The Creep and Fracture of Polycrystalline Zinc over the Temperature Range 348-470 K

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Abstract
Constant-stress creep tests have been carried out on a zinc-0.03 at.-% silver alloy over the temperature range 348-470K in order to determine the shapes of the creep curves. The results show the creep curves to be of similar form to those observed in fcc and bcc metals. Measurements of the activation energy,activation volume, and stress-dependence of creep rate over a wide range of stress and temperature suggest that the creep rate is controlled by the rate of recovery. Changes in thestressdependence of creep rates are related to measurements of the rates of work-hardening and of recovery, using stressreduction and relaxation techniques. Fracture occurs by cavity formation at all temperatures except 470 K, at which extensive grain-boundary migration takes place. The shape of the tertiary creep curves and the measured fracture parameters are in agreement with those found in other crystal systems.

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