Primary silicon in the solidification structure of Al-18Si hypereutectic alloy concentrated on the edge of the sample

in which some appears to be coarse plates and strips

and the eutectic structure appeared in the center of the sample without the static magnetic field.The bulky uneven primary Si in size and distribution was distributed into the whole section of the sample with radius static magnetic field.Furthermore

imposing radius static magnetic field and adding P modifier can obtain bulky and finer primary Si with even size and distribution.