PDF《Trans. Nonferrous Met. Soc. China》

800 kA/m at room temperature.

3 Results and discussion Figure

1 shows the XRD patterns of the Fe75Zr3Si13B9 alloy powders by MA with different milling time. The patterns show gradually broad peak with the milling time prolonging, which indicate a typical amorphous halo peak. The diffraction peak disappeared after milling for

20 h at the 2θ angle between 64° and 67°, indicating the formation of amorphous. After milling for

30 h, the halo peaks of amorphous alloy powder were remarkable and no distinct crystalline peaks could be seen in the XRD patterns, suggesting that the alloy powders are fully amorphous. With the increase of milling time, the sharp diffraction peaks of crystal phases were observed at the 2θ angle of about 45°, indicating that increasing the milling time has disadvantage for the Fe75Zr3Si13B9 alloy powders to form amorphous ones. The best milling time is

30 h in the present ball-milling process. Fig.

1 XRD patterns of Fe75Zr3Si13B9 alloy powders with different milling time Thermal behavior of alloy powders milled for

30 h is shown in Fig. 2. The amorphous alloy powders have remarkable exothermic peak of crystallization. The glass transition temperature Tg is 753.37 K, the onset crystallization temperature Tx is 823.61 K, the peak temperature Tp is 833.62 K, and the super-cooled liquid Xing-hua WANG, et al/Trans. Nonferrous Met. Soc. China 24(2014) 712?717

714 region (ΔTx=Tx?Tg) is about 70.24 K. This indicates that the amorphous Fe75Zr3Si13B9 alloy powders exhibit good thermal stability before crystallization. Based on the characteristic temperatures of the amorphous powders, six different sintering tempe........