The FeZrB amorphous alloys for simulating the intergranular amorphous phase in the nanocrystalline Fe 89 Zr 7B 4 soft magnetic materials were obtained by mechanical alloying of a mixture of elemental Fe, Zr and ...The FeZrB amorphous alloys for simulating the intergranular amorphous phase in the nanocrystalline Fe 89 Zr 7B 4 soft magnetic materials were obtained by mechanical alloying of a mixture of elemental Fe, Zr and B powders for 25 h. It is shown that the Curie temperature of the simulated intergranular phase alloy is much lower than that of the intergranular phase with the same chemical composition in the nanocrystalline Fe 89 Zr 7B 4 alloy. The possible mechanism is mainly due to the strong ferromagnetic exchange force among the nanocrystalline α Fe grains.展开更多
The annealing effects on the magnetic properties and structures of Co_(66)Fe_(4)Mo_(2)Si_(16)B_(12) amorphous alloy were studied by means of ballistic method and x-ray diffraction technique respectively.During the iso...The annealing effects on the magnetic properties and structures of Co_(66)Fe_(4)Mo_(2)Si_(16)B_(12) amorphous alloy were studied by means of ballistic method and x-ray diffraction technique respectively.During the isothermal annealing at Ta=460℃,the initial permeabilityμi of the sample increased at first,then decreased with the annealing time ta and exhibited a maximum at about ta=45 min.Meanwhile,it was found that magnetostrictionλs changed with ta and ran through zero at about ta=45min.The x-ray diffraction results showed that the sample was still in an amorphous state in the whole 460℃ isothermal annealing process(ta=0-120min).After the annealing temperature increased to 480℃,α-Fe(Co,Si)phase began to precipitate,then,Co_(3)Mo crystallites and other phases were formed subsequently at 500℃.The results of magnetic measurement indicated that the formation of any crystalline phases should lead to the deterioration of magnetic properties.展开更多
文摘The FeZrB amorphous alloys for simulating the intergranular amorphous phase in the nanocrystalline Fe 89 Zr 7B 4 soft magnetic materials were obtained by mechanical alloying of a mixture of elemental Fe, Zr and B powders for 25 h. It is shown that the Curie temperature of the simulated intergranular phase alloy is much lower than that of the intergranular phase with the same chemical composition in the nanocrystalline Fe 89 Zr 7B 4 alloy. The possible mechanism is mainly due to the strong ferromagnetic exchange force among the nanocrystalline α Fe grains.
基金Supported by the National Natural Science Foundation of China under Grant No.59471019.
文摘The annealing effects on the magnetic properties and structures of Co_(66)Fe_(4)Mo_(2)Si_(16)B_(12) amorphous alloy were studied by means of ballistic method and x-ray diffraction technique respectively.During the isothermal annealing at Ta=460℃,the initial permeabilityμi of the sample increased at first,then decreased with the annealing time ta and exhibited a maximum at about ta=45 min.Meanwhile,it was found that magnetostrictionλs changed with ta and ran through zero at about ta=45min.The x-ray diffraction results showed that the sample was still in an amorphous state in the whole 460℃ isothermal annealing process(ta=0-120min).After the annealing temperature increased to 480℃,α-Fe(Co,Si)phase began to precipitate,then,Co_(3)Mo crystallites and other phases were formed subsequently at 500℃.The results of magnetic measurement indicated that the formation of any crystalline phases should lead to the deterioration of magnetic properties.
