(1.福州大学 机械工程系， 福州 350002；
2.福州大学 材料科学与工程学院， 福州 350002)
摘 要: 探讨了铝熔体高效净化、富铁杂质相变质和晶粒细化处理技术的效果及其相互关系。提出净化是铝熔体处理的关键，是细化和变质的基础；据此研究了高效铝熔体综合处理技术，其效果显著。对压力罐用铝材的除杂率和针孔降低率分别达82.0%和87.0%，铸态晶粒平均尺寸减小了18.6倍，杂质相也由较粗大长针(片)状变成弥散细小的圆球状或短棒状，从而使材料的力学性能，尤其是塑性得到了较大幅度的提高。
关键字: 铝熔体; 净化; 变质; 晶粒细化; 熔体综合处理
melt-treatment of aluminum and its effect
（1.Department of Mechanical Engineering，
Fuzhou University，Fuzhou 350002，China;
2.College of Materials Science and Engineering，
Fuzhou University， Fuzhou 350002，China）
Abstract:The effect of melt-treatment techniques such as high-efficient purification，modification of Fe-rich impurity-phase and grain refinement and some interrelations among these treating techniques of molten aluminum were investigated. It is firstly put forward that the purification is the fundament al and the key process，that is, the basis of modification and grain refinement processes. Based upon this viewpoint，a new synthetical technique of high-efficient melt-treatment of aluminum has been developed. The new technique makes the metallurgical quality of aluminum sheet used for pressure can be improved remarkably，that is，the rate of removing inclusions and the extent of lowering porosity amount to about 82.0% and 87.0% respectively，and as-cast mean grain diameter is about a fraction of 18.6 times as big as that of no melt-treatment material，an d the coarse and long needle/flake Fe-rich impurity phases are transformed into complex compounds of tiny， sphere/short stick form. For this reason，the mechanical properties, especially the plasticity of this material have been improved remarkably.
Key words: molten aluminum; purification; modification; grain refinement; synthetical melt-treatment
