This paper deals with influence on segregation of iron based phases on the secondary alloy AlSi7Mg0.3 microstructure by chrome. Iron is
the most common and harmful impurity in aluminum casting alloys and has long been associated with an increase of casting defects. In
generally, iron is associated with the formation of Fe-rich phases. It is impossible to remove iron from melt by standard operations, but it is
possible to eliminate its negative influence by addition some other elements that affect the segregation of intermetallics in less harmful
type. Realization of experiments and results of analysis show new view on solubility of iron based phases during melt preparation with
higher iron content and influence of chrome as iron corrector of iron based phases. By experimental work were used three different
amounts of AlCr20 master alloy a three different temperature of chill mold. Our experimental work confirmed that chrome can be used as
an iron corrector in Al-Si alloy, due to the change of intermetallic phases and shortening their length.
This article deals with the fatigue properties of newly used AlZn10Si8Mg aluminium alloy where the main aim was to determine the
fatigue strength and compare it with the fatigue strength of AlSi7Mg0.3 secondary aluminium alloys which is used in the automotive
industry for cyclically loaded components. AlZn10Si8Mg aluminium alloy, also called UNIFONT 90, is self-hardening (without heat
treatments), which contributes to economic efficiency. This is one of the main reasons why is compared, and may be an alternative
replacement for AlSi7Mg0.3 alloy which is heat treated to achieve required mechanical properties. The experiment results show that the
fatigue properties of AlZn10Si8Mg alloy are comparable, if not better, than AlSi7Mg0.3 alloy. Fatigue properties of AlZn10Si8Mg alloy
are achieved after seven days of natural ageing, immediately after casting and achieving value of fatigue strength is caused by structural
components formed during solidification of the melt.