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Non-ferrous Metals:

Cast Aluminium

Cast aluminiumAluminium is very well available in the form of bauxite. The reason for its high price is the large amount of electric energy, necessary for the extraction process: 148 MJ/kg Al. Recycling of used material (secondary Al) takes considerably less energy: 10 MJ/kg Al. Therefore recycling is favourable, although some alloying elements cause problems. Cast Al alloys represent about 15% of Al applications. Compared to steel, both density and Young's modulus of Al are a factor 3 lower. Strength is comparable to plain carbon steels. Corrosion resistance is good, especially for pure Al and Al-Mg alloys, as a result of a closed protective oxide layer. Castability (and weldability) of Al are good, due to the low melting temperatures caused by the alloying elements. Cast alloys generally contain a higher percentage of alloying elements compared to wrought alloys. Manufacturing of Al by machining is difficult because of the high plasticity.


Idemat 2003