

40Vor pulse frequency is at 1

1

0Hz

with the increase of pulse voltage or pulse frequency

solidified structure of the alloy is refined gradually.When the pouring temperature is at 660

7

50 ℃ or the mold temperature is at 200

6

00 ℃

with the increase of pouring temperature or the decrease of mold temperature

microstructure of the alloy is refined gradually.