Influence of serpentine channel pouring process parameters on semi-solid A356 aluminum alloy slurry  

蛇形通道浇注工艺参数对半固态A356铝合金浆料的影响(英文)

作　　者：陈正周[1] 毛卫民[1] 吴宗闯[1] 

机构地区：[1]北京科技大学材料科学与工程学院,北京100083

出　　处：《Transactions of Nonferrous Metals Society of China》2011年第5期985-990,共6页中国有色金属学报（英文版）

基　　金：Project (2006AA03Z115) supported by the National High-tech Research and Development Program of China;Project (2006CB605203) supported by the National Basic Research Program of China;Project (50774007) supported by the National Natural Science Foundation of China

摘　　要：Semi-solid A356 aluminum alloy slurry was prepared by using serpentine channel pouring process, and the influences of the channel diameters and pouring temperatures on the semi-solid A356 aluminum alloy slurry were investigated. The experimental results show that when the channel diameter is 20 and 25 mm, respectively, and the pouring temperature is 640-680 ℃, the average diameter of primary α（Al） grains in the prepared A356 aluminum alloy slurry is 50-75 and 55-78 μm, respectively, and the average shape factor of primary α（Al） grains is 0.89-0.76 and 0.86-0.72, respectively. With the decline in the pouring temperature, the microstructure of semi-solid A356 aluminum alloy slurry is more desirable and a serpentine channel with smaller diameter is also advantageous to the microstructure imProvement. During the preparation of semi-solid A356 aluminum alloy slurry, a large number of nuclei can be produced by the chilling effect of the serpentine channel, and owing to the combined effect of the chilled nuclei separation and melt self-stirring, primary α（Al） nuclei can be multiplied and spheroidized finally.采用蛇形通道浇注技术制备半固态A356铝合金浆料,并研究浇注温度和通道直径对半固态A356铝合金浆料的影响。结果表明:当通道直径为20和25mm、浇注温度为640-680℃时,可以制备出初生相α(Al)的半固态浆料,其平均形状因子分别为0.89-0.76和0.86-0.72、平均晶粒直径分别为50-75μm和55-78μm。随着浇注温度的降低,半固态A356铝合金浆料中初生α(Al)晶粒的组织变得细小;较小的通道直径有利于组织的改善。在制备半固态A356铝合金浆料过程中,通道内壁的激冷能够产生大量的晶核。由于晶粒游离和合金熔体自搅拌的共同作用,初生α(Al)晶核能够在熔体内部增殖并且球化。

关 键 词：SEMI-SOLID A356 aluminum alloy serpentine channel primary α（Al） 

分 类 号：TG292[金属学及工艺—铸造]