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通过研究温度、氢压和时间等对ZK60镁合金粉体氢化-脱氢过程的影响,开发了制备ZK60纳米晶镁合金粉体材料的新工艺。在探究ZK60合金粉体完全氢化-脱氢的基础上,采用XRD、OM、SEM以及TEM考察了氢化-脱氢前后镁合金粉体组织与结构演变。实验结果表明,ZK60合金粉体在氢化-歧化-脱氢-再复合(hydrogenation–disproportionation–desorption–recombination,HDDR)过程中,温度对其氢化-脱氢程度影响最大。可完全氢化的最佳技术为350℃时,2 MPa氢压下保温12 h,完全脱氢的最佳工艺是在350℃下抽高真空3 h。采用该工艺可将ZK60合金粉末的晶粒由160?m细化到20 nm左右。
By studying the influence of temperature, hydrogen pressure and time on the hydrogenation-dehydrogenation process of ZK60 magnesium alloy powder, a new process for preparing ZK60 nanocrystalline magnesium alloy powder material has been developed. On the basis of exploring the complete hydrogenation and dehydrogenation of ZK60 alloy powders, the microstructure and structure evolution of magnesium alloy powders before and after hydrogenation-dehydrogenation were investigated by XRD, OM, SEM and TEM. The experimental results show that the temperature has the greatest effect on the degree of hydrogenation and dehydrogenation of ZK60 alloy powders in hydrogenation-disproportionation-desorption-recombination (HDDR) process. The best technology for complete hydrogenation is 350 ℃, 12 MPa hydrogen pressure for 12 h, the best process for complete dehydrogenation is to pump high vacuum at 350 ℃ for 3 h. The process can be ZK60 alloy powder grain refinement from 160? M to about 20 nm.