纳米晶氢化态镁及镁合金粉末的脱氢动力学研究

Dehydriding Kinetics of Nanocrystalline Hydrided Mg and Mg Alloy Powders

摘要:

实验研究了纳米晶氢化态镁及AZ31镁合金粉末的脱氢过程，获得了不同温度下的脱氢动力学数据。通过运用Johnson-Mehl-Avrami (JMA)方程对实验数据进行拟合处理，对两种材料的固态热分解脱氢反应动力学进行了理论分析，确定了反应级数，获得了动力学方程表达式，求出了相应的动力学参数及反应活化能。在此基础上，阐明了纳米晶氢化态镁及AZ31镁合金脱氢动力学差异的原因

Abstract:

The dehydriding processes and kinetics of nanocrystalline hydrided Mg and AZ31 Mg alloy powders at different temperatures have been studied. By theoretical analysis of the experimental data of the pyrolytic dehydriding reaction and fitting them with the Johnson-Mehl-Avrami (JMA) equation, the kinetic equation and the corresponding kinetic parameters including the reaction order, the reaction rate constant, and the reaction activation energy have been obtained. Furthermore, the reason why there is difference in dehydriding kinetics between the hydrided Mg and AZ31 Mg alloy powders has been interpreted referring to the thermodynamic and kinetic factors.