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磁致非晶合金納米晶化及軟磁性的優(yōu)化
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國家自然科學(xué)基金（50771025）


Nano-Crystallization of Amorphous Alloy by Magnetic Pulsing and Optimization of Soft Magnetic Properties
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    摘要:

    采用低頻脈沖磁場對非晶合金Fe73.5Cu1Nb3Si13.5B9進(jìn)行處理，用穆斯堡爾譜和透射電子顯微鏡分析了脈沖磁場處理前后非晶合金樣品的微結(jié)構(gòu)。結(jié)果表明，脈沖磁場處理致非晶合金在室溫下發(fā)生了初始納米晶化。利用交變梯度磁強(qiáng)計(jì)、自制磁致伸縮系數(shù)測量儀測量低頻脈沖磁場處理前后樣品的矯頑力Hc、飽和磁化強(qiáng)度Ms、起始磁導(dǎo)率μi和磁致伸縮系數(shù)λ。結(jié)果顯示，低頻脈沖磁場處理后樣品的μi整體增大，Hc、λs總體低于制備態(tài)非晶合金，這表明低頻脈沖磁場處理優(yōu)化了非晶合金的綜合軟磁性能，樣品軟磁性優(yōu)化程度與脈沖磁場處理參數(shù)有關(guān)，脈沖頻率f=30 Hz、作用時(shí)間t=4 min不變，脈沖磁場強(qiáng)度Hp=250×79.6 A/m處理參數(shù)下，樣品的軟磁性能最佳。

    Abstract:

    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 Hc 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 Hp=250×79.6 A/m, pulsating frequency f =30 Hz and disposing time t=4 min.

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郭 紅,晁月盛,張 雷.磁致非晶合金納米晶化及軟磁性的優(yōu)化[J].稀有金屬材料與工程,2013,42(6):1236~1240.[Guo Hong, Chao Yuesheng, Zhang Lei. Nano-Crystallization of Amorphous Alloy by Magnetic Pulsing and Optimization of Soft Magnetic Properties[J]. Rare Metal Materials and Engineering,2013,42(6):1236~1240.]
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  • 收稿日期:2012-06-25
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