Abstract
The effect of plastic strain on the ageing kinetics of Cu-Be alloys has been studied by means of yield-stress measurements and transmission electron microscopy. The results show that plastic strain introduced before ageing retards the ageing kinetics at lower temperatures but has little effect at higher temperatures, while simultaneous straining accelerates the ageing kinetics over the entire temperature range tested (90–350°C). The retarding and stimulating effect of prior and simultaneous strain is associated with elimination and generation of excess vacancies during nonconservative motion of dislocations.
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