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 with respect to other alloys:
- Its 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 it is easier to handle.
- Longer duration of the die than one for aluminium (three or four times longer), lower replacement and maintenance costs off the dies.
- The highest machining speed of all metals: higher production when secondary operations are required.
- Higher vibration absorption. Ideal for those uses in which this property is required. Less noise when handling 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 sports equipment applications etc.
Main characteristics of commercial alloy MAGNESIUM AZ91D
Magnesium Chemical Composition
In accordance with standard: 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||Less than zamak|
|Expansion coefficient||x 10-6 K-1||26|
|Specific heat||J/kg x K||1050|
|Thermal 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