Structural, microstructural and magnetic properties of amorphousanocrystalline Ni_(63)Fe_(13)Mo_4Nb_(20) powders prepared by mechanical alloying

摘要

This paper focuses on the magnetic, structural and microstructural studies of amorphousanocrystalline Ni_(63)Fe_(13)Mo_4Nb_(20) powders prepared by mechanical alloying. The ball-milling of Ni, Fe, Mo and Nb powders leads to alloying the element powders, the nanocrystalline and an amorphization matrix with Mo element up to 120 h followed by the strain and thermal-induced nucleation of a single nanocrystalline Ni-based phase from the amorphous matrix at 190 h. The results showed that the saturation magnetization decreases as a result of the electronic interactions between magnetic and non-magnetic elements and finally increases by the partial crystallization of the amorphous matrix. The coercive force increases as the milling time increases and finally decreases due to sub-grains formation.