Effect of interdendritic thermoelectric magnetic convection on evolution of tertiary dendrite during directional solidification

The Al-4.5 wt%Cu alloy has been directionally solidified under a high static magnetic field up to 6 T. A novel α-Al dendrite morphology was presented when the <001> primary trunk aligned to the magnetic field and temperature gradient. It is observed that tertiary dendrites grew asymmetrically on secondary arms in the plane perpendicular to the primary trunk, and a pinwheel-like pattern formed. A numerical simulation was performed using...