Recently, high pressure die casting is widely employed in many
fields (such as aerospace and automotive) for the superb productivity
and flexibility. HPDC enables mass production of large, thin
wall and complex aluminum components economically [1,2].
According to ASTM standard B85/B85M, Al–Si–Cu and Al–Si
(ADC12 and A380) alloys are the most commonly used alloy in
die casting industry because of their excellent die filling capacity
and anti-soldering to the die. However, their relatively poor ductility
(d 6 3.5%) and toughness fail to meet the rigorous requirements
of component subjected to cyclic stress, because the existence of
Cu and Fe deteriorates the integrity and fatigue strength of the
base alloys proposed by Ceschini et al. [3,4], respectively. Die casting
Al–Mg alloy is preferentially applied to produce the automotive
security parts but the severe oxidation of magnesium and poor
formability limited its application