Non-isothermal Diferential Scanning Calorimetry Studies on Nanocrystallization Kinetics of Fe81Si3.5B13.5C2 Amorphous Alloy
The nanocrystallization kinetics of the Fe81Si3.5B13.5C2 amorphous alloy was investigated by differential scanning calorimetry (DSC). The apparent activation energy Ea, as well as the nucleation and growth kinetic parameters has been calculated by Kissinger and Ozawa methods. The changeable activation energy Ea with crystalline fraction α was obtained by the expended Friedman method without assuming the kinetic model function, and the average value of Ea was 364±20 kJ/mol. It was shown that the crystallization mechanism of initial stage (0<α<0.7) of the transformation was bulk crystallization with two and three dimensional nucleation graining growth which was controlled by diffusion. For the middle stage (0.7<α<0.9), the crystallization mechanism is surface crystallization with one dimensional nucleation graining growth at a near-zero nucleation rate. In the final stage(α>0.9), the local Avrami exponents rose anomalously from 1.4 to about 2.0.
crystallization kinetics amorphous Fe81Si3.5B13.5C2 alloy non-isothermal differential scanning calorimetry
Zhang Yu Lu Wei Yan Biao Wang Yuxin Yang Ying
School of Materials Science and Engineering, Tongji University, Shanghai 201804, China Shanghai Key Lab. of D&A for Metal-Functional Materials, Shanghai 201804, China
国际会议
11th IUMRS International Conference in Asia(第十一届国际材联亚洲材料大会 IUMRS-ICA 2010)
青岛
英文
180-185
2010-09-25（万方平台首次上网日期，不代表论文的发表时间）