Effect of closed-couple gas atomization pressure on the performances of Al-20Sn-1Cu powders

作     者：ZHAO Xinming XU Jun ZHU Xuexin ZHANG Shaoming ZHAO Xinming, XU Jun, ZHU Xuexin, and ZHANG Shaoming National Engineering and Technological Research Center for Non-ferrous Metals Composites, General Research Institute for Non-ferrous Metals, Beijing 100088, China

作者机构：National Engineering and Technological Research Center for Non-ferrous Metals Composites General Research Institute for Nonzferrous Metals Beijing 100088 China 

出 版 物：《Rare Metals》 (稀有金属（英文版）)

年 卷 期：2008年第27卷第4期

页      面：439-443页

核心收录：

学科分类：08[工学] 080502[工学-材料学] 0805[工学-材料科学与工程（可授工学、理学学位）] 

基　　金：the Major State Ba-sic Research Development Program of China (Nos. 2006CB605203 and 2006CB605204) 

主　　题：powder production Al-Sn-Cu alloy gas atomization rapid solidification particle size distribution 

摘      要：Al-20Sn-1Cu powders were prepared by gas atomization in an argon atmosphere with atomizing pressures of 1.1 and 1.6 MPa. The characteristics of the powders are determined by means of dry sieving, scanning electron microscopy （SEM）, optical microscopy （OM）, and X-ray diffractometry （XRD）. The results show that the powders exhibit a bimodal size distribution and a higher gas pressure results in a broad size distribution. All particles in both cases are spherical or nearly spherical and satellites form on the surface of coarse particles. Dendritic and cellular structures coexist in the particle. With decreasing particle diameter, the secondary dendrite arm spacing （SDAS） decreases and the cooling rate increases. The particles processed under high gas atomization pressure （1.6 MPa） exhibit a lower SDAS value and a higher cooling rate than those of the same size under low gas atomization pressure （1.1 MPa）. The XRD results show that the Sn content increases with decreasing particle size.