Abstract Scope |
Al-Ti-B system grain refiner which includes TiB2 particles is added into molten Aluminum due to achieve the fine grains. The mechanism of grain refinement has been proposed that the TiB2 particles work as the heterogeneous nuclei. However the effect of grain refinement greatly fluctuates with grain refiner manufacturers and the lots despite the same composition. Furthermore, although a various features for the grain refiner exist, it is unclear which feature is the most effective for grain refining. In this study, the effect of grain refinement was investigated by using several grain refiners with different manufacturers and different compositions. TiB2 particle size distribution in grain refiner was measured by image analysis and applied to the grain size prediction model which is developed based on the free growth model. The experimental results and predicted values were compared and discussed. |