氢气氛下机械球磨Mg及Mg合金粉末的反应动力学和组织演变

In this paper, preparation of nanocrystalline MgH2 powder by mechanical milling the Mg and Mg alloy (ZK60 and AZ31) powder in hydrogen has been put forward, hydrogenation kinetics curve of these three types of powder in this process is measured, and using energy band theory, the catalysis of alloying elements is studied. In the meantime, the microstructure evolution of Mg and H2 during milling process is studied with X-ray diffraction (XRD), transmission electron microscopy (TEM) and other analytical tools. The results show that, the hydrogen absorption process of Mg and Mg alloy powder under the mechanical force can be divided into three stages, and the corresponding microstructures are Mg (H), Mg (H)+MgH2 and MgH2. After a certain period of time, Mg and Mg alloy powder are fully hydrogenated by milling with the hydrogen pressure of 0.5MPa, and the nanocrystalline MgH2 powder materials have been successfully obtained with powder size of 1-3μm, grain size of about 10nm.