【摘要】 采用机械合金化制备出Mg-50%Mm(NiCoMnAl)5(质量分数,下同)复合材料,对其吸氢过程热力学、动力学研究发现:该复合材料退火后不需要活化,在250℃、0.16MPa时的吸氢量为3.53%,α-β相区退火前后的反应速度分别为3.13%/min,5.83%/min,具备良好的动力学性能。采用XRD衍射测试和分析机械合金化后产物的物相结构,实验证明:物相组成为Mm2Mg17和Mm(NiCoMnAl)5,混合粉末经过机械合金化后,晶粒细化,增加了固态扩散能力,有利于固相反应的进行,从而改善材料的氢化性能。更多还原

【Abstract】 Mg 50 wt%Mm(NiCoMnAl)5 alloy was prepared by mechanical alloying (MA). It’s thermodynamic and kinetic properties were investigated. The composite possesses good kinetic properties and a high hydrogen storage capacity of 3.53 wt%without any activation at 523 K and 0.16 MPa. It has an average absorption rate of 3.13 wt%/min before annealing and 5.83 wt%/min after annealing in the α βphase. X ray diffraction was used to characterize the composite after mechanical alloying. It is found that the particles of mixed powder of Mm2Mg17 and Mm(NiCoMnAl)5 are greatly reduced by MA, and the refining of microstructure enhances the solid diffusion. The results indicate that the hydriding property of the material is well improved.更多还原