The solidification microstructure of Fe_(70)Cr_(18)Mo_2Si_1B_9 single-roll quenched ribbons with dif- ferent rotating speed of roller and under different atmosphere conditions was investigated. Apart from usual crysta...The solidification microstructure of Fe_(70)Cr_(18)Mo_2Si_1B_9 single-roll quenched ribbons with dif- ferent rotating speed of roller and under different atmosphere conditions was investigated. Apart from usual crystallization by homogeneous and heterogeneous nucleation,it was found that α-iron cohnnnar grains with strong preferred orientation formed beneath free surface and that spheres of α-iron single coastal with a size of several μm up to 20μm,which have rarely been reported,appeared inside the ribbons.There was experirnental evidence suggesting that clusters of metal atoms formed from fluctuation in early undercooled liquid might play a role as pre-existed nuclei and,in fact,control the formation of amorphous for this alloy.展开更多
The giant magnetoimpedance(GMI)effect in as-quenchedFe_89-xZr_7B_4Cu_x(x=1.0-2.5)ribbons is reported. The as-quenchedFe_89-xZr_7B_4Cu_x(x=1.0-2.5)ribbons were prepared by the vacuummelt-spun processes with the quenchi...The giant magnetoimpedance(GMI)effect in as-quenchedFe_89-xZr_7B_4Cu_x(x=1.0-2.5)ribbons is reported. The as-quenchedFe_89-xZr_7B_4Cu_x(x=1.0-2.5)ribbons were prepared by the vacuummelt-spun processes with the quenching speed of 37 m/s. The magne-Toimpedance measurement were performance at room temperature, wherethe current flow through the length of the ribbons in the directionParallel to the dc fields. results show that values Z(impedance),R(resistance)for both H = 0 A/m and H = 5 127 A/m Increases withincreasing ac frequency. This can be explained by the skin effectmechanism.展开更多
文摘The solidification microstructure of Fe_(70)Cr_(18)Mo_2Si_1B_9 single-roll quenched ribbons with dif- ferent rotating speed of roller and under different atmosphere conditions was investigated. Apart from usual crystallization by homogeneous and heterogeneous nucleation,it was found that α-iron cohnnnar grains with strong preferred orientation formed beneath free surface and that spheres of α-iron single coastal with a size of several μm up to 20μm,which have rarely been reported,appeared inside the ribbons.There was experirnental evidence suggesting that clusters of metal atoms formed from fluctuation in early undercooled liquid might play a role as pre-existed nuclei and,in fact,control the formation of amorphous for this alloy.
文摘The giant magnetoimpedance(GMI)effect in as-quenchedFe_89-xZr_7B_4Cu_x(x=1.0-2.5)ribbons is reported. The as-quenchedFe_89-xZr_7B_4Cu_x(x=1.0-2.5)ribbons were prepared by the vacuummelt-spun processes with the quenching speed of 37 m/s. The magne-Toimpedance measurement were performance at room temperature, wherethe current flow through the length of the ribbons in the directionParallel to the dc fields. results show that values Z(impedance),R(resistance)for both H = 0 A/m and H = 5 127 A/m Increases withincreasing ac frequency. This can be explained by the skin effectmechanism.
