Nucleation of supercooled Co melts under a high magnetic field

The nucleation behavior of undercooled Co melts under a strong static magnetic field up to 12 T was investigated using a glass fluxing technique in a superconductor magnet. Due to the strong magnetic field effect, our results show that the undercooled Co melt is separated into two sharp needle like parts before solidification, showing two consecutive recalescence peaks. The application of magnetic field leads to the variations of nucleation undercooling. The mean undercooling of the supercooled liquid is shown almost keep constant independent of the magnetic field, whereas, the maximum temperature during recalescence is found to be strongly depressed by the applied magnetic field. The effects of magnetic field on nucleation and subsequent recalescence process are interpreted based on the thermal dynamics and kinetics analysis of undercooled Co melts with response to high magnetic field.