Abstract
The amorphous 18K white gold alloy of the composition Au49Ag5.5Pd2.3Cu26.9Si16.3 at% possesses a premium white-gold color and a Vickers hardness value 1.5 times that of conventional white gold alloys. These properties, together with the low melting temperature of ca. 370°C and its good processability are highly desired for jewelry applications. Nevertheless, the premium white color of this alloy is unstable and turns into a yellowish brown color after some time. The intense tarnishing of the Au49Ag5.5Pd2.3Cu26.9Si16.3 at% bulk metallic glass alloy under various different environmental conditions has been investigated by SEM, STEM, TEM, and Auger spectroscopy (AES) and linked to a chemical interaction between the copper and the silicon of the alloy. A mechanism behind the tarnishing is discussed in detail and suggestions are made for future alloy development towards a tarnish resistant 18K amorphous white gold alloy.
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