混合球磨对YAl_2颗粒形貌及表面改性的影响

摘要

采用扫描电镜、能谱分析、透射电镜等分析方法研究了球磨对YAl2及YAl2/Mg颗粒的组织形貌、YAl2颗粒在YAl2/Mg颗粒中的分散性及YAl2/Mg界面结合状况的影响.结果表明：YAl2颗粒经球磨20 h后,其平均粒径约为1.5μm,颗粒边缘尖角数量明显减少,呈圆滑的近球形.加入Mg颗粒进行混合球磨20 h后,YAl2颗粒在混合颗粒中呈弥散分布,且表面包裹一层单质Mg,YAl2/Mg的界面为直接结合型,未发现有界面反应.%A homogeneous distribution of ultrafine YAl2 particles in YAl2/Mg mixture was obtained by mix-milling method.The effect of milling on the microstructure of YAl2 particles and the dispersion of YAl2 particles in the mixture were investigated by scanning electron microscopy（SEM）,energy dispersive X-ray（EDAX） and transmission electron microscope（TEM） techniques.The results show that with increasing milling time,YAl2 particle size decreases,and the amount of particle sharp corners is significantly reduced.After 20 h of milling,YAl2 particles have a nearly spherical shape with an average size of approximately 1.5 μm.YAl2 particles are coated by elemental magnesium,and distribute uniformly in YAl2/Mg mixture through ball milling.