Thermal stability and non-isothermal crystallization kinetics of Pd82Si18 amorphous ribbon
Thermal stability and non-isothermal crystallization kinetics of Pd82Si18 amorphous ribbon
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DOI：
10.1063/1.4985664
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发表时间：
2017-06
期刊：
影响因子：
1.6
通讯作者：
Wang Xutong;M. Zeng;N. Nollmann;G. Wilde;Jiang Wang;Chengying Tang
中科院分区：
文献类型：
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作者：
Wang Xutong;M. Zeng;N. Nollmann;G. Wilde;Jiang Wang;Chengying Tang
采用熔融纺丝法制备了快淬Pd 82 Si 18薄带。采用差示扫描量热法研究了Pd_（82）Si_（18）非晶薄带的热稳定性和非等温晶化动力学。通过X射线衍射和透射电子显微镜对其结构进行了研究。采用Kissinger方法计算了非等温晶化过程的激活能，并通过局域激活能和局域Avrami指数研究了非等温晶化过程中的形核和长大过程。采用Kissinger方法计算了Pd_（82）Si_（18）非晶薄带的平均激活能为330.672 kJ/mol，表明其具有较高的热稳定性。采用Kissinger-Akahira-Sunose方法确定了玻璃带的局域激活能，并基于Johnson-Mehl-Avrami模型得到了局域Avrami指数。计算得到的局部活化能在结晶柱分数为0.3时达到最大值，随后又减小，表明局部活化能随结晶柱分数的增大而增大。
Rapidly quenched Pd82Si18 ribbon was prepared by melt spinning. The thermal stability and non-isothermal crystallization kinetics of Pd82Si18 amorphous ribbon were investigated by differential scanning calorimeter measurements. Its structure was investigated by X-ray diffraction and transmission electronic microscopy. The activation energy was calculated by the Kissinger method, and the nucleation and growth during non-isothermal crystallization were investigated by the local activation energy and local Avrami exponent. The average activation energy for Pd82Si18 amorphous ribbon based on the Kissinger method is 330.672 kJ/mol, indicating that it has high thermal stability. The local activation energy of the glass ribbon was determined by the Kissinger–Akahira–Sunose method, and the local Avrami exponent was obtained based on the Johnson–Mehl–Avrami model. The calculated local activation energy increases to a maximum when the crystallization column fraction reaches 0.3, and it then decreases, which shows t...