Properties of Lead-Bismuth, Lead-Tin, Type Metal, and Fusible Alloys (Classic Reprint)

The experimental data show a gradual decrease of elongation with increasing bismuth content, then irregularity in the same region of the limit of solid solubility, and a final rise after the solid solubility is definitely exceeded. Elongation results on cast specimens tend to be irregular as they are in?uenced by minor imperfections in the castings to a greater degree than are either the tensile strength or hardness.

The hardness data show an increase in hardness with increasing bismuth up to about 20 per cent, followed by practically constant values from 20 to 45 per cent, with a final rise at the end of the curve. Irregularities in the region of 30 and 35 per cent are not so pronounced as in the other curves.

A few experiments on the susceptibility of these alloys to heat treat ment or to precipitation hardening were performed. Standard - inch test bars were examined in the following conditions: As cast; cast and aged at room temperature; quenched in ice water from 120 C. And pulled immediately; quenched in ice water and aged 24 hours; and annealed by heating to 1200 C. For two hours, fol lowed by slow cooling to room temperature. N 0 significant differ ences were established between the as cast and the cast and aged at room temperature specimens during periods of aging extending up to seven months. The results of the tensile strength determina tions on these heat-treated specimens are shown graphically in Fig ure 4. N o appreciable variation in results, below 35 per cent bismuth.

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