Al-Mg-legering
Ydeevneegenskaberne for Al-Mg aluminiumslegering er: gode mekaniske egenskaber ved stuetemperatur; stærk korrosionsbestandighed; dårlige støbeegenskaber, store udsving i mekaniske egenskaber og vægtykkelseseffekter; langvarig-brug, legeringens plasticitet på grund af ældningsfald, og endda revnedannelse forekommer i trykstøbegods; tendensen til spændingskorrosion i trykstøbegods er også større. Ulemperne ved Al-Mg-legering opvejede delvist dens fordele, hvilket gør den begrænset i anvendelse.
Al-Zn-legering
Al-aluminiumslegeringsstøbegods kan opnå højere mekaniske egenskaber efter naturlig ældning. Når massefraktionen af zink er større end 10 procent, er styrken væsentligt forbedret. Ulempen ved denne legering er dårlig korrosionsbestandighed, tendens til spændingskorrosion og let varm revnedannelse under trykstøbning. Den almindeligt anvendte Y401-legering har god flydeevne og er nem at fylde hulrummet. Ulempen er, at den har stor tendens til at danne porer, og når indholdet af silicium og jern er lavt, er det let at blive varmrevnet.
Al-Si-legering
Because Al-Si aluminum alloy has the characteristics of small crystallization temperature interval, large solidification latent heat of silicon phase in the alloy, large specific heat capacity, and relatively small linear shrinkage coefficient, its casting performance is generally better than other aluminum alloys. Its filling ability is also good, and the tendency of thermal cracking and shrinkage is relatively small. The Al-Si eutectic contains the least amount of brittle phase (silicon phase), and its mass fraction is only about 10 percent , so its plasticity is better than that of other aluminum alloy eutectic, and the remaining brittle phase can be further treated by modification. Improve plasticity. The test also shows that the Al-Si eutectic still maintains good plasticity at the temperature near its freezing point, which is not found in other aluminum alloys. There is often a considerable amount of eutectic in the cast alloy structure to ensure its good casting performance; the increase in the number of eutectic will make the alloy brittle and reduce the mechanical properties, there is a certain contradiction between the two. However, due to the good plasticity of Al-Si eutectic, it can better take into account the requirements of both mechanical properties and casting properties, so Al-Si alloy is currently the most widely used die-casting aluminum alloy.
