摘要
采用低频脉冲磁场对非晶合金Fe73.5Cu1Nb3Si13.5B9进行处理,用穆斯堡尔谱和透射电子显微镜分析了脉冲磁场处理前后非晶合金样品的微结构。结果表明,脉冲磁场处理致非晶合金在室温下发生了初始纳米晶化。利用交变梯度磁强计、自制磁致伸缩系数测量仪测量低频脉冲磁场处理前后样品的矫顽力Hc、饱和磁化强度Ms、起始磁导率μi和磁致伸缩系数λ。结果显示,低频脉冲磁场处理后样品的μi整体增大,Hc、λs总体低于制备态非晶合金,这表明低频脉冲磁场处理优化了非晶合金的综合软磁性能,样品软磁性优化程度与脉冲磁场处理参数有关,脉冲频率f=30Hz、作用时间t=4min不变,脉冲磁场强度Hp=250×79.6A/m处理参数下,样品的软磁性能最佳。
Amorphous alloy Fe73.5Cu1Nb3Si13.5B9 was treated by low frequency pulsating magnetic field. The microstructure of the amorphous alloy sample was analyzed by M ssbauer spectroscopy and TEM. The results show that the initial nano-crystallozation occurs in the ample during the pulsating magnetic field treatment at room temperature. By means of the alternating gradient magnetic meter and self-made magnetostrictive coefficient measuring instrument, coercive force Hc , saturation magnetization strength Ms , initial superconducting rate μi , and magnetostrictive coefficient λs of the samples were measured before and after low frequency pulsating magnetic field treatment. Results show that the overall μi increases after low frequency pulsating magnetic field treatment, while H c and λs are smaller than those of the as-prepared amorphous alloy. It indicates that low frequency pulsating magnetic field treatment can optimize comprehensive soft magnetic properties of amorphous alloys, and the optimization degree of soft magnetic properties is relevant with the parameters of plused magnetic field. The soft magnetic properties of the sample reach the best when the pulsating magnetic field strength H p =250×79.6 A/m, pulsating frequency f =30 Hz and disposing time t=4 min.
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
2013年第6期1236-1240,共5页
Rare Metal Materials and Engineering
基金
国家自然科学基金(50771025)
关键词
低频脉冲磁场
纳米晶化
饱和磁致伸缩系数
low frequency pulsating magnetic field
nano-crystallization
magnetostriction coefficient
