半固态A356铝合金浆料的行波搅拌制备工艺  

Preparation of Semi-solid A356 Alloy Slurry with Traveling Wave Stirring

作　　者：钟荣茂[1] 毛卫民[1] 赵振铎[1] 

机构地区：[1]北京科技大学材料科学与工程学院

出　　处：《特种铸造及有色合金》2008年第5期359-362,共4页Special Casting & Nonferrous Alloys

基　　金：国家高技术研究发展计划(863计划)资助项目(2006AA03Z115);国家重点基础研究发展计划(973计划)资助项目(2006CB605203)

摘　　要：采用行波电磁搅拌和低过热度浇注复合制备工艺,成功制备出初生α-Al为球状的较大尺寸A356铝合金半固态浆料。研究了浇注温度、搅拌频率和搅拌功率对A356铝合金半固态浆料组织的影响。结果表明,随着浇注温度的降低,半固态A356铝合金组织中的初生α-Al更圆整。当搅拌频率达到或高于10Hz时,半固态A356铝合金浆料中的组织比较理想。当电磁搅拌功率增大时,半固态A356铝合金熔体中的蔷薇状初生α-Al受到更剧烈的附加温度起伏而使枝晶根部熔断,形成更多更圆整的球状初生相。因此,在630℃浇注、搅拌频率为10Hz和搅拌功率为1.72kW下,能制备出更圆整、细小的初生α-Al。The bigger size A356 aluminum alloy semi-solid slurry with spherical primary α-Al phase was prepared by low super-heating pouring combining with traveling wave electromagnetic stirring. The effects of pouring temperature,stirring frequency and stirring power on the microstructure of semi-solid A356 aluminum alloy slurry were observed. It is found that with decreasing in pouring temperature,the primary α-Al phase in the semi-solid slurry becomes more and more round,and the more desirable microstructure in the semi-solid slurry can be prepared with the stirring frequency equal to or more than 10 Hz. With increasing in stirring power,the more round primary α-Al phase can be formed in the semi-solid slurry,which is attributed to the rosette-like primary α-Al phase in the semi-solid A356 alloy slurry intensely subjected to the man-made temperature fluctuation to result in the root melting of dendrite. The fine spheroidized primary α-Al phase can be successfully prepared with pouring at 620 ℃ and stirring at 10 Hz as well as 1.72 kW.

关 键 词：半固态 A356铝合金 行波电磁搅拌 低温浇注 显微组织 

分 类 号：TG27[金属学及工艺—铸造]