Solidified Structure Comparison under Imposition of Oscillating Electromagnetic Force and DC Electromagnetic Force

Modification of Primary Mg<SUB>2</SUB>Si Crystals in Hypereutectic Mg-Si Alloy by Application Alternating Current

“…[24][25][26][27] In the present study, when the alternating current was applied into the hypereutectic Mg-Si melt at high temperatures of 770 C and 740 C, it was interesting that obvious agglomerations of refined Mg 2 Si crystals occurred in these two samples and the Mg 2 Si crystals distributed non-uniformly, as shown in Figs. 7(a) and 7(b).…”

“…[16][17][18][19][20][21][22][23][24][25][26][27] This route has an excellent advantage of making no change to the composition of the treated alloys. Many studies have been focused on the modification effect of electromagnetic vibration on the eutectic and primary Si crystals in the AlSi alloys.…”

Refinement of Solidified Structure using DC Electromagnetic Field

“…3, nucleation was not excited by the simultaneous imposition of the static magnetic field and the direct current in the conditions adopted in this investigation. From this result and the fact that the flow is induced by the simultaneous imposition of the static magnetic field and the direct current, 10) it may be said that the mechanism of the structure refinement is multiplication caused by the melt flow.…”

“…Because of the interaction between the electric current and the static magnetic field, an electromagnetic force was excited in the sample, which induced the melt flow in the sample. 10) One of short walls of the vessel was heated while the other one was cooled for the temperature distribution control in the sample. Furthermore, the copper electrodes were heated to reduce temperature disturbance caused by heat extraction through the copper electrodes.…”

“…Then, the simultaneous imposition of a direct current and a static magnetic field has been investigated for the refinement of the solidified structure. 10) In this study, solidification experiments have been done under the imposition of a static magnetic field and a direct current perpendicular each other to excite the electromagnetic force in the melt. And the solidified structures obtained under the different intensities of the direct current and the static magnetic field were compared each other for optimization of the electromagnetic field in this process.…”