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Standard yellow gold alloys which are based on gold-silver copper can be used for many production processes. They could be called ‘all-purpose’ alloys. However, optimising the alloys for the particular manufacturing process to be employed is possible by use of other alloying additions which can influence relevant properties such as castability and grain size as well as the mechanical ones, for example, strength, hardness and ductility. Only a few elements (e.g. zinc, silicon, iridium, cobalt) have proved to be useful additions for modifying carat gold alloys without detrimentally changing other relevant properties.... (2002) Complete Story
