Influence of thermo-mechanical history on the ordering kinetics in 18 carat Au alloys

The use of grain refiners, such as iridium, in 18 kt gold alloys is a common practice in jewelry industrial applications. The use of these elements leads, however, to an increase in the costs of raw materials and greater attention during the solidification phases and during the refining and recycling of alloys is required. This work aims to demonstrate that through the optimization of thermo-mechanical processes, it is possible to obtain a result comparable to that obtained with refiner in terms of workability, mechanical and aesthetic properties and corrosion behavior. The study focused on evaluating the grain growth in annealing processes after plastic deformation, also examining the casting phase and the effect of the different cooling rates. The samples, after the different thermo-mechanical treatments, were characterized in terms of microstructure, grain size and micro-hardness comparing the results with the ones of an iridium-containing alloy. The results showed that with proper optimization of annealing time is possible to obtain, without grain refiners, gold alloys with properties similar to ones obtained with Iridium as a grain refiner.

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Features of the disorder→order phase transition in non-stoichiometric Cu-56at%Au alloy

Volkov

Антонова

Glukhov

et al. 2022

Journal of Alloys and Compounds

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Influence of thermo-mechanical history on the ordering kinetics in 18 carat Au alloys

Cited by 16 publications

References 42 publications

Homogeneous and polymorphic transformations to ordered intermetallics in nanostructured Au–Cu multilayer thin films

Homogeneous and polymorphic transformations to ordered intermetallics in nanostructured Au–Cu multilayer thin films

Development of Thermomechanical Processes as an Alternative to Grain Refiners in 18 Carat Gold Alloys

Features of the disorder→order phase transition in non-stoichiometric Cu-56at%Au alloy

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