Abstract
In the present experimental study, bimetal aluminium/magnesium macro composites which contain magnesium core were fabricated via compound casting by lost foam casting process. AM50 Mg alloy prismatic core was placed into a cubic EPS foam pattern. Conventional process steps of lost foam casting were followed and A319 casting aluminium alloy was melted and poured. Experimental studies have shown that determination of casting temperature is very important to avoid melting of Mg alloy core. Microstructures of sectioned cast specimens were observed by light microscope and scanning electron microscope (SEM). Energy dispersive X-ray spectroscopy (EDS) analysis and Brinell hardness tests were carried out. Especially, transition zone and Al/Mg interface were in the focus of research.
Kurzfassung
In der diesem Beitrag zugrunde liegenden experimentellen Studie wurden bimetallische Aluminium-Magnesium-Makrokomposite mit Magnesiumkern mittels des Lost-Foam-Gießens hergestellt. Hierzu wurde ein prismatischer Kern aus einer AM50-Mg-Legierung in einer kubischen EPS-Schaumform plaziert. Nach den konventionellen Prozessschritten des Lost-Foam-Gießens folgend, wurde eine A319-Gusslegierung geschmolzen und vergossen. Experimentelle Studien haben gezeigt, dass die Bestimmung der Gusstemperatur sehr wichtig ist, um ein Schmelzen des Magnesiumkerns zu vermeiden. Die Mikrostrukturen der geschnittenen Gussproben wurden mittels Lichtmikroskopie und Rasterelektronenmikroskopie (REM) untersucht. Außerdem wurden Energiedispersive Röntgenspektroskopie (EDS) und Brinellhärtemessungen durchgeführt. Im Fokus der Untersuchungen standen insbesondere die Übergangszone und die Al/Mg-Phasengrenze.
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