Effect of temperature on the continuous dynamic recrystallization of 99.99 mass% Aluminum

Abstract

The dynamic restoration process of 99.99 mass% purity aluminum has been investigated using a 〈111〉 oriented single crystal. The deformation was carried out by constant compression speed testing (at an initial strain rate of 1.67 × 10-3 s-1 at temperatures ranging from 373 to 853 K. True stress-strain curves showed gradual hardening typical of 99.99 mass% grade aluminum. The microstructure after the testing contained newly generated high angle boundaries. Continuous dynamic recrystallization was found to take place even at 373 K. High angle grain boundaries appeared at a strain of 0.28 at 453 K, while at 0.20 at 613 K. However, grains where all the surrounding boundaries have high angle boundaries were very few.