The influence of modification for structure and impact resistance of silumin AlSi11

In this paper t he results of the modification process of alloy AlSi11 as well as the influence of modification for structure and i m- pact resistance have been presented. The investigation revealed that the modification of the AlSi11 silumin with the addition 0,05 - 0,4% Al Sr10 and 0,1 - 0,2% AlB4 simultaneously provided the advantageous refinement of the α - phase as well as the change of the morphology of the eutectic silicon from the lamellar into the fibrous one. The change resulted in a relevant increase in the impact res istance of the alloy and the widening of the plastic area of the fracture of the silumin samples.