Effects of untreated

Zr modification

treatment of pulsed magnetic field and compound treatment of pulsed magnetic field and Zr were investiagted on the solidified structure and compression properties of Mg-5Y-2.5 Zn-1.2Ca alloy enhanced by long period structure.Effects of pulse voltage and frequency on the alloy under compound treatment condition were also analyzed.The results show that after Zr modification

treatment of pulse magnetic field and compound treatment

solidification structure and compression properties of the alloy are improved

and the compound treatment presents the desirable effect.The compressive strength and compression ratio of the alloy with compound treatment are increased by 43.9% and 15.4%

respectively.In the range of 0～300 V

as the pulse voltage increases

grain size of the alloy is decreased gradually.In the range of 1～10 Hz

as the pulse frequency increases

grain size of the alloy is decreased at first and then increased

and the turning point is 5Hz.The smaller the grain size is

the more uniform the second phase distribution is.The compressive properties of the alloy are corresponded to its grain size.