Microstructure evolution behavior of AlSi9Cu3 alloy during rheocasting  

作　　者：郭洪民 刘旭波 杨湘杰 章爱生 刘勇 

机构地区：[1]School of Materials Science and Engineering,N anchang University

出　　处：《中国有色金属学会会刊：英文版》2010年第S3期815-820,共6页Transactions of Nonferrous Metals Society of China

基　　金：Project(50804023) supported by National Natural Science Foundation of China;Project(205084) supported by Ministry of Education Focused on Scientific and Technological Research

摘　　要：The experimental and analytical approaches were taken to investigate the non-dendritic microstructure formation and evolution of AlSi9Cu3 alloy during rheocasting.The results show that the globular primary α(Al) particles free of entrapped eutectic form after rheocasting for 3 s,and could be morphologically stabilized during subsequent growth.The fine and globular particles underwent a coarsening process under quiescently continuous cooling in which the particle density decreases,the solid fraction increases,the average particle size increases with the increase of solidification time at a rate that closely followed the classical Ostwald ripening.The experimental and analytical approaches were taken to investigate the non-dendritic microstructure formation and evolution of AlSi9Cu3 alloy during rheocasting.The results show that the globular primary α(Al) particles free of entrapped eutectic form after rheocasting for 3 s,and could be morphologically stabilized during subsequent growth.The fine and globular particles underwent a coarsening process under quiescently continuous cooling in which the particle density decreases,the solid fraction increases,the average particle size increases with the increase of solidification time at a rate that closely followed the classical Ostwald ripening.

关 键 词：AlSi9Cu3 ALLOY microstructure evolution RHEOCASTING INTERFACE INSTABILITY growth COARSENING 

分 类 号：TG292[金属学及工艺—铸造]