Production of Al-Ti-C Grain Refiners with the Addition of Elemental Carbon and K_2TiF_6

摘要

Al-Ti-B grain refiners are widely used as aluminum grain refiners. Despite the problems in application, Al-Ti-C refiners have an increasing demand in recent years. In the present work, Al-Ti-C grain refiners with different Ti:C ratios were produced by in-situ method with the addition of elemental carbon into the Al-Ti master alloy (master alloy method) and the addition of K_2TiF_6 and elemental carbon powder mixture into the commercially pure aluminum (flux method). The effects of production method and Ti:C ratio on the grain refinement process were investigated using Alcoa Cold finger Test and so optimum conditions were determined. The best performance was accomplished with the refiner produced at 1300°C with the master alloy method.