Spangold
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Spangold is family of shape memory-effect alloys (SME) of gold, copper, and aluminum in either 18K or 23K which, when heated and cooled correctly, results in a multi-colored faceted finish which is appealing as jewelry. The name of the family is a play on the word "spangled".[1]
Spangold is a with a nominal stoichiometry of Au7Cu5Al4 and a nominal composition by mass of 76% gold, 18% copper, and 6% aluminum. The texture is caused by the induction of a martensitic-type phase transformation on a polished surface.[2][3]
References[]
- ^ Ira Wolff; Michael Cortie (1994). "The Development of Spangold". Gold Bulletin. 27 (2): 44–54.
- ^ "Spangold Alloys". Total Materia. July 2013.
- ^ "Spangold : a now aura for Intermetallica". Metal Abstracts. 27: 15. June 1994.
Categories:
- Precious metal alloys