[Mechanical, physical and corrosive properties, and relative cost of a low gold content alloy (46%)]

The research presents some properties of a low gold content (46%) alloy. Mechanical properties were performed with specimens submitted to several treatment; as cast; hardened at 400 degrees C/15 min; softened at 700 degrees C/10 min; and hardened after softening. Melting temperature was considered when the alloy become a liquid sphere. Casting shrinkage determination was based on the method presented by EARNSHAW. Density was obtained by the weight of polished specimens in and out of water. Corrosion was tested at vapors of acetic acid solution, saturated with hydrogen sulfide, for a period of six months. Cost was computed on base of materials cost and density of alloy. The results showed: tensile strength and proportional limit are very high, specially when hardened and the alloy may be used for large bridges; elongation is low when alloy was heat hardened, but is good when in the as cast condition; the alloy may be handled with conventional materials and equipment; corrosion resistance is excellent; final cost is a little higher than half that of conventional gold alloy.