摘要
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.
基金
Supported by the National Natural Science Foundation of China under Grant No.59471019.
