2004 年 44 巻 8 号 p. 1410-1415
Effect of operating parameters of a refining process on the solidified structure such as frequency and intensity of an alternating current has been experimentally examined by use of Sn-10mass%Pb alloy. In the refining process of a solidified structure in this manuscript, a static magnetic field and an alternating electrical current are simultaneously imposed on the local area of a metal or an alloy using copper electrodes. Concerning the intensity of the electrical current, threshold exists for the refining of the solidified structure, and the refined structure is mainly observed around the electrode in the case that the magnitude of the electrical current is around the threshold value. Imposition of the electromagnetic force in the initial stage of the solidification is crucial to obtain the refined structure in this process and the imposition in the middle stage has no refining function.
