Electric current pulse induced grain refinement in pure aluminium

Abstract

In the present work, pure aluminium melt was treated using electric current pulse. The effect of current density on the solidification microstructure was investigated by means of wire netting technology. It was found that wire netting could not only effectively stop crystal nucleus to enter other zones but also has relatively small effects on the heat transfer and convection in melts. Theoretical analysis and ANSYS simulation suggested that variation of current density in different localised zones is a key factor influencing the microstructural features. Increasing the current density is favourable for the formation of equiaxed grains.

The grain refinement of aluminium by a new as-cast Al–Ti–TiCN composite

“…To solve this problem, some refiners and preparation methods are employed to improve the wettability of ceramic particles in the matrix so that they can be uniformly dispersed in the matrix. Some techniques such as ultrasonic stirring technology, electric current pulse and equal channel angular pressing can promote the uniform dispersion of ceramic nanoparticles in aluminium alloys [5,6,17,18]. Li et al [19] developed new mixture heterogeneous nucleants to refine aluminium-based composites.…”

Effect of flow on solidification structure of pure aluminium under pulse magneto-oscillation

“…In 1966, Utech and Flemings [2] first applied a direct current magnetic field to the solidification process of an In-Sb melt containing Te impurities. In 1995, Bamak et al found that the pulse current greatly reduced the eutectic cells of Sn-Pb alloy [3][4][5][6][7]. In recent years, pulsed electromagnetic field has become an emerging technology in the area of electromagnetic coagulation [4,[8][9][10][11][12][13][14][15][16][17].…”