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用单辊快淬法制备Fe74Nb6-xYxB20(x=3 at%、4 at%、5 at%)非晶合金,取不同的温度对合金热处理,利用差热分析仪(DTA)、X射线衍射仪(XRD)、透射电子显微镜(TEM)、振动样品磁强计(VSM)研究了合金的非晶形成能力、晶化过程和磁性能。结果表明,添加微量Y元素提高了合金的非晶形成能力,当Y含量为5 at%时,Fe74Nb1Y5B20非晶合金过冷液相区具有最大值、△Tx=63℃。Fe74Nb6-xYxB20(3 at%、4 at%、5 at%)合金的晶化过程为:非晶→非晶+α-Fe+Fe23B6+Fe2B→α-Fe+Fe23B6+Fe2B。随着退火温度的升高,3种合金Fe74Nb6-xYxB20(x=3 at%、4 at%、5 at%)饱和磁化强度MS变化趋势是一致的,在670℃退火后3种合金MS均达到最大、分别为128、122、134 A·m2·kg-1,矫顽力Hc为2.96、3.12、3.36 kA·m-1,在750℃退火后,Hc快速增大。
The alloy Fe74Nb6-xYxB20 (x = 3 at%, 4 at%, 5 at%) was prepared by single roll rapid quenching method. The alloy was heat treated at different temperatures. The samples were characterized by DTA, XRD, (XRD), transmission electron microscopy (TEM) and vibrating sample magnetometer (VSM) were used to investigate the amorphous formation, crystallization and magnetic properties of the alloy. The results show that the addition of a trace amount of Y element increases the amorphous formation ability of the alloy. When the Y content is 5 at%, the supercooled liquid region of Fe74Nb1Y5B20 amorphous alloy has the maximum value, △ Tx = 63 ℃. The crystallization process of Fe74Nb6-xYxB20 alloy (3 at%, 4 at%, 5 at%) is as follows: amorphous → amorphous + α-Fe + Fe23B6 + Fe2B → α-Fe + Fe23B6 + Fe2B. With the increase of annealing temperature, the trend of saturation magnetization (MS) of the three alloys Fe74Nb6-xYxB20 (x = 3 at%, 4 at%, 5 at%) is consistent. The maximum, respectively, 128,122,134 A · m2 · kg-1, coercivity Hc 2.96,3.12,3.36 kA · m-1, after annealing at 750 ℃, Hc rapidly increased.