Fe_73.5Cu₁Nb₃Si_13.5B₉非晶合金电脉冲处理与等温退火的比较

来源期刊：中国有色金属学报2000年第1期

论文作者：滕功清 晁月盛

文章页码：27 - 31

关键词：Fe_73.5Cu₁Nb₃Si_13.5B₉非晶合金；电脉冲；纳米晶化

Key words：amorphous Fe_73.5Cu₁Nb₃Si_13.5B₉; electro-pulsing; nanocrystallization.

摘    要：用直流高密度电脉冲和可比等温退火处理Fe_73.5Cu₁Nb₃Si_13.5B₉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，Fe_73.5Cu₁Nb₃Si_13.5B₉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 A_2.5/A_1.6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。

Abstract: The high current density electropulsing and comparable isothermal annealing were used to treat the amorphous Fe_73.5Cu₁Nb₃Si_13.5B₉ 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 Fe_73.5Cu₁Nb₃Si_13.5B₉ at the temperature of 420 ℃during electropulsing. No Fe-B phase was observed and no ordered DO₃ structure was detected in the crystallized Fe_73.5Cu₁Nb₃Si_13.5B₉ 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, A_2.5/A_1.6, 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 Fe_73.5Cu₁Nb₃Si_13.5B₉ 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.