Effect of grain size on dynamic mechanical properties of pure aluminum

Three pure aluminum specimens with different grain sizes were obtained by the controlled heat treatment process. The stress-strain curves of the three pure aluminum specimens at 102~104 s-1 were obtained by using the split Hopkinson pressure bar technique. The yield stress and flow stress increase with the decrease of the grain size. A Hall-Petch relationship of pure aluminum under dynamic loadings was fitted out. Spall tests were performed for the three specimens by utilizing a one-stage gas gun. The results show that the grain size can hardly influence the spall properties of pure aluminum.