The Bureau of Mines investigated the precipitation strengthening of lead-base alloys containing 0.5 Through 4 weight-percent combined cd plus sb. The cd and sb were alloyed in a 1-to-1 atomic ratio which maintained compositions along the quasi-binary section pb-cdsb. Tensile properties, creep rates, and stress-rupture values were obtained on alloys in the aged condition. The highest tensile strength was observed in an alloy of pb-3 cdsb. After aging for 6 months at 90 deg. +- 3 Deg. F, this alloy had a mean tensile strength of 8,950 psi with 15-percent elongation. An aged alloy of pb-1 cdsb exhibited a steady state creep rate of 1.2 X 10-3 percent per day at a stress of 500 psi and a temperature of 90 deg. +- 3 Deg. F. Times to rupture at stresses up to 4,000 psi and at a temperature of 90 deg. +- 3 Deg. F were obtained for some compositions.
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