Crystal growth of high magnetostrictive polycrystalline Fe81Ga19 alloys

摘要: Abstract High magnetostrictive Fe 81 Ga 19 alloy was prepared by induction heating zone melting method. The microstructure, solute partition behaviour, orientation evolution and magnetostriction are investigated. During the crystal growth process, initial small grains gradually grow into large columnar crystals, solid–liquid interface shows slightly concave morphology. equilibrium coefficient ( k 0 ), effective e ) solution diffusion D calculated to be 0.74, 0.76 1.04×10 −9  m 2 /s, respectively. In steady stage, composition distribution of FeGa rod is uniform with average level about 18.50 at% Ga, which close nominal composition. deviation 〈001〉 from axial direction evolves 8° 3° along direction, corresponding increases 180 ppm final 305 ppm.