Effects of Zr on crystallization kinetics of Pr-Fe-B amorphous alloys
来源期刊:中国有色金属学报(英文版)2002年第3期
论文作者:刘建华 李伟 谌岩 关颖
文章页码:466 - 469
Key words:Pr-Fe-B amorphous alloys; Zr; crystallization kinetics; activation energy
Abstract: The effects of Zr on crystallization kinetics of Pr-Fe-B amorphous alloys have been investigated by DTA and XRD methods. It was found that for Pr8Fe86-xZrxB6(x=0, 1, 2) amorphous alloys, the final crystallized mixture is α-Fe and Pr2Fe14B, and the metastable Pr2Fe23B3 phase occurs during crystallization of Pr8Fe86B6 amorphous alloy, not during crystallization of Pr8Fe86-xZrxB6(x=1, 2) amorphous alloys. By analyzing the activation energy of crystallization, the formation of an α-Fe/Pr2Fe14B composite microstructure with a coarse grain size in annealed Pr8Fe86B6 alloy, is attributed to a difficult nucleation and an easy growth for both the α-Fe and Pr2Fe14B in the alloy. The addition of Zr can be used to change the crystallization behavior of the α-Fe phase in Pr-Fe-B amorphous alloy, which is helpful to reduce the grain size for the α-Fe phase.