Investigation of As-cast Microstructures and Properties of 6063 Aluminium Alloys Melted with Grain-refining Aluminium Ingots

Grain-refining aluminium ingots are produced by electrolysis,through adding TiO2 into electrolyzing cell.This paper has researched as-cast microstructures and properties of 6063 Aluminium alloys melted with grain-refining aluminium ingots,contrasting with other grain-refining methods,such as with AlTi5,AlTi5B1 master alloys.The results shows: the AlTi5B1 master alloys have best grain refining effects,the AlTi5 master alloys have worse grain refining effects,grain-refining aluminium ingots is in the middle.The hardness of 6063 Aluminium alloys is depended on the contents of Mg2Si,regardless of grain diameters,when the contents of titanium are lower than 0.05%.