Magnesium is the most lightweight structural metal that can be employed in industry. Its casting alloys are increasingly used for those functions when light weight is an issue. It can also be an economic alternative to zamak or aluminium, depending on the characteristics of the parts. Compared to polymers, magnesium has all the advantages of metals and its density is only slightly higher.
Main advantages respect to other alloys:
- Density is 33% lower than aluminium alloys, and 73% lower than zamak: Very lightweight parts, for those uses in which this property is required, and also lower transport costs and easier to manipulate.
- Longer duration of the die than with aluminium (three or tour times longer), lower replacement and maintenance costs for the dies.
- The highest mechanising speed from all metals: more production when secondary operations are required.
- Higher vibration absorption. Ideal for those uses in which this property is required. Less noise when manipulating parts.
- Compatibility and costless interchangeability with zamak dies, since both use the same hot chamber technology.
- … and a marketing appeal, for its “novelty” status, ideal for sport equipment applications etc.
Main characteristics of commercial alloy MAGNESIUM AZ91D
Magnesium Chemical Composition
In accordande to the norm: DIN 1729 3.5912
|Aluminium||Al||8,3 - 9,7|
|Zinc||Zn||0,35 - 1|
|Density at 20ºC||g/cm³||1,81|
|Fusion Interval||ºC||470 - 595|
|Casting Temperature||ºC||625 - 700|
|Contraction at solidification||mm/m||Menos que el zamak|
|Expansion coefficient||x 10-6 K-1||26|
|Specific heat||J/kg x K||1050|
|Termal conductivity||W/m x K<||72|
|Electrical conductivity||% IACS||12,2|
|Brinell hardness||63 - 70|
*These properties given are for information purposes only and differ depending on the sape of the part and casting parameters.
Comparison of alloy properties