Investigation of supersaturated silver alloys for high hardness jewelry application
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Sterling silver is one of the most widely used precious metal alloys in jewelry industry. 92.5 wt% silver content is the standard for sterling products, while 7.5 wt% is reserved for other alloying elements. Because the mechanical properties of pure silver such as yield strength and hardness are extremely low. In the bounds of 7.5 wt% solute addition, different approaches have been introduced in order to improve the properties of sterling silver. For example, to increase the hardness of the jewelry pieces, metallurgists introduced age hardening, cold working, and surface treatments. We reported on the trend of intrinsic hardness increase of the alloyed silver matrix and possibilities to supersaturate the silver matrix by different alloying elements. Relationship between the hardness increase and ability for each solute species to distort the mean lattice parameters as functions of solute percent increase (at%) had been identified. Similar trends were observed for supersaturation and Lindeman-like melting behaviors. When solutes were added to the lattice, the lattice distortion was inevitable. Once the distortion exceeded a certain threshold, the lattice collapsed and led to a local melting event. When comparing with the solute addition (at%) our findings confirmed the same trends for the supersaturation rate (dCcritical/d?), the mean lattice distortion rate (dLkhl/d?), the increase rate in microvickers hardness (dHv/d?), and the Lindeman melting behavior particularly the rate of drop in solidus temperatures (dTsolidus/d?).Downloads
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Nisaratanaporn, S., & Nisaratanaporn, E. (2003). The Anti-tarnishing, Microstructure analysis and Mechanical properties of Sterling silver with silicon addition. Journal of Metals, Materials and Minerals. 12(2): 13-18.
Niedderer, K., Harrison, C., & Johns, P. (2006). Exploring the creative possibilities of Argentium® Sterling Silver. WonderGround. Lisbon, Portugal: IADE.
Głuchowski, W., & Rdzawski, Z. (2008). Silver– mishmetal alloy for application at elevated temperature. Journal of Achievements in Materials and Manufacturing Engineering. 26(2) : 123-126.
Olesinski, R. W., Gokhale, A. B., & Abbaschian, G. J. (1989). The Ag-Si (Silver-Silicon) system. Journal of Phase Equilibria. 10(6) :635-640.
Fischer-Bühner, J. (2007). Advances in the prevention of investment casting defects assisted by computer simulation. In The Santa Fe Symposium on Jewelry Manufacturing Technology. 149-172.
Chanmuang, C., Kongmuang, W., Pearce, J. T. H., & Chairuangsri, T. (2012). Influence of casting techniques on hardness, tarnish behavior and microstructure of Ag-Cu-ZnSi sterling silver jewelry alloys. Journal of Metals, Materials and Minerals. 22(2): 19-26.
Colombo, S., Battaini, P., & Airoldi, G. (2007). Precipitation kinetics in Ag–7.5 wt.% Cu alloy studied by isothermal DSC and electrical-resistance measurements. Journal of alloys and compounds. 437(1): 107-112.
Johns, P.G. (2008). Process for making finished or semi-finished articles of silver alloy comprising copper and germanium. UK Patent. GB 2414739.
Hume-Rothery, W., Lewin, G. F., & Reynolds, P. W. (1936). The lattice spacings of certain primary solid solutions in silver and copper. Proceedings of the Royal Society of London. Series A-Mathematical and Physical Sciences. 157(890) : 167-183.
Nisaratanaporn, E., Wongsriruksa, S., Pongsukitwat, S., & Lothongkum, G. (2007). Study on the microstructure, mechanical properties, tarnish and corrosion resistance of sterling silver alloyed with manganese. Materials Science and Engineering: A. 445: 663-668.
Stillinger, F. H. (1995). A topographic view of supercooled liquids and glass formation. Science. 267(5206) : 1935-1939.
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