6061铝合金半固态浆料的行波电磁搅拌制备工艺  

Fabrication of 6061 Alloy Semi-Solid Slurry Under Traveling-Wave Electromagnetic Stirring

作　　者：高小勇[1] 毛卫民[1] 张云涛[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：《铸造》2010年第4期347-350,共4页Foundry

基　　金：国家高新技术研究发展规划项目(2006AA03Z115);国家重点基础研究规划项目(2006CB605203);国家自然科学基金项目(50374012)

摘　　要：采用低过热度浇注和弱行波电磁搅拌工艺,成功制备出6061铝合金半固态浆料。研究了浇注温度、搅拌功率和搅拌时间对6061铝合金半固态浆料的影响。结果表明:低过热度浇注和弱行波电磁搅拌技术可获得具有良好球状初生α-Al的6061合金半固态组织。浇注温度接近液相线温度,搅拌功率大于2.5kW,搅拌时间大于10s时,6061铝合金半固态浆料中的初生α-Al细小圆整,尺寸均匀。但是当浇注温度降至液相线温度时,组织中出现少量树枝晶。最佳工艺参数:浇注温度667℃、搅拌功率2.5kW、搅拌时间10s。The semi-solid slurry of 6061 alloy has been fabricated under weak traveling-wave electromagnetic stirring by low superheat pouring. The effects of pouring temperature, stirring power and stirring time on the morphology of the primary α-Al phase were studied. Results show that an ideal microstructure of the semi-solid 6061 alloy slurry can be obtained while the pouring temperature is near to the liquidus, the stirring power over 2.5 kW and the stirring time over 10 s. When the pouring temperature is decreased to the liquidus, a few large dendritic α-Al grains exist in the microstructure. The optimized processing parameters have been obtained as follows： the pouring temperature is 630 ℃, the stirring power is 2.5 kW and the stirring time is 10 s.

关 键 词：半固态 6061铝合金 行波电磁搅拌 初生Α-AL 浇注温度 

分 类 号：TG249.9[金属学及工艺—铸造]