Abstract
The comparison of the performance of AlTi5B1 and AlTi3C0.15 grain refiners in commercial-purity aluminum AA 1080 at contents up to 10 g.kg^-1 for AlTi5B1 and 16 g.kg^-1 for AlTi3C0.15 grain refiner has been studied in this work. Results have shown that AlTi5B1 grain refiner is much more effective in suppressing the growth of the columnar grains at the same titanium contents. AlTi5B1 grain refiner in comparison to AlTi3C0.15 grain refiner also shows smaller grain size at the same titanium contents except at the highest titanium contents. It was observed that the effectiveness of AlTi5B1 grain refiner decreases at the contents above 4 g.kg^-1. Similar behaviour was not found for AlTi3C0.15 grain refiner. The differences in the behaviour of both refiners at high refiner contents can be explained by the differences in the mechanism of the grain refinement.

Key words
casting; aluminum; grain refining

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