Influence of rotating magnetic field on the microstructure and phase content of Ni-Al alloy

摘要

Rotating magnetic field is introduced in the production process of Ni-Al precursor alloy of skeletal Ni catalyst. The results showed that the big dendrites of Al_3Ni_2 disappeared, the size of Al_3Ni_2 decreased from 64.5 μm to 37.2 and 35.5μm, phase content of Al_3Ni_2 decreased while Al_3Ni increased after applying field current of 80 A and 140 A, respectively. The change of phase content is probably caused by the increase of surface area between the Al_3Ni_2 phase and fluid which is favorable to the peritectic reaction.