Effects of low-voltage electric current pulse were described on solidification structure and mechanical properties of ignition-proof magnesium alloy ZM5-3Ca. The results show that the solidification structure in the alloy is refined after applying low-voltage electric current pulse

in which the primary phase is converted from developed dendrite into near-spherical or rosette structure. Primary phase in the alloy is increasingly spheroidized with decreasing in cooling rate

meanwhile

with increasing in pulse voltage

the grain size in the alloy is refined gradually

and yield strength and tensile strength of the alloy are improved

however

the obvious change of plasticity can not be observed. With voltage of 400V

yield strength and tensile strength of the alloy are increased by 9% and 19%

respectively

compared with those of ones without low-voltage electric current pulse.