扩渗时间对纯镁表面扩渗合金层形成行为的影响

Effect of diffusion time on the formation behavior of alloying layer for pure magnesium

研究了扩渗温度为390℃条件下，扩散时间对纯镁扩渗合金层的显微特征影响。结果表明：随着扩渗时间从4h-8h-12h，表面合金层逐渐由Al6Mg10Zn发展为Al5Mg11Zn4，随着扩渗时间的延长，Al5Mg11Zn4较Al6Mg10Zn更为稳定；依据所发现的反应层组成和结构特征，提出了Zn作为主控元素的概念。

The effect of diffusion time on the microstructure of alloyed layer for pure magnesium was studied, while the diffusion temperature was 390℃. The result showed that the surface alloyed layer changed from Al6Mg10Zn to Al5Mg11Zn4 gradually as the reaction time increased from 4h to 8h, and then to 12h. That means Al6Mg10Zn was more stable than Al5Mg11Zn4 when the diffusion time extended. According to the compositions and structure characteristics of the reaction layer we discovered, we put forward a conception of making Zn as a control element.