This paper is a study about the aluminium series 7075. 7075 aluminium alloy's composition roughly includes 5.6–6.1% zinc, 2.1–2.5% magnesium, 1.2–1.6% copper, and less than a half percentage of silicon, iron, manganese, titanium, chromium, and other metals. By this study we trying to improve the properties of AL7075 to the properties of 5 series. We can apply this to Marian and Aerospace applications because of the improved mechanical properties. By the addition of silicon nitride in different compositions (2%, 4%, 6%) to the Al7075 and we cast it and testing it. This theme developed from the studies of deferent AL material and its behaviour. We can see that the addition of a different compound to the AL helps to improve its properties and the improved materials use in different modes.

Keywords : al7075,Silicon Nirtride, Ansys, Stir Casting.