Effects of the addition of Sr modifier and Al-5Ti-1B grain refiner and the combined addition on the microstructure of hypoeutectic Al-Si alloys

Different grain refiners and modifiers have been used to improve the microstructure and mechanical properties of hypoeutectic Al-Si alloys. In this study the effect of Al-5Ti-1B grain refiner on the α-Al Phase has been discussed in this paper, which showed decrease in the size of α-Al grains; and the impact of Sr has been observed as the silicon modifier. Besides this the effect combine addition of Al-5Ti-1B grain refiner and Sr on the microstructure has been discussed in this paper. It has been observed that by increasing the level of grain refiner addition, a negative interaction took place between Al-5Ti-1B and Sr that had a negative impact on the microstructure.

Keywords:

Hypoeutectic Al–Si foundry alloys , Eutectic modification , Grain refinement