Tempering/ageing in region 50 – 600 °C of quenched and cold deformed 585 GOLD alloy for jewelry production

Numerous gold alloys posses the ability for thermal hardening, and this property is attractive for improving jewels strength, because the most noble alloys are weak. The thermal treating below the recrystallization temperature, is kind of tempering but also age-hardening. In this paper is made an attempt for studying the possibility for thermal hardening of 585 golden alloy. The goal is to increase the mechanical properties. Those demands could be reached by metallurgical controlling of phase transformations аnd proper thermal treating. Here is studied behavior of quenched and cold deformed gold alloy 585 after tempering/ageing in temperature region 50 - 600 °C, in intervals of 50 °C. The highest hardness values are obtained at temperatures about 200 °C for both initial states

THE AGE-HARDENING MECHANISM OF Au585Ag90Cu264Zn61 GOLD ALLOY FOR JEWELRY PRODUCTION

The researches in this paper are conducted on Au585Ag90Cu264Zn61 gold alloy for jewelry production by plasic processing. Jewelry manufacturing, in contemporary goldsmith industry, beside modern design and great appearance, also demands great mechanical and technical and technological properties. In ternary alloys of Au-Ag-Cu system, structural changes happens, but not yet inestigated enough, both in alloys and in different stages of processing. In this paper, beside theoretical explanation of hardening mechanism by annealing on temperatures below the recrystallization temperatre that is by aging, the results obtained by annealing are also presented

Investigation of mechanicaland structural characteristics of some alloys in Ag-rich corner of Ag-Cu-Sn system

Results of investigation of mechanical and structural characteristics of some Ag-rich alloys in Ag- Cu-Sn system are presented in this paper. Starting samples were four small billets with different contents of constituting elements - Ag90Cu5Sn5, Ag85Cu5Sn10, Ag85Cu10Sn5, Ag80Cu10Sn10 (at%), prepared from p.a. metals Sn, Ag, Cu by melting in electro-inductive furnace under air atmosphere and additional reductant and cast into bars of square shape, dimensions 1x1x10cm. Mechanical characteristics, such as hardness and microhardness, electroconductivity and microstructure, were observed before and after a series of passes through a grooved roll stand (cold rolling)

THE AGE-HARDENING MECHANISM OF Au585Ag90Cu264Zn61 GOLD ALLOY FOR JEWELRY PRODUCTION

The researches in this paper are conducted on Au585Ag90Cu264Zn61 gold alloy for jewelry production by plasic processing. Jewelry manufacturing, in contemporary goldsmith industry, beside modern design and great appearance, also demands great mechanical and technical and technological properties. In ternary alloys of Au-Ag-Cu system, structural changes happens, but not yet inestigated enough, both in alloys and in different stages of processing. In this paper, beside theoretical explanation of hardening mechanism by annealing on temperatures below the recrystallization temperatre that is by aging, the results obtained by annealing are also presented