Magnesium
Egenskaper:
- Low heat content, which is both an advantage and a disadvantage. It is an advantage when a high production rate can be maintained, but a disadvantage when the molten material has to be injected extremely quickly into the mould so that it does not solidify.
- Lower rate of wear on tools during die-casting.
- Generally lower durability compared to aluminium.
- Less good corrosion resistance compared to aluminium.
- Magnesium is easily ignited and therefore has to be handled carefully. In particular, it is oxidisation in its liquid form that represents an ignition risk.
Areas of use
Generally magnesium has a lower durability than, for example, aluminium and so is perhaps not the first choice if products that demand high durability are required. However, the difference in densities is as much as 1.8 to 2.7 g/cm3, and this means that even with a greater wall thickness, it is possible to achieve a reduction in weight in the component. Then the full effect of the density difference is obtained. Magnesium makes possible very-thin-walled designs and is readily machined. New magnesium alloys are under development and these include one that can be used in the engine block of a car.
Mechanical properties
Comparison of mechanical properties between die-casting, chill casting and sand casting
Standardisation
SS-EN 1753 – Magnesium and magnesium cast alloys – Die-castings – Chemical composition and mechanical properties.
Translation table for the various international standards:
Alloys that ADC uses for casting
