Abstract
Tests have been carried out on a Cu-Ag alloy containing 6·8 wt-%Ag. After the solution heat treatment the specimens were cold worked by 2·5–60% the kinetics of discontinuous precipitation at 300°,400°, and 500°C were examined. It was found that plastic deformation in the range of 2·5–30% decreases markedly the rate of discontinuous transformation; only 60% cold work increases the rate. The constants in the Johnson–Mehl equation were determined as functions of the amount of cold work and aging temperature. Examination of the isotherms of discontinuous decomposition show that at 500°C an increase takes place in the rate of the discontinuous precipitation after an incubation time. These results are explained on the basis of microstructural examinations and on microhardness and low-temperature electrical-resistance measurements.
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