(University of Žilina, 2023) Medňanský, Martin; Brůna, Marek; Matejka, Marek
The aim of the presented paper was to carry out a review of the internal structure of alloys used for high pressure die casting (HPDC) and to experimentally perform a structural analysis of AlSi9Cu3(Fe) alloy. Several
castings with varying casting parameter – maximum plunger speed vmax were cast. In pre-selected critical locations,
a change in porosity was observed with the change of the speed, and the casting samples with vmax = 2 and
3 m∙s-1 showed the lowest porosity. The effect of vmax was also observed on the shape and size of the structural
components, where at higher vmax the eutectic Si grew in length and decreased in thickness. EDS analysis
determined found intermetallic phases to be α-Al(Fe,Mn,Cr)Si in the shape of a rhombic dodecahedron with sizes
as small as 2 µm and Al2Cu occurring in both modifications – oblong grains and globular ternary eutectic.
