【摘要】 采用双级雾化装置制备了四种铝合金粉末，分析了粉末的粒度组成、颗粒形貌和微观组织．计算了粉末的冷却速度．双级雾化粉末的平均粒度比单级气体雾化粉末细两倍，平均冷却速度高一个数量级；Ａｌ－Ｓｉ二元合金中，细小颗粒的微现组织主要由不同Ｓｉ含量的块状过饱和固溶体组成．更多还原

【Abstract】 In this paper,four aluminium alloy powders were prepared in a two-stage atomization equipment.The particle sizes, morphology and microstructure were examined.The cooling rate of powder was also determined.The average size of particles by two-stage atomization is double finer than that by gas atomization,and the average cooling rate is ten times as high as that by gas atomization.The microstructure of particle in Al-Si alloy mainly consists of block supersaturation solid solutions with different contents of silicon.更多还原