at％合金晶化动力学

 ａｔ％非晶合金晶化动力学。在恒加热速率晶化曲线上，随升温率在１～４０Ｋ／ｍｉｎ范围变化，分别出现３～４个放热峰。利用Ｋｉｓｉｎｇｅｒ法，Ｏｚａｗａ法和Ａｒｈｅｎｉｕｓ法分别计算了晶化激活能，认为Ａｌ８３Ｙ１０Ｎｉ７非晶合金在Ａｌ－Ｙ－Ｎｉ系有较高的结构稳定性，晶化时第一个放热峰晶化相的等温晶化动力学在０. １５＜ｘ＜０. ８５范围内符合Ｊ－Ｍ－Ａ方程，Ａｖｒａｍｉ指数ｎ＝２. ５；引用阶段Ａｖｒａｍｉ指数和阶段激活能，研究了等温晶化过程中不同阶段的形核和长大行为。

at% AMORPHOUS ALLOYS

at% amorphous alloys prepared by melt spinning is studied by differential scanning calorimetry. Three or four stages of transformation from amorphous to equilibrium state can be distinguished at heating rate 1～40K/min. Apparent activation energies are calculated according to Kissinger method, Ozawa method and Arrkenius equation. An amorphous phase with high structural stability is obtained in the vicinity of Al83Y10Ni7. The isothermal crystallization kinetics of the first stage, ranged 0. 15～0. 85, is found to be in agreement with John-Mell-Avrami equation with n=2. 5. Nucleation and growth during isothermal crystallization of the first stage of Al83Y10Ni7 amorphous are approached by introducing the concepts of local Avrami exponent and local activation energy.