Effects of small additions of lead,sulphur and oxygen on annealing characteristics of cold-drawn pure copper |
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Authors: | S Aoyama M Kanno |
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Affiliation: | (1) Power System Laboratory, Hitachi Cable Ltd, 4-10-1 Kawajiri, 319-14 Hitachi, Japan;(2) Department of Materials Science, Faculty of Engineering, The University of Tokyo, 113 Tokyo, Japan |
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Abstract: | Softening of cold-drawn wires of a tough pitch copper containing a small amount of lead as well as oxygen and sulphur is enhanced when hot-rolled rods of the copper are heated at 600 °C before cold-drawing. Enhancement causes were examined using wires of pure Cu, Cu-O, Cu-S, Cu-Pb, Cu-Pb-O, Cu-Pb-S, Cu-Pb-S-O. The softening enhancement appearing in the Cu-Pb-S-O specimen was attributed to the decrease in the amount of dissolved Pb and S in the copper matrix due to precipitation during heating at 600 °C. The addition of lead in the presence of oxygen was shown to decrease the solid solubilities of S in the copper matrix. |
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