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中南大学学报(自然科学版)

Journal of Central South University

第31卷    第1期    总第131期    2000年2月

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文章编号:1004-0609(2000)01-0027-05
Fe73.5Cu1Nb3Si13.5B9非晶合金电脉冲处理与等温退火的比较
滕功清1, 晁月盛2

(1. 北京机械工业学院基础部, 北京100085; 2. 东北大学理学院,  沈阳110006)

摘 要: 用直流高密度电脉冲和可比等温退火处理Fe73.5Cu1Nb3Si13.5B9非晶合金,并用XRD,TEM和穆斯堡尔谱等方法进行结构检测。结果表明,在电脉冲作用下,Fe73.5Cu1Nb3Si13.5B9非晶合金在平均温度为420 ℃的条件下发生了纳米晶化,晶化试样中无Fe-B相析出,无DO3型有序结构;晶化总量达30.9%的无序α-Fe(Si) 相的平均尺寸为8~9 nm,按二项式分布计算α-Fe(Si)中Si原子浓度约为17. 6%;面积比 A2.5/A1.6从淬态非晶的0.92增加至0.97,表明尽管发生了体晶化,剩余非晶中的Fe原子磁矩仍保持较强的面内各向异性。与可比温度下的等温退火处理实验结果比较可知,直流高密度电脉冲处理不同于他人报道的闪光退火,亦不同于通常的等温退火,是非晶合金纳米化转变的一种新方法。

 

关键字: Fe73.5Cu1Nb3Si13.5B9非晶合金;电脉冲;纳米晶化

Comparative investigation on amorphous Fe73.5Cu1Nb3Si13.5B9 by electropulsing and isothermal annealing
TENG Gong-qing1, CHAO Yue-sheng2

1. Department of Basic Science,Beijing Institute of Machinery,Beijing 100085, P.R.China;
2. College of Science,Northeastern University,Shenyang 110006, P.R.China

Abstract:The high current density electropulsing and comparable isothermal annealing were used to treat the amorphous Fe73.5Cu1Nb3Si13.5B9 alloy, and the structure of the treated samples was examined using Mossbauer spectroscopy, XRD and TEM. Experimental results showed that nanocrystallization occurs in the amorphous Fe73.5Cu1Nb3Si13.5B9 at the temperature of 420 ℃during electropulsing. No Fe-B phase was observed and no ordered DO3 structure was detected in the crystallized Fe73.5Cu1Nb3Si13.5B9 sample. The disordered α-Fe(Si) phase with grain size of 8~9nm amounts to 30.9%. The Si atom concentration in α-Fe(Si) phase was estimated to be about 17.6% according to calculation based on binomial distribution .Area ratios, A2.5/A1.6, in the as-quenched sample and annealed sample were 0.92, but increased to 0.97 in the residual amorphous phase of the electropulsed sample, showing that the magnetic moment of Fe atoms in the residual amorphous remains the in-plane anisotropy, in spite of bulk nanocrystallization. In contrast with the result by comparable isothermal annealing, it was concluded that the transformation of the amorphous Fe73.5Cu1Nb3Si13.5B9 to nanocrystalline induced by high current density electropulsing is a new method for nanocrystallization of the amorphous alloy, different from the flash annealing method and also from the conventional isothermal annealing method.

 

Key words: amorphous Fe73.5Cu1Nb3Si13.5B9; electro-pulsing; nanocrystallization.

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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