Grain refinement in bulk undercooled Fe81Ga19 magnetostrictive alloy

High undercoolings up to 305 K have been successfully achieved in the bulk Fe81Ga19 magnetostrictive alloy melts by means of glass fluxing combined with superheating cycling method. Microstructural evolution of Fe81Ga19 alloy is investigated systematically with respect to different undercoolings. The results of grain refinement are interpreted in terms of dendrite remelting and recrystallization mechanism, respectively.