金属学报  2007, Vol. 42 Issue (1): 91-95

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等温退火和脉冲电流处理对Fe73.5Cu1Nb3Si13.5B9非晶薄带组织和显微硬度的影响

姚可夫;邱胜宝

清华大学

The influences of pulsing current and isothermal annealing on the microstructure and micro-hardness of Fe73.5Cu1Nb3Si13.5B9 amorphous ribbons

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清华大学

姚可夫; 邱胜宝 . 等温退火和脉冲电流处理对Fe73.5Cu1Nb3Si13.5B9非晶薄带组织和显微硬度的影响[J]. 金属学报, 2007, 42(1): 91-95 .
, . The influences of pulsing current and isothermal annealing on the microstructure and micro-hardness of Fe73.5Cu1Nb3Si13.5B9 amorphous ribbons[J]. Acta Metall Sin, 2007, 42(1): 91-95 .

摘要 参考文献 相关文章 Metrics 全文: PDF(270 KB)   摘要: 等温退火和高强脉冲电流处理都能使Fe73.5Cu1Nb3Si13.5B9 (at.%)非晶薄带的显微组织和显微硬度发生显著变化。实验结果表明，高强脉冲电流处理能使Fe73.5Cu1Nb3Si13.5B9非晶薄带发生显著的低温短时晶化。在初始阶段，脉冲电流促进原子迁移，加速原子和原子团扩散，使Fe73.5Cu1Nb3Si13.5B9非晶薄带发生结构弛豫，显微硬度由原始态非晶的8.2 GPa逐渐增加至~9.0 GPa，增幅约为10%。随后发生显著晶化，大量析出纳米尺寸的α-Fe(Si)相，显微硬度则急剧增加至12.4 GPa以上，增幅达~50%。在低于玻璃转变温度100 K的条件下，高强脉冲电流处理Fe73.5Cu1Nb3Si13.5B9非晶合金可在约30秒的时间内即基本完成纳米晶化过程。 关键词 ： 脉冲电流,  纳米晶化,  显微硬度,  等温退火     Abstract：The influence of pulsing current and isothermal annealing on the microstructure and micro-hardness of Fe73.5Cu1Nb3Si13.5B9 amorphous ribbons have been studied. It has been found that Fe73.5Cu1Nb3Si13.5B9 amorphous ribbons can significantly nanocrystallized by pulsing current treatment in a short processing time (within 30 s) at low processing temperature (100 K lower than glass transition temperature). At the early stage of pulsing current treatment, the micro-hardness increases by 10% from 8.2 to 9.0 GPa with respect to the initial ribbons, resulted by the structural relaxation. Then an abrupt increase by 50% from 8.2 to 12.4 GPa of the micro-hardness occur, as a result of the precipitation of abundant α-Fe nanocrystals with an average grain size of 8.5 nm. It indicates that pulsing current treatment is an effective way for the nanocrystallization of the studied amorphous alloy. 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