利用固液扩散偶研究Mg-40Al与Mg-20Ce的界面反应

本文主要研究了Mg-40Al与Mg-20Ce固液界面在475°C, 500°C和525°C下保温5min至30min的界面反应和扩散层的生长动力学。结果发现，在扩散层中由于Al元素和Ce元素反应生成Al₁₁Ce₃, Al₃Ce and Al₂Ce金属化合物。金属化合物的体积分数随着扩散温度的升高而增加。扩散层的生长满足抛物线生长规律，扩散层的扩散激活能为42±3.7kJ/mol。实验研究的固液扩散为理解合金熔炼过程中金属化合物的形成提供了理论基础。

Study of interfacial reaction between Mg-40Al and Mg-20Ce using liquid-solid diffusion couples

Interfacial reactions and growth kinetics between molten Mg-40Al and solid Mg-20Ce were investigated. Reaction temperatures were at 475°C, 500°C and 525°C, with reaction time ranging from 5min to 30min. Al₁₁Ce₃, Al₃Ce and Al₂Ce were formed via the reaction of Al and Ce in the diffusion reaction layers. The volume fraction of the intermetallic compounds in the diffusion layer increased with temperature. The growth kinetics of the diffusion reaction layers was well conformed to the parabolic law. The activation energy for the growth of the diffusion reaction layers was 42±3.7kJ/mol. Liquid-solid diffusion experiment can better understand the formation of compounds in the smelting process. Kinetics datum were provided for the formation of the compound during the smelting process.