摘要
通过差热分析仪（DTA）研究了非晶态合金Mg65Cu25Y10的晶化动力学过程，根据Kissinger峰移法和Arrhenius方程计算了其晶化激活能，发现等温晶化动力学在晶化体积转变分数x为0．15～0．85范围内符合J-M-A方程，493K下的平均Avrami指数n大于3，而在553K和623K下的Avrami指数n约为2。运用阶段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过程。
Crystallization kinetics of Mg65Cu25Y10 amorphous alloy is studied by differential thermal analysis （DTA） ; activation energy of crystallization is calculated according to Kissinger peak-shifting method and Arrhenius equation. The isothermal crystallization kinetics, while the crystallization-transition volume fraction, x= 0.15-0. 85 , is found to be in agreement with John-Mehl-Avrami equation. Its average Avrami exponent is n〉3 at 493 K, and n≈2 at 553 K and 623 K. The grain nucleation and the growth of Mg65Cu25Y10 alloy during isothermal crystallization are also studied by introducing concepts of the local Avrami exponent and the local activation energy of crystallization.
出处
《南京航空航天大学学报》
EI
CAS
CSCD
北大核心
2006年第4期474-478,共5页
Journal of Nanjing University of Aeronautics & Astronautics
基金
江西省教育厅科技攻关(赣财教第18号)资助项目
关键词
非晶态合金
晶化动力学Avrami指数
晶化激活能
镁合金
amorphous alloy
crystallization kinetics
Avrami exponent
activation energy of crystallization
Mg-based alloy
