Abstract
The strain rate sensitivity of nominally pure polycrystalline aluminum was precisely measured using a testing system which minimized the machine transient. The strain rate sensitivity vs temperature relation was determined over three decades of strain rate in the temperature range 247–333 K. The scatter in the averaged values was small enough that steps or plateaus in the ascending curve could be detected. The activation energy of 0.53 eV for the initial step is comparable to that of vacancy or divacancy migration. The increasing trend of strain rate sensitivity with temperature and the observed plateaus can be explained if a two obstacle model of discrete barriers is invoked whereby the recovery of the weaker one affects the force-distance relation of the stronger obstacle.
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