Sm_8Fe_(83)Si_2C_5Cu_(0.5)Nb_(1.5)非晶合金的晶化动力学

CRYSTALLIZATION KINETICS OF Sm_8Fe_(83)Si_2C_5Cu_(0.5)Nb_(1.5) AMORPHOUS ALLOY

用差热分析（DTA），结合X射线衍射（XRD）研究了Sm8Fe83Si2C5Cu0.5Nb1.5非晶合金的晶化动力学．结果表明：温度在0～1000℃范围内，该合金的晶化相为α-Fe和Sm2（FeSi）17Cx.α-Fe相的晶化表观激活能为349．53kJ／mol，Sm2（FeSi）17Cx的晶化表观激活能为316．19kJ／mol，两相在晶化初期激活能最小，随晶化量（Xc）的增加激活能增大，当α-Fe相的体积分数为20-50％，Sm2（FeSi）17Cx的体积分数为6-50％时，两相晶化激活能呈极大值。

Crystallization kinetics of Sm8 Fe83 Si2 C5 Cu0. 5 Nb1. 5 amorphous alloy has been studied by DTA and XRD methods. Results show that the crystalline phases in the temperature range of 0-1000℃ in this alloy are α-Fe and Sm2 (FeSt)17Cx The apparent crystallization activation energy of α-Fe phase and Sm2(FeSi)17Cx is 349.53kJ/mol and 316.19kJ/mol respectively. The apparent crystallization aCtivation energy of both α-Fe and Sm2(FeSi)17Cx is the smallest at beginning, and increases with increasing crystallized volume fraction (Xc). When the volume fraction of α-Fe phase is between 0.2 and 0.6, and the volume fraction of Sm2(FeSi)17Cx is between 0.06 and 0.5, their apparent crystallization actiVation energies are the largest.