紧耦合雾化制备Al86Ni6Y4.5Co2La1.5非晶粉末及其表征分析

Preparation of Al86Ni6Y4.5Co2La1.5 amorphous powder by close-coupled gas atomization and its characterization analysis

摘要:

利用扫描电子显微镜、X射线衍射仪、X射线光电子能谱分析仪、粒度分析仪、差示扫描热量仪和显微硬度仪对采用紧耦合雾化方法制备的Al₈₆Ni₆Y_4.5Co₂La_1.5非晶合金粉末的微观结构、表面元素、粒径分布、热稳定性以及显微硬度进行了分析。结果表明,大部分粉末的粒径小于45μm(约为80%),主要由非晶相和纳米晶化相组成,其晶化演变过程为非晶→非晶′+fcc-Al→fcc-Al+AlNiY+Al₂Y；粉末表面存在厚度约为180.81 nm的Al₂O₃氧化层,硬度达300HV_0.1以上。

Abstract:

The morphology, microhardness, microstructure, thermal stability, particle size distribution and phase composition of the gas atomized Al₈₆Ni₆Y_4.5Co₂La_1.5 amorphous alloy powder were investigated by scanning electron microscope(SEM), X-ray diffractometry, X-ray Photoelectron Spectroscopy(XPS), particle size analysis, differential scanning calorimetry (DSC), and hardness tester. The result showed that the most size of Al₈₆Ni₆Y_4.5Co₂La_1.5 amorphous alloy powder was smaller 45μm(about 80%), and the structure the powder was consisted of amorphous matrix and nano-crystallization phase. Its crystallization process was amorphous→amorphous′+fcc-Al→fcc-Al+AlNiY+Al₂Y. There existed layer of Al₂O₃ oxidation with width of 180.81nm. The hardness of the powder was beyond 300HV_0.1.