连续超短电脉冲促进非晶晶化的物理机理

对非晶Fe₇₈Si₉B₁₃合金进行了连续高密度超短脉冲电流处理.处理时采取两种制度：1.脉冲频率和作用时间不变，电流密度不断增加；2.电流密度和作用时间恒定，脉冲频率不断增加.用穆斯堡尔谱学等技术研究试样在电脉冲处理后的晶化结构.结果表明，随电流密度、脉冲频率不断增加，非晶的晶化形核率显著增加. 关键词：

THE PHYSICAL MECHANISM OF PROMOTED AMORPHOUS CRYSTALLIZATION BY MULTIPLE ULTRASHORT ELECTROPULSING

Amorphous Fe₇₈Si₉B₁₃ specimens have been treated by multiple ultrashort electropulsing with a high current density. The treatment conditions were：1.Keeping the pulse frequency and acting time constant, the current density uninterrupted increases. 2.The pulse frequency increases continuously under constant current density and acting time. The crystallized structures of specimens after electropulsing were investigated by Mssbauer spectroscopy. The results show that the nucleation rate of base metal phase in amorphous specimens increases obviously with the increase of current density and pulse frequency.