Abstract
The Al-Si cast alloy mechanical properties and microstructure depends on the chemical composition; melt treatment conditions, solidification rate, casting process and the applied thermal treatment. Modification can be achieved by several methods as faster solidification, mould vibration, and melt inoculation by using chosen elements like Sr, Na, Sb, etc. Present work is focused on study of the effect of Sb-modification (with AlSb10 from 0 up to 300 ppm) on the structure and mechanical properties in AlSi7Mg0.3 cast alloy. AlSi7Mg0.3 alloy can be used for high temperature casting (e.g. engine, pistons) therefore is necessary to determine the properties at higher temperature. The mechanical properties were evaluated at room (21 °C) and 260 °C. The results show that the modification of experimental material is important. Experimental alloy has by optimal modification (50 ppm Sb) UTS at 260 °C above 100 MPa.
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