ZK60镁合金在氢化脱氢过程中的组织演化及纳米晶镁合金材料的制备

Microstructure evolution of ZK60 magnesium alloy during hydrogenation -dehydrogenation processing and preparation nanocrystalline magnesium alloy

摘要:

本文通过研究温度、氢压和时间等对ZK60合金氢化-脱氢过程的影响,开发了制备ZK60纳米晶材料的新工艺。在探究ZK60合金完全氢化-脱氢技术的基础上,采用XRD、OM、SEM以及TEM技术考察了氢化-脱氢前后镁合金组织与结构演变。实验结果表明HDDR过程中温度对其氢化-脱氢程度影响最大。在本文中可完全氢化的最佳技术参数为在350℃时,2MPa氢压下保温12h,并抽真空在350℃下保温3h完全脱氢,采用该工艺可将ZK60合金粉末的晶粒由160mm细化到20nm左右。

Abstract:

The present paper describes a new technology to manufacture nanocrystalline materials of ZK60 alloys via studying the influence of hydride temperature, hydrogen pressure and reaction time of the HDDR process on the course of hydrogen-desorption, By the means of XRD, OM, SEM and TEM technique, the microstructural evolution of magnesium alloy was researched. Experimental results show that the temperature plays an important role in the hydrogen-desorption process of ZK60 alloy. In the optimal HD process for preparing nanocrystalline Mg alloy powders is that the alloy is hydrogenated at temperature of 350℃ under 2MPa hydrogen pressure for 12 hours and then dehydrogenated at 350℃ for 3 hours in vacuum. As a result, the grain sizes of ZK60 alloy were refined to about 20nm from 160mm.