倾斜冷却剪切流变参数对半固态AlSi9Mg合金组织的影响  

Effects of parameters of incline cooling and shearing on microstructures of semi-solid AlSi9Mg alloy

作　　者：谭建波[1] 李志勇[1] 王英杰[1] 刘江成[2] 谷超[1] 张江超[1] 

机构地区：[1]河北科技大学材料科学与工程学院,石家庄050018 [2]中国南车集团石家庄车辆厂,石家庄050000

出　　处：《中国有色金属学报》2009年第4期607-612,共6页The Chinese Journal of Nonferrous Metals

基　　金：河北科技大学校科研基金项目(2007012)

摘　　要：利用自制的实验装置研究倾斜式冷却剪切流变技术制备半固态AlSi9Mg合金。结果表明:合金熔体在倾斜冷却板表面非均匀形核并受到重力和振动力的剪切作用,初生α(Al)逐渐从枝晶网络演化为细小的球状或粒状晶;控制浇注温度在600℃、倾斜板长度在600mm、振动频率在50Hz时可以获得组织良好的半固态合金熔体,合金熔体中初生α(Al)的平均晶粒尺寸为50μm,形状因子为0.71;机械振动能显著细化AlSi9Mg合金组织,随着振动频率的提高,初生α(Al)明显细化,圆整度也随之提高。An experimental set-up of inclined cooling and shearing was developed to prepare semi-solid AlSi9Mg alloy. The results show that the molten alloy is nucleated heterogeneously on the inclined-cooling plate surface and under shearing of the gravitation and vibration. Original α（A1） phase converts gradually from the cellular dendrite into tiny spherical or granular crystal. Under pouring temperature of 600 ℃, sloping plate length of 600 mm and vibration frequency of 50 Hz, the semisolid alloy melt with good microstructure can be obtained. In the alloy melt the average grain size of the original α（A1） phase is 50μm, and its shape factor is 0.71. Mechanical vibration can refine obviously the microstructure of AlSi9Mg alloy. With increasing vibration frequency, the original α（Al） phases are refined obviously, and their roundness is improved.

关 键 词：AlSi9Mg合金 半固态 冷却剪切 组织 

分 类 号：TG146.4[一般工业技术—材料科学与工程]