Al-Mn Intermetallics in High Pressure Die Cast AZ91 and Direct Chill Cast AZ80

Manganese-bearing intermetallic compounds (IMCs) are important for ensuring adequate corrosion performance of magnesium-aluminium alloys and can be deleterious to mechanical if they large and/or form clusters. Here, we explore the formation Al-Mn IMCs in Mg-9Al-0.7Zn-0.2Mn produced by two industrial casting processes, high-pressure die (HPDC) direct chill (DC) casting. As Al8Mn5 starts forming above α-Mg liquidus temperature this alloy, consider its during melt handling as well heat treatment. In HPDC, focus on sludge holding pot, partial solidification shot chamber, IMC cavity. DC casting, interactions between oxide films launder system, billet, transformation into Al11Mn4 solution The results show that minimising pre-solidification sleeve HPDC controlling pouring filtration small particles these processes.