Effect of electric current on the microstructural refinement of pure aluminum

• DOI: 10.1016/j.jmrt.2021.03.040
• Publication Date: 2021-03-18T23:02:58Z
• Authors: Jee Seok Choi; Moonwoo La; DongEung Kim; Kyeong-Hwan Choe; Soong-Keun Hyun; Moon-Jo Kim
• Keywords: Equiaxed crystals; Electric current; Melt flow index; Homogenization; Lorentz force

The effect of electric current on the refinement pure aluminum during solidification was investigated based microstructural observations and numerical simulations. Coarse columnar grains are observed without application direct (DC off), while equiaxed clearly exist under solidification; area fraction zone increased up to 66% current, whereas it is negligible in DC off condition. Also, grain size decreased drastically 221 μm compared that several mm affected by electrical conditions such as intensity duration applied current. flow liquid experimentally from homogenization cooling curves measured at different heights oscillations curves, when solidification. Through analysis, found circulating developed Lorentz force induced a combination density field magnetic flux Moreover, could affect providing additional nuclei through dendrite fragmentation. However, extreme relatively high energy, refining disappear because retardation or remelting nuclei, Joule heating effect. This study proves plays an important role control structure.