(Žilinská univerzita v Žiline, 2023) Medňanský, Martin; Brůna, Marek; Matejka, Marek
A number of technological parameters influence the mechanical properties of a high pressure die casting.
The aim of the presented paper was to perform microstructural analysis of AlSi9Cu3(Fe) alloy casting fabricated
with high-pressure die casting (HPDC) technology. Several castings with varying casting parameter – maximum
plunger speed vmax were cast. In pre-selected critical spots, the effect of vmax was observed on the shape and size
of the structural components, where at lower vmax the eutectic Si shortened in length and thickened. 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 being present in both modifications – oblong grains and globular ternary eutectic.
There was no significant change in microhardness of α(Al) phase found, that would be caused by the varying vmax
