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초록· 키워드
There are solid solution strengthening, precipitation strengthening, dispersion strengthening, grain size strengthening and strain hardening in strengthening mechanism of alloys. Grain size refiners in dental casting alloys were generally high melting point platinum group metals- Ir(iridium), Ru(ruthenium), Rh(rhodium) etc. But they are shown greater segregation in casting ingot because they have relatively large atomic mass and little additional amount than other alloying elements. In this study, 75wt% Au-25wt% Ag was selected basic composition, and then 0.05wt%, 0.1wt% and 0.3wt% Rh was added to a basic composition as a grain refiner. Analytic specimen were made with diameter 5 mm and length 40 mm, and tensile test specimens were prepared with conical shoulders. To evaluate Rh effect, changes of microstructure and X-ray diffraction patterns were observed. Tensile strength and micro-Vickers hardness were also measured. In according to Rh content, percentage of dendrite was decreased and disappeared at 0.3 wt% Rh addition. From the result of X-ray diffraction, second phase was not observed. Each value of yield strength was 46.9±6.1 MPa(0.00 wt% Rh), 57.5±4.2 MPa(0.05 wt% Rh), 59.8±5.3 MPa(0.1 wt% Rh) and 66.2±6.5 MPa(0.3 wt% Rh). From these result, it was shown that yield strength, tensile strength and micro-Vickers hardness were increased with increasing Rh content. In conclusion, addition of Rh to 75wt% Au-25wt% Ag alloy improved microstructure and mechanical properties.
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UCI(KEPA) : I410-ECN-0101-2015-510-001231896
