Abstract
The controlled mother alloys, 30Pd-15Cu-55Ag(AP), 12Au-20Pd-15Cu-53Ag(APG)containing 0.03% Ir and seven kinds of alloys adding total amount of 2% Zn and/or Sn and/or In to AP and APG alloys which composition were arranged according to special cubic type in simplex lattice designs for multicomponent systems(3 components), were prepared and cast.After softening and hardening heat treatment, the mechanical properties and apparent specific gravity of the specimens were measured.The alloys adding 2% Zn to AP and APG, appeared to have a minimum tensile strength, Vickers hardness number, elastic limit and proof strength(value of strength characteristics)and maximal elongation.The alloys with 2% Sn appeared to have the maximal strength characteristics, or to show no significant difference compared with the maximum values.In(indium)had a tendency to decrease strength and elongation.No significant correlation was found between the specific gravity of as-cast specimens and value of strength characteristics of heat-treated specimens.The result indicates that the best additive for AP and APG is less than 2% Sn or 1% Sn and Zn.
