机械振动对倾斜冷却板法制备亚共晶铝合金半固态组织的影响  

Effect of Mechanical Vibration on Semisolid Microstructure of Hypoeutectic Al-Si Alloy Prepared by Sloping Plate Process

作　　者：武晓峰[1] 张广安[1] 周岐[1] 

机构地区：[1]辽宁工业大学材料与化学工程学院,辽宁锦州121001

出　　处：《铸造》2009年第10期1002-1004,1008,共4页Foundry

基　　金：辽宁省教育厅重点实验室资助项目(20060394)

摘　　要：采用自制的振动倾斜冷却板装置,研究了机械振动对A356铝合金半固态组织的影响。结果表明,与倾斜冷却板上不施加振动相比,施加振动获得的组织中初生α-Al相的非枝晶球状或粒状更多,更均匀、细小,且获得该组织的最佳浇注温度范围更宽。与逆向施加振动相比,顺向振动所获得的非枝晶组织中包含有较多的蔷薇状晶体,而且球状或粒状晶体较粗大,不均匀。振动形成大量游离等轴晶,以及振动对流所引起的晶粒运动导致晶粒在各个方向逆向均匀生长是A356铝合金半固态非枝晶组织形成的主要原因。By using self-made vibrating sloping plate setup, effect of mechanical vibration on semisolid microstructure of A356 alloy was studied. Results show that the non-dendritic spherical or nodular grains of primary α-Al of A356 alloy prepared by sloping plate process with vibration are smaller and distributed more homogeneously, and optimal pouring temperature range is wider than that of without vibration. There are many rosette-like grains in non-dendritic microstructure obtained by adding forward vibration and the spherical or nodular grains are coarse and not homogeneous compared with that of with conversed vibration. Lots of free equiaxial crystals are formed by vibration and the grains grow in all directions caused by grain movement from vibration convection, which are the main reason for the formation of semisolid non-dendritic microstructure of A356 alloy.

关 键 词：振动 倾斜板 半固态 亚共晶铝硅合金 组织 

分 类 号：TG249.9[金属学及工艺—铸造]