低纯度原料制备铁基非晶合金的形成能力和磁学性能

摘要

采用低纯度原料制备的(Fe74Nb6B20)100–xCrx(x=1,3,5)非晶合金具有高的玻璃形成能力(GFA)和良好的软磁性能.铬含量的增加并未显著影响合金的玻璃化转变温度和晶化起始温度,然而其使液相线温度显著增加.(Fe74Nb6B20)100–xCrx(x=1,3,5)合金的过冷液相区宽度(?Tx),Tr和 γ 分别为50~54 K,0.526~0.538和0.367~0.371,比未添加铬的Fe-Nb?B合金的玻璃形成能力要强.(Fe74Nb6B20)100–xCrx非晶合金软磁性能优异,其饱和磁感应强度为139~161 A·m2/g,矫顽力为30.24~58.90 A/m.制备得到的Fe?Nb?B?Cr非晶合金的玻璃形成能力高、软磁性能优异且成本低廉,是一款适用于工程应用的软磁材料.%Fe-based metallic glasses of (Fe74Nb6B20)100-xCrx (x=1, 3, 5) with high glass forming ability (GFA) and good magnetic properties were prepared using low-purity raw materials. Increasing Cr content does not significantly change glass transition temperature and onset crystallization temperature, while it enhances liquidus temperature. The addition of Cr improves the GFA of the (Fe74Nb6B20)100-xCrx glassy alloys compared to that in Cr-free Fe-Nb-B alloys, in which the supercooled liquid region (?Tx), Trg and γ are found to be 50-54 K, 0.526-0.538, and 0.367-0.371, respectively. The (Fe74Nb6B20)100-xCrx glassy alloys exhibit excellent soft magnetic properties with high saturation magnetization of 139-161 A·m2/kg and low coercivity of 30.24-58.9 A/m. Present Fe-Nb-B-Cr glassy alloys exhibiting high GFA as well as excellent magnetic properties and low manufacturing cost make them suitable for magnetic components for engineering application.