非晶态Fe-B-Si合金退火转变过程动力学特征

KINETIC CHARACTERS OF ANNEALING TRANSFORMATION IN AMORPHOUS Fe_B_Si ALLOYS

用Ａｒｈｅｎｉｕｓ公式和Ｋｉｓｉｎｇｅｒ方程对非晶态Ｆｅ＿Ｂ＿Ｓｉ合金的退火转变过程进行了系统的动力学分析．在低温结构弛豫阶段，Ｆｅ＿Ｂ＿Ｓｉ合金的结构弛豫激活能随温度的升高而单调增大；在晶化初期，非晶态Ｆｅ＿Ｂ＿Ｓｉ合金的表观晶化激活能随温度的升高而降低，在ＤＳＣ曲线上α＿Ｆｅ转变最大速率处出现转折；温度高于转折点后，晶化激活能随温度的升高而单调增大．

Arrhenius formula and Kissinger equation are used to study systematically the kinetics of the annealing transformation of amorphous Fe_B_Si alloys. Activation energies for structural relaxation of amorphous Fe_B_Si alloys increase monotonously with annealing temperature during the low_temperature annealing process. At the initial stage of crystallization, the apparent activation energies for crystallization of Fe_B_Si metallic glassy ribbons first decrease and then increase monotonously with annealing temperature with a minimum activation energy occurring at the peak temperature for α_Fe transformation in DSC curves.