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Zinc-aluminum alloys, more commonly referred to as ZA, are named as such because the main constituents are zinc and aluminum. Other alloying elements include magnesium and copper. This type of alloy was originally developed for gravity casting. Noranda, New Jersey Zinc Co. Ltd., St. Joe Mineral Co. and ILZRO were the main companies that pioneered the ZA alloys between the 1950s and the 1970s. They were designed to compete with bronze, cast iron and aluminum using sand and permanent mold casting methods. Distinguishing features of ZA alloys include high as-cast strength, excellent bearing properties, as well as low energy (melting) requirements.
Additional recommended knowledge
The numbers associated with the name represent the amount of aluminum in the alloy (i.e. ZA8 has 8% aluminum). 
|This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Zinc_aluminum". A list of authors is available in Wikipedia.|