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The crystallization,microstructure,and soft magnetic properties of Fe_(52)Co_(34)Hf_7B_6Cu_1 alloy are studied.Amorphous Fe_(52)Co_(34)Hf_7B_6Cu_1 alloys are first treated by a pulsed magnetic field with a medium frequency,and then annealed at 100℃-400℃for 30 min in a vacuum.The rise in temperature during the treatment by a pulsed magnetic field is measured by a non-contact infrared thermometer.The soft magnetic properties of specimens are measured by a vibrating sample magnetometer(VSM).The microstructure changes of specimens are observed by a Mossbauer spectroscopy and transmission electron microscope(TEM).The results show the medium-frequency pulsating magnetic field will promote nanocrystallization of the amorphous alloy with a lower temperature rise.The nanocrystalline phase isα-Fe(Co) with bcc crystal structure,and the grain size is about 10 nm.After vacuum annealing at 100℃for 30 min,scattering nanocrystalline phases become more uniform,the coercive force and the saturation magnetization of the specimens are 41.98 A/m and 185.15 emu/g.
The crystallization, microstructure, and soft magnetic properties of Fe_ (52) Co_ (34) Hf_7B_6Cu_1 alloys are studied.Amorphous Fe_ (52) Co_ (34) Hf_7B_6Cu_1 alloys are first treated by a pulsed magnetic field with a medium frequency, and then annealed at 100 ° C to 400 ° C for 30 min in a vacuum. The rise in temperature during the treatment by a pulsed magnetic field is measured by a non-contact infrared thermometer. The soft magnetic properties of the specimens are measured by a vibrating sample magnetometer (VSM The microstructure changes of specimens are observed by a Mossbauer spectroscopy and transmission electron microscope (TEM). The results show the medium-frequency pulsating magnetic field will promote nanocrystallization of the amorphous alloy with a lower temperature rise. The nanocrystalline phase is alpha-Fe (Co) with bcc crystal structure, and the grain size is about 10 nm. After vacuum annealing at 100 ° C for 30 min, the scattering nanocrystalline phases become more uniform, the coercive force and the saturati on magnetization of the specimens are 41.98 A / m and 185.15 emu / g.