Magnetic Properties and Structure after Crystallization of Fe80-xB20Nbx (x=4, 6, 10) Metallic Glasses

The ferromagnetic Fe-based amorphous alloys were studied due to properties for soft magnetic applications.Depending on different Nb addition, the formation of crystalline phases after annealing of amorphous Fe80-xB20Nbx (x = 4, 6, 10) alloys was studied.The crystallization products as well as the phase structure were determined using the Mössbauer spectrometry combined with differential scanning calorimetry and magnetic measurements.The addition of Nb caused a shift of crystallization process towards higher temperatures and induced changes in coercive force and decreased the saturation magnetization.It was found that Nb addition changed the crystallization process from single crystallization for Fe76B20Nb4 alloy to binary crystallization in the Fe74B20Nb6 and Fe70B20Nb10 glasses.The annealing process at the onset crystallization temperature induced complex phase formation including the α-Fe, Fe3B, and Fe2B phases for alloys x = 4, 6.