Fe-Ni-Mo-(Si)-B非晶的晶化及纳米晶合金磁性的研究

STUDY ON THE CRYSTALLIZATION OF Fe-Ni-Mo-(Si)-B AMORPHOUS ALLOYS AND MAGNETIC PROPERTIES OF NANOCRYSTALLINE ALLOYS

对Ｆｅ４０Ｎｉ３８ＭＯ４Ｂ１８， Ｆｅ３８Ｎｉ３５ＭＯ４Ｓｉ５Ｂ１８和 Ｆｅ３９Ｎｉ３６ＭＯ２Ｓｉ５Ｂ１８（均为原子分数，％）三种非晶合金在 ４００－５２０℃等温退火１ｈ后的晶化行为进行了研究，并研究了 Ｆｅ４０Ｎｉ３８ＭＯ４Ｂ１８合金的磁性．结果表明： Ｆｅ４ＯＮｉ３８ＭＯ４Ｂ１８；合金经４３０－４５０℃温度退火后，在非晶基体上析出了 ｆｃｃ γ－（Ｆｅ，Ｎｉ）固溶体，平均晶粒尺寸Ｄ接近 １０ｎｍ，具有很好的软磁性能；当退火温度Ｔａ ４７０℃时，除析出（Ｆｅ，Ｎｉ）固溶体外又析出了Ｆｅ３ Ｂ，Ｆｅ２３Ｂ６和Ｍｉ２Ｂ化合物，磁性显著下降．Ｆｅ３８ Ｎｉ３５ ＭＯ４Ｓｉ５Ｂ１８和Ｆｅ３９Ｎｉ３６ＭＯ２Ｓｉ５Ｂ１８两种非晶合金退火后，析出相由－（Ｆｅ，

Crystallization behaviors of Fe40Ni38Mo4B18, Fe38Ni35Mo4Si5B18 and Fe39Ni36Mo2Si5B18(atomic fraction, %) amorphous alloys, as well as magnetic properties of the Fe40Ni38Mo4B18, alloy annealed in the temperature range from 400℃ to 520℃ for 1 h have been investigated. The results show that for the samples of Fe40Ni38Mo4B18 annealed in the temperature range of 430-450℃, a single fee phase with composition near Ni3Fe and grain size of about 10 um precipitates in the amorphous matrix, and exhibits good soft magnetic properties, and when annealed at Ta>470℃, the magnetic properties drop rapidly, which is mainly due to the formations of Fe-B and Ni-B compounds. For the samples of Fe38Ni35Mo4Si5B18 and Fe39Ni36Mo2Si5B18, fcc phace and Fe-B compounds precipitate almost simultaneously in amorphous matrix by annealing treatment.