Abstract The changes of solidified structures of Sb-4.8wt.%Mn hypoeutectic alloy under uniform and gradient magnetic fields were examined. It was found that the primary Sb phase in the alloy exhibited a change in growth behavior from a faced to non-faced one or from a non-faced to faced one. The faced/non-faced or non-faced/faced transition was found to be dependent on cooling rate and magnetic flux density. It was also found that the size of the Sb particles increased at first and then decreased with increasing magnetic flux density under uniform magnetic fields. Furthermore, the size of the Sb particles at a positive magnetic field gradient was found to be smaller than one at a negative magnetic field gradient when imposed upon magnetic field gradients with small absolute values of the product of the magnetic field flux density and its gradient. Thermal analyses of specimens indicated that the application of a high magnetic field decreased the undercooling of the primary arrest and the growth velocity of the primary Sb phase.The experimental results show that high magnetic fields can be used to control the morphology of the solidified structure and the size of the primary Sb phase in Mn-Sb hypoeutectic alloy.
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